# Matlab Magnitude Of Vector

Scribd is the world's largest social reading and publishing site. We give some of the basic properties of dot products and define orthogonal vectors and show how to use the dot product to determine if two vectors are orthogonal. Cody is a MATLAB problem-solving game that challenges you to expand your knowledge. This is the number of actual objects held in the vector, which is not necessarily equal to its storage capacity. MATLAB/SIMULINK MODEL OF SPACE VECTOR PWM FOR THREE-PHASE VOLTAGE SOURCE INVERTER Atif Iqbal(1) Adoum Lamine(2) Imtiaz Ashraf(1) Mohibullah(1). The MATLAB's quiver command automatically scales the size of the arrow heads according to the magnitude of the vector. Transmitter. The program also plots the DFT magnitude as a function of the Matlab array index and as a. Seven examples of grouped, stacked, overlaid, and colored bar charts. You saw above how to convert a point to a vector. re 2 + pSrc [ n ]. Laplace Transform Example #1. This file codes the vector field for the problem as a matLab function. mag2(vector(1,1,1)) # = 3, the magnitude squared. Applications of the dot product will be shown. There are several operations you can perform with vectors which don't make a lot of sense with other arrays such as matrices. I do have isinf = nan code, just incase. 2 Signal Amplitude, Magnitude, Power. The frequency response of our Chebyshev filter is given by H(ω) = e jωn (b 1 + b 2 e -jω - b 3 e -2jω)/ e jωn (a 1 + a 2 e -jω + a 3 e -2jω). This produces a. Thanks for any help. 1: How to change the Matlab current directory 7. From physics we know W=Fd where F is the magnitude of the force moving the particle and d is the distance between the two points. I saw another question Link where thery recommend to use HSV but I'd like to see the orientation with quiver jointly with the magnitude as a heat map. Three dimensional vectors have length. A (nonzero) vector is a directed line segment drawn from a point P (called. Transmitter. of Kansas Dept. Suppose that you're given the coordinates of the end of the vector and want to find its. 4 CircStat: A MATLAB Toolbox for Circular Statistics 2. When you plot a complex vector in MATLAB, it tries to plot the real part against the imaginary part, which is not what we want to do. Syntax Examples. Magnitude is defined as the length of a vector. Frequency vector and fft. Scalar-vector multiplication Online calculator. Thus the variance of the Gaussian pdf is $$\sigma^2=4$$. These matrices play a fundamental role in many numerical methods. If a vector is an exact eigenvector of a matrix , then it is easy to determine the value of the associated eigenvalue: simply take the ratio of a component of and , for any index that you like. If you pass multiple complex arguments to plot, such as plot(z1,z2), then MATLAB® ignores the imaginary parts of the inputs and plots the real parts. 2808; % conversion. Vectors In MATLAB a vector is a matrix with either one row or one column. Learn more about matlab, simulink, norm, vector, normalization, magnitude. More formally, an object's magnitude is the displayed result of an ordering (or ranking) of the class of objects to which it belongs. Graph shows the magnitude. I want the color of each arrow in a quiver3 plot from MATLAB to correspond to the magnitude of each arrow. X- and Y-Components of a Force Vector. Problem Statement Present an Octave (or MATLAB) example using the discrete Fourier transform (DFT). how could I. If the coordinates of the initial point and the end point of a vector is given, the Distance Formula can be used to find its. Active 2 years, 11 months ago. You need to take the following steps to calculate the magnitude of a vector − Take the product of the vector with itself, using array multiplication (. Note also the fftshift I used in the plot. It is length times orthogonal length. Short Circuit Fault Analysis of Electrical Power System using MATLAB - Free download as PDF File (. Length of vector. If A is a multidimensional array, then vecnorm returns the norm along the first array dimension whose size does not equal 1. –The magnitude of a vector is = 𝑇 = 𝑑 =1 1 2 –The orthogonal projection of vector onto vector is 𝑇 •where vector has unit magnitude and the same direction as –The angle between vectors and is 𝜃= , –Two vectors and are said to be. For example, assume you’re looking for a hotel that’s 20. Distance is a scalar ("3 km") Displacement is a vector ("3 km Southeast") You can walk a long distance, but your displacement may be small (or zero if you return to the start). Stopband weights = Wstop = 60. *v; Use the sum function to get the sum of squares of elements of vector v. For example, assume you're looking for a hotel that's 20. According to vector algebra, a vector can be added to the other vector. The valid values of p and what they return depend on whether the first input to norm is a matrix or vector, as shown in the table. Is there any way to do that? I saw a few examples online that are able to do this for th. Magnitude of a Vector. Vector data models use points and their associated X, Y coordinate pairs to represent the vertices of spatial features, much as if they were being drawn on a map by hand (Aronoff 1989). How to Find Vector Length in MATLAB Without Using Any MATLAB Functions? How would I be able to find the length of a vector only using simple arithmetic and loops? For example, I can't use functions like find(), length(), fft(), etc. Matlab - Essential Training. Audio Processing in Matlab Matlab is widely used environment for signal processing and analysis. You saw above how to convert a point to a vector. To plot this surface one uses the MATLAB commands: sig =linspace(-6,2,100); omeg. If A is a row vector, then fliplr(A) returns a vector of the same length with the order of its elements reversed. y = db2mag(ydb) returns the magnitude measurements, y, that correspond to the decibel (dB) values specified in ydb. (b) The phase angle as a function of frequency for the range 10 kHz to 10 MHz. Often for loops can be eliminated using Matlab’s vectorized addressing. Input array, specified as a scalar, vector, matrix, or multidimensional array. The vector triple product identity is also known as the BAC-CAB identity, and can be written in the form. In vector addition, the zero vector is the additive identity vector: v + O = v. There are theoretical reasons why the cross product (as an orthogonal vector) is only available in 0, 1, 3 or 7 dimensions. In mathematical terms, this process is written as: Definition: A unit vector is a vector of magnitude 1. Length of vector. However, when your data is a matrix, MATLAB performs calculations independently for each column. Basic Vector Operations Both a magnitude and a direction must be specified for a vector quantity, in contrast to a scalar quantity which can be quantified with just a number. A (nonzero) vector is a directed line segment drawn from a point P (called. Unit vectors can be used to express the direction of a vector independent of its magnitude. As for scaling the x-axis to be in Hertz, just create a vector with the same number of points as your FFT result and with a linear increment from $-fs/2$ to $+fs/2$. Try the same symbolic command with sin(a), erf(a) and check against the numerically valued functions or the quick plot. Let us have a detailed discussion of vector math with its definition, representation, magnitude and its operations. This simple vector algebra calculator uses the three-dimensional magnitude of a vector formula to compute the results in a reliable manner. The magnitude of the vector v = 6 i + 2 j+ 3 k. The magnitude of this vector (if it describes a position in euclidean space) is equal to the distance from the origin: $$(v^Tv)^{\frac{1}{2}} = \sqrt{(v^Tv)}$$ that is, the square root of the dot product. the evolution of the angular velocity vector in the body frame, and the second step is to solve for the orientation. “A” and “B” are the horizontal and vertical components of the triangle while “C” is the hypotenuse. A scalar field is a value that is attached to every point in the domain, temperature is a simple example of this. An email has been sent to verify your new profile. m function m = See full answer below. This is an example of vectorization, i. BASIC MATLAB INTERFACE 37 function [m,theta] = vector(x) m=abs(x); %Use the native function abs. m: % % Filename: example5. Cody is a MATLAB problem-solving game that challenges you to expand your knowledge. In the past we’ve used the fact that the derivative of a function was the slope of the tangent line. The reason f(x) works. The matrix version of the equation has its own geometric interpretation. A very common way of storing data is in a matrix, which is basically a two-way generalization of a vector. Ask Question Asked 2 years, 11 months ago. Calculating the magnitude of vectors is essential for all sorts of problems where forces collide. im 2 ) 1/2 The real flavor of the function ippsMagnitude computes the element-wise magnitude of the complex vector whose real and imaginary components are specified in the vectors pSrcRe and pSrcIm , respectively, and stores the result in pDst. In this module you’ll write small pieces of code to extend your analysis. MATLAB Answers. To perform scalar multiplication, you need to multiply the scalar by each component of the vector. Both the operand vectors must be of same type and have same number of elements. Matlab provides the function fminunc to solve unconstrained optimization problems. pdf), Text File (. Video created by MathWorks for the course "Exploratory Data Analysis with MATLAB". This is also called. Transmitter. The size and data type of the output array is the same as the input array. We can calculate the magnitude and phase angle element by element using abs and angle command, but I want to find out the overall magnitude and phase angle of a complex vector like [1+2*j 2+0. (b) Use the two vectors in a MATLAB command to create a 3 × 4 matrix such that the first column consists of elements 2 through 4 of vector a, the second column consists of elements 4 through 6 of. Multiply by a constant: Make an existing vector stronger (in the same direction). The Octave interpreter can be run in GUI mode, as a console, or invoked as part of a shell script. To normalize a vector, divide the vector by its magnitude. m: A test program for the program 'nBodyWpar. if 'r' is a vector. More from this Author 1. y = linspace(a,b,n) generates a row vector y of n points linearly spaced. Thanks for any help. Matlab has no “dft” function, as the FFT computes the DFT exactly. A "scalar" is a simple quantity that just has a value, such as temperature or speed. Rearrange the Pythagorean theorem to calculate the magnitude. Eigenvalues and Eigenvectors 6. Vectors In MATLAB a vector is a matrix with either one row or one column. If you have no previous experience with Matlab, it would be beneficial to go through some of the tutorials provided in the Matlab documentation. z = exp(j*w*T); % Compute magnitude and phase for frequency response using "dbode". The Rayleigh Quotient. For positive integers: a=A(:); % make A a row b=B(:);. In this work, support vector regression with two different kernel types namely, the linear kernel and sigmoid kernel, has been utilized for the calculation of the Lyapunov exponents of the given time series. 3 Transpose Operation for Complex Vectors. The vector has an infinite magnitude with real number components. subscribe - Become subscribing user of MATLAB. The accelerometer is connected to MATLAB لغات کلیدی: arduino, Visualization, Accelerometer, Matlab, Arduino, Arduino UNO, Vector, Magnitude, USB, Serial Port, Electronics, Technology, Physics, Gravity. For example, take a look at the vector in the image. And to find you use the inverse tangent function (or inverse sine or cosine). Surface Integrals of Vector Fields. To calculate the magnitude of two matrices it is the same procedure as with scalar values. For the case of a pure sinusoidal input, the magnitude spectra of the successive spectra are the same (as shown). In mathematics, magnitude is the size of a mathematical object, a property which determines whether the object is larger or smaller than other objects of the same kind. This is also called. Matlab Code that takes a 1x3 matrix as input and computes two outputs: the magnitude and the unit vector (as a 1x3 matrix): %MAG_UV. Whereas some MATLAB functions support only vector inputs, others accept matrices. Finally the EVM of a Test Model (E-TM) signal is measured, showing how to synchronize an E-TM signal that has been generated outside of MATLAB® or that has been played over-the-air after being generated inside MATLAB. General information: info - Information about MATLAB and The MathWorks, Inc. Learn more about matlab, simulink, norm, vector, normalization, magnitude. A geometric object which has those features is an arrow, which in elementary geometry is called a “directed line segment”. In symbols the magnitude of P Q → is written as | P Q → |. It is interoperable with another matrix program called MatLab, that is, the commands in Octave and MatLab are the same or very similar. The syntax is: save filename. In mathematics, magnitude is the size of a mathematical object, a property which determines whether the object is larger or smaller than other objects of the same kind. Notice that we can and should make a distinction in Maple bewteen the pointwith coordinates (x,y,z) and the vectorwith components x,y,z>. Basic Vector Operations Both a magnitude and a direction must be specified for a vector quantity, in contrast to a scalar quantity which can be quantified with just a number. MATLAB Tutorial Aly El-Osery October 27, 2004 This tutorial is meant to be a quick start to get used to MATLAB. Let the force vector be F=<2,3,4> and the displacement vector be d=<1,2,3>. Learn more about for loop. Passband weights = Wpass = 1. Aliasing occurs when you don't sample a signal fast enough to be able to reconstruct it accurately after sampling. There are several operations you can perform with vectors which don't make a lot of sense with other arrays such as matrices. start() doc help -i % browse with Info: Browse help interactively: help() help help or doc doc: Help on using help: help(plot. Magnitude and direction of vectors. When this scalar (magnitude) is multiplied by a unit vector in the coordinate direction, the result is the vector component in that coordinate direction. We also write as a shorthand for the vector's n-tuple. A scalar field is a value that is attached to every point in the domain, temperature is a simple example of this. As far as I aware there is no function doing this for you. *v; Use the sum function to get the sum of squares of elements of vector v. This is the motivation for how we will deﬁne a vector. min Returns smallest element. MATLAB Answers. You saw above how to convert a point to a vector. Whereas some MATLAB functions support only vector inputs, others accept matrices. Features and How to Extract Them in MatLab The nal task for our image processing system will be to take an object region in an image and classify it (thereby \recognizing" it). In this article we’ll discuss and show the Matlab built-in commands ' compass ', ' polar ' and ' rose '. Vector Addition / Subtraction, given vector components; Be sure to use negative signs for any values that are in the opposite direction. Bar Charts in MATLAB ®. You da real mvps! $1 per month helps!! :) https://www. Matlab is a software package that makes it easier for you to enter matrices and vectors, and manipulate them. subscribe - Become subscribing user of MATLAB. This produces a vector sv, whose elements are squares of the elements of vector v. The only difference is that before the power operator you have to put a point (. The proportionality factor turns out to be the sampling period. The formula is about the same as for two dimensional vectors. A unit vector is one which has a magnitude of 1 and is often indicated by putting a hat (or circumflex) on top of the vector symbol, for example: Unit Vector = â, â = 1. Basically, data is shared between variables whenever possible, and a true copy is made only when one of the variables is modified. Magnitude of the vector's horizontal component: Magnitude of the vector's vertical component. A seed is located at the centroid of element with the maximum magnitude of the Load Path Vector selected for the plot. Suppose that we know the Cartesian coordinates, , , and , of this body as time, , progresses. The size and data type of the output array is the same as the input array. Thanks for any help. An email has been sent to verify your new profile. Eigenvalueshave theirgreatest importance in dynamic problems. Instead, it's the period from 0 to. Please fill out all required fields before submitting your information. This tutorial course will show you step-by-step how to use the power of Matlab! We'll begin with the essential topics and work our way though algebra, calculus, plotting, programming, and more!. Angle between vectors. Testing the characteristics of White Gaussian Noise in Matlab: Generate a Gaussian white noise signal of length $$L=100,000$$ using the randn function in Matlab and plot it. 5 times a unit vector. A matrix is a two-dimensional array of real or complex numbers. Finding the Frequency Response Using Matlab. To use this calculator enter the magnitude and direction of the first and second vectors. Return the largest number that is adjacent to a zero. doc 2/3 Jim Stiles The Univ. So, for example, if a gradient vector has an angle of 85 degrees, then we add 1/4th of its magnitude to the bin centered at 70 degrees, and 3/4ths of its magnitude to the bin centered at 90. But suppose is only an approximate eigenvector, or worse yet, just a wild guess. The point cloud data is then discretized. Open Mobile Search How can I compute resultant velocity vector and magnitude from a 3D time-series of water flow? rotate the time-series and. They used HOG in human detection as a test case for their experiments. The distinction between row vectors and column vectors is essential. If I have : a=magic(9); How do I compute the direction and magnitude of vectors between any two points in a? For example if I define vec = [a(1,1) a(2,2)], would the direction of the vector be de Stack Overflow. The vector triple product identity is also known as the BAC-CAB identity, and can be written in the form. • The Fourier Series coefficients can be expressed in terms of magnitude and phase – Magnitude is independent of time (phase) shifts of x(t) – The magnitude squared of a given Fourier Series coefficient corresponds to the power present at the corresponding frequency • The Fourier Transform was briefly introduced. For example, try. The vector whose initial and terminal points are both is the zero vector, denoted by O, or 0, 0 >. temperature or pressure). 3-1 for the geometric interpretation of scalar multiplication of a vector in three dimensional space. The vectors are given in three-dimensional space. Vector Calculus: grad div and curl. m Section 41: Integer Operands Are Required for Colon Operator When Used as Index Warning: Integer operands are required for colon operator when used as index. Basic Vector Operations : We write vectors in Mathematica as a list of components. It is by far not comprehensive. To explain the MATLAB output we're looking at, let me show a DTFT magnitude plot that shows three periods instead of just one. The magnitude of the current is 0. How to interpret FFT results – obtaining magnitude and phase information June 20, 2019 November 19, 2015 by Mathuranathan ( 90 votes, average: 4. More specifically, using Norm doesn't seem to simplify trigonometric results unless the t is substituted. Even those examples don’t explore the extend of the. A vector is an object that has both a magnitude and a direction. If X is complex, then it must be a single or double array. When we check our thesaurus, we find that they are synonymous. linspace Creates regularly spaced vector. Whereas some MATLAB functions support only vector inputs, others accept matrices. To produce a vector of these probabilities we can use the MATLAB cumsum function, which creates a new vector in which each element is the cumulative sum of all the elements up to and including the comparable position in the original vector. Consider the vectors (written in Carte-sian coordinates as. For the case of a pure sinusoidal input, the magnitude spectra of the successive spectra are the same (as shown). Data can be stored as variables, which can then be saved to memory. Similarly we can take the surface integral of a vector field. Hence the magnitude response is a monotonically decreasing functionof w from w = 0 to w = π. And watch out for these special words: Distance vs Displacement. From physics we know W=Fd where F is the magnitude of the force moving the particle and d is the distance between the two points. The distinction between row vectors and column vectors is essential. MATLAB Vector: Size, Magnitude, and Sum Get the Size (i. A vector can be "scaled" off the unit vector. Maths Geometry Graph plot vector The demo above allows you to enter up to three vectors in the form (x,y,z). Seeds are created on other elements with the same coordinate (in the Load Path Vector direction) to form a rake. is equivalent to the matrix equation. The length of the line shows its magnitude and the arrowhead points in the direction. Vectors In MATLAB a vector is a matrix with either one row or one column. In physics, sometimes you have to find the angle and magnitude of a vector rather than the components. It is a scalar and must be non-negative. So although MATLAB's calling convention appears to be pass-by-value, if you don't modify the input variables, the data is never copied. Linear algebra includes matrix arithmetic, linear equations, eigenvalues, singular values, and matrix factorizations. The vectors are given in three-dimensional space. Wind, for example, had both a speed and a direction and, hence, is conveniently expressed as a vector. OutputSel defaults to all components. Taking the dot product of an arbitrary vector with a unit vector oriented along a coordinate direction yields the projection of the arbitrary vector along the coordinate axis. This is also called the. Fifth: That magnitude is a scalar, since we summed the vector. First Edition: April 2006. Is there any way to do that? I saw a few examples online that are able to do this for th. In MATLAB there are currently two types of glyph available: the cone or the arrow. m function m = See full answer below. There are several operations you can perform with vectors which don't make a lot of sense with other arrays such as matrices. The interface follows a language that is designed to look a lot like the notation use in linear algebra. As for scaling the x-axis to be in Hertz, just create a vector with the same number of points as your FFT result and with a linear increment from$-fs/2$to$+fs/2\$. This means that when you pass a matrix. where P is a vector containing the poles of the transfer function, R is a vector containing the coeficients (residues) associated with the poles, and K is the direct feedthrough term from input to output. 1 Vector magnitude. To use this calculator enter the magnitude and direction of the first and second vectors. , R 21 21=Raˆ )! For example, since the direction of directed distance R 21 is equal to ˆ a 21, we can explicitly find this unit vector by. How can I calculate the magnitude of Learn more about vector, magnitude the magnitude of n-dimensional vector by Matlab's commands? the magnitude of n. This chapter enters a. Wind, for example, had both a speed and a direction and, hence, is conveniently expressed as a vector. For example, take a look at the vector in the image. Suppose this is not the case. If X is a scalar and Y is a vector, disconnected line objects are created and plotted as discrete points vertically at X. The magnitude of the current is 0. If I have : a=magic(9); How do I compute the direction and magnitude of vectors between any two points in a? For example if I define vec = [a(1,1) a(2,2)], would the direction of the vector be de Stack Overflow. Unit vectors can be used to express the direction of a vector independent of its magnitude. If you pass multiple complex arguments to plot, such as plot(z1,z2), then MATLAB® ignores the imaginary parts of the inputs and plots the real parts. The syntax is: save filename. If you're given the vector components, such as (3, 4), you can convert it easily to the magnitude/angle way of expressing vectors using trigonometry. Starting and quitting from MATLAB: quit - Terminate MATLAB. I want the color of each arrow in a quiver3 plot from MATLAB to correspond to the magnitude of each arrow. I want the color of each arrow in a quiver3 plot from MATLAB to correspond to the magnitude of each arrow. If you are using a version of MATLAB prior to version 7. putting several numbers into a vector and treating the vector all at once, rather than one component at a time, and is one of the strengths of Matlab. They can be used to explore and summarize important properties of a sample of angular data such as central tendency, spread. 165 Solvers. Distance is a scalar ("3 km") Displacement is a vector ("3 km Southeast") You can walk a long distance, but your displacement may be small (or zero if you return to the start). Is there any way to do that? I saw a few examples online that are able to do this for th. The only correct answer is that we. where P is a vector containing the poles of the transfer function, R is a vector containing the coeficients (residues) associated with the poles, and K is the direct feedthrough term from input to output. Basic Vector Operations : We write vectors in Mathematica as a list of components. 1:5; Most of the work you will do in MATLAB will be stored in files called scripts,orm‐files, containing sequences of MATLAB commands to be executed overand overagain 17. Keeping this slow down due to the interpretive nature of Matlab in mind, one programming construct that should be avoided at all costs is the for loop, especially nested for loops since these can make a Matlab programs run time orders of magnitude longer than may be needed. linspace Creates regularly spaced vector. Wind, for example, had both a speed and a direction and, hence, is conveniently expressed as a vector. Find the sum of all the numbers of the input vector. Consider the plane wave travelling in the +z-direction, with E-field described by equation (4): The locus of points that the tip of the E-field vector would assume is given in Figure 5. The Complex to Magnitude-Angle block outputs the magnitude and/or phase angle of the input signal, depending on the setting of the Output parameter. In symbols the magnitude of P Q → is written as | P Q → |. matlabrc - Master startup M-file. The Pythagorean theorem is A2 + B2 = C2. I saw another question Link where thery recommend to use HSV but I'd like to see the orientation with quiver jointly with the magnitude as a heat map. I'd like to plot a vector field with its orientation(I already know quiver could help) and jointly with its magnitude as a color plot. The primary MATLAB function for creating oriented glyph visualizations is coneplot. Defining a Vector¶. Whereas some MATLAB functions support only vector inputs, others accept matrices. If you only want to transpose a complex vector then use the MATLAB function transpose or the non-conjugate transpose. This free online calculator help you to find magnitude of a vector. If X or Y is a matrix, then the vector is plotted versus the rows or columns of the matrix, whichever line up. Input array, specified as a scalar, vector, matrix, or multidimensional array. In most cases where we deﬁne signals using vectors we are interested in multiplying these. (Notice that the second command has a ”;” at the end of the line. Let's concentrate on finding the directional derivative at the point (1,1) in the direction of the vector vec v=langle 1, 1 rangle. 101 RMC [ 3]. Every nonzero vector has a corresponding unit vector, which has the same direction as that vector but a magnitude of 1. The fact that magnitude occurs for both scalars and vectors can lead to some confusion. You saw above how to convert a point to a vector. This MATLAB function returns the measured root-mean-square EVM, RMSEVM, of the received signal RXSYM, based on reference signal REFSYM. QUIVER_SCALE(U,V,S) or QUIVER_SCALE(X,Y,U,V,S) automatically scales the arrows to fit within the grid and then stretches them by S. This function set will perform S-Parameter conversions of units and also for impedance change of the measurement system or DUT. EE341 EXAMPLE 5: PLOTTING TRUNCATED FOURIER SERIES REPRESENTATION AND SPECTRA OF A SIGNAL Matlab m-file example5. Features and How to Extract Them in MatLab The nal task for our image processing system will be to take an object region in an image and classify it (thereby \recognizing" it). A negative vector has the same magnitude but the opposite direction. Let ( 1)( 3) 1 ( ) + + = s s G s. Back Trigonometry Vectors Forces Physics Contents Index Home. |v| = √(v1 2 + v2 2 + v3 2 + … + vn 2) You need to take the following steps to calculate the magnitude of a vector − Take the product of the vector with itself, using array multiplication (. In Matlab you must define the vector bb needed in filter( ). The column vector y is considered to be a 4×1 matrix. Vector Indexing, or vector index notation, specifies elements within a vector. *v; Use the sum function to get the sum of squares of elements of vector v. pdf), Text File (. Thanks for any help. Unit vectors can be used to express the direction of a vector independent of its magnitude. Matlab Sect 9 Calculating the Vector Dot Product and Cross Product - Duration: 8:48. However, in Matlab, if you type in a vector in a form like [4 3 2 1], it is entered as a row vector (because you might have been entering the first row of a matrix). Use the MATLAB routines grid to put up some grid lines on the graph, and hold to hold the graph and not erase it when you plot a second draft.