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Preallocating an array or a vector in matlab before a for loop
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Preallocating an array or a vector in matlab before a for loop
N = 24 ; sigma_infty = zeros(6,N); eps_infty = zeros(6,N); for k = 1:N % sigma_infty(:,k) = [10*k 0 0 0 0 0]'; ...

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im modelling for two mass drive train , i could not able to know why an index exceed error
function dy= two_mass2(ta,te,k,d,jt,jg,y) x=y(1); y=y(2); dxdt=y(3); dydt=y(4); d2xdt2=((1./jt)*(ta-d*(dxdt-d*dydt)-k*(x-y)...

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How to compare each element of two arrays fullfilling a set condition more efficiently / quickly?
A = randi([0,5],10,1); B = randi([0,5],10,1); err = 0.5; [a,b] = meshgrid(A,B) ; idx = a<(1+err)*b & a>(1-err)*b ; r...

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Build arrays under the for loop
R = cell(10,1) ; for i=1:10 R{i}= nonzeros(D(i,:)); end You can access by R{1},R{2},...R{10}. R is a cell array. You ...

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How to exclude/extract empty rows/columns in a table?
T = readtable('https://in.mathworks.com/matlabcentral/answers/uploaded_files/1288860/test_file.txt'); % Remove empty rows idx...

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Error using tf The values of the "Numerator" and "Denominator" properties must be row vectors or cell arrays of row vectors,
Your numerator and denominator are sym class. You need to convert them to double using double. sys = tf(double(numerator) , dou...

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How do I input names properly in a script?
height=input('enter your height in feet:'); weight=input('enter your weight in pounds:'); name=input('enter your first name:',...

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how to convert a.mat file in to png?
Read about volumeViewer load('dataset_liver_bmodes_steatosis_assessment_IJCARS.mat') I = data(1).images ; volumeViewer(I)

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How to convert symbolic output to numeric value in Symbolic Math Toolbox?
Read about double, vpasolve.

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Animate a line in polar coordinates
In your case r is comlex number which is not allowed. You need to get r as shown below. theta = 0:0.001:2*pi; R = 1 ; x = R...

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How to discretize the color in contour bar at smallest possible range?
% Make data for demo [X,Y,Z] = peaks ; vals = [0.000 0.005; 0.005 0.009 ; 0.01 0.05 ; 0.05 0.1; ...

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How to plot the graph for a given signal over a range of frequency
w = [0 pi/8 pi/4 pi/2 pi] ; n = 1 ; x = cos(w*n) ; plot(w,x)

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How to convert cell char array in Table With Column
You can use regexp to extract the data. load('Data.mat') [m,n] = size(Datawebsite) ; predictedClass = cell(m,1) ; maximum...

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Using masking and native string functions to find the longest word in a string.
str = 'Today is a good day' ; s = strsplit(str) ; L = cellfun(@length,s) ; [val,idx] = max(L) ; longest_string = s{idx} ; f...

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Maximum perpendicular distance between lines
You have to use the foot of the perpendicular formula. clc; clear all ; x = [120 150 180 210 240 270 300 330 ...

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Indexing in complex cell arrays
% Make dummy data for demo a = cell(10,1) ; for i = 1:10 m = randsample(5:10,1) ; b = cell(m,1) ; for j = 1:m...

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Generate a Random Point inside a box/plane
A = [0 0] ; % (p,q) B = [1 1] ; % (x,y) a = 50; b = 100; r = (b-a).*rand(1000,1) + a; x = (B(1)-A(1))*rand(100,1)+A(1) ; ...

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How to plot This graph in matlab?
I have shown one plot for you reference. You may extend the same to others. x=1.0:0.1:3.0; y=-2.03*10^-3*x.^2+5.76*10^-3*x+1*...

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Expected a scalar value. This expression has size [:? x 1].
Try this: % Sample Code tol = 10^-3 ; % can be changed idx = find(abs(sample.data1-values)<tol) ; max_index = idx(1) ;

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Fisher Discriminant analysis - issues with classes
You should use: % Compute mean of each class mu = zeros(k,C); % k = 3 i.e. number rows and C is number of classes i.e.5 for...

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How to check whether point is inside high dimensional convex hull?
This link should help you: https://in.mathworks.com/matlabcentral/answers/101396-is-there-a-function-in-matlab-for-detecting-poi...

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Extract area of matrices (lat, lon, data) by shapefile. "Requested array exceeds the maximum possible variable size."
You need not to use meshgrid. Already your lon, lat values are in meshgrid. Remove these lines: lat = %MyLat 8000x8192; lon = ...

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extractin values from a struct that is in a table
rain = data.rain ; iwant = zeros(length(rain),1) ; for i = 1:length(rain) if ~isempty(rain{i}) iwant(i) = rain{...

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Find unknowns from inequations
Read about linprog

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How to find first 10 minimum values in a table array?
You can sort the array you want and arrange the other arrays/ table into that order. You can pick the first whatever number you ...

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How do I plot values taken from a for loop function?
clc B0=-0.00356616 ; %Lapse Rate T0=518.67 ; B=B0 ; %Lapse Rate a=0.1:36089.2 ; %Altutude in ft T...

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A general question about syntax regarding an Excel file's rows and columns in MATLAB
T = readtable(file,'HeaderLines',1) ; data = table2array(T) ; m = mean(data) [SL: fixed typo]

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Filling area common to two inequalities?
clc; clear all; E11=0.041057; E12=-0.117734; E21=0.029952; E22=-0.042564; A=[1 -E22/E11]; D0=E11*E22-E12*E21 ; ...

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Approximate Value Using Taylor Polynomial
syms x f = (sin(x).^2).*(cos(x)) T = taylor(f,x,'order',10) double(subs(T,5))

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