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Get every 4 values of a vector and change values
a = [1 1 0 0 1 1 1 1 0 1 0 1 1 0 0 0 0 0 0 0 1 1 0 0] ; b = [1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1] ; idx = bsxfun(@...

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Group repeated values in an array and mention the repeated value with position
a=[ 6 6 5 6 5 6 6] ; [c,ia,ib] = unique(a) ; for i = 1:length(c) fprintf('Group %d = %d\n',i,c(i...

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How to make the sizes of all variable same in the loop.
% Demo data Game0 = rand(5,1) ; Game1 = rand(7,1) ; Game2 = rand(9,1) ; Game3 = rand(3,1) ; a = {Game0 Game1 Game2 Ga...

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How to define a function in correct form and plot it out?
Element by element division is needed. ./ should be used. T = linspace(0,1000,10); u = @(k,T,h_,n,m) k*T.*log(exp(pi*h_*h_*n./...

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Extract an arbitrary vector from a matrix
idx = 4:81 ; idy = 8:25 ; x = X(idx,idy) ; y = Y(idx,idy) ;

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Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.
This error occurs when you try to save ore number of elements in LHS than it is initialized for. A = zeros(2) ; A(1,:) = ran...

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How to replace all but one value with zero
f=[49; 18; 48] ; f(f~=18) = 0 ; % repalce by value f=[49; 18; 48] iwant = zeros(size(f)) ; iwant(3) = f(3) ; % replace ...

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smoothing of a 2d distribution
Read about interp2 and imresize.

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how to get a contour plot for a matrix with imaginary values
You can plot either ral, imaginary or absolute of the value. contourf(1:1:10,1:1:6,real(pm1)); % to plot real part contourf...

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Index exceeds the number of array elements. Index must not exceed 1023. How to remove this error or how to limit this error?
Error is clear. You are trying to extract more number of elements than present from the array. Example: A = rand(5,1) ; % ...

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How to plot contour map in MATLAB with time on X axis, drop diameter on Y axis with data containing number of drop diameters to show raindrop size distribution?
Read about scatter.

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How to make plot of an equation？
You messed up with linspace and the defined function. E = -10:0.1:10 ; r1 = 0.4; h_ = 6.62607004*10^-34; Vf = 10^6; ...

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How to predict new outputs on a trained Neural Net time series?
You need to export/ save the net i.e. weights into a function which the toolbox gives options. This saved function takes inputs ...

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works with dataset by searching for specific value
To find out NaN use isnan. A = [1 2 NaN 4 NaN 9] ; idx = isnan(A) Likewise to find out an array is empty read about isempty....

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Create a matrix of average Values from a Vector
The same implementation without loop: matrix = (vector+vector')/2 ; When you have used a loop, you need to initilaizethe matri...

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how do i deduce the function using linear regression for a set of x and y values?
clc clear all load x2.txt load y2.txt x=x2 ; y = log(y2) ; % Use polyfit p = polyfit(x,y,1) ; yCalc1 = polyval(p,x) ; ...

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How to convert 183*5 matrix data into column vector data
T = readtable('data.xlsx') ; T = table2array(T) ; T = T' ; T = T(:) ; plot(T)

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random selection for .csvfile
csvFiles = dir('*.csv'); N = length(csvFiles) ; idx = randi(N,1) ; csvFile = csvFiles(idx).name ; T = readtable (csvFile);

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How to create 15,24 25 26,33 34 35 36 37 in a triangle pattern?
https://in.mathworks.com/matlabcentral/answers/225558-how-to-create-a-1-12-123-1234-pattern-in-a-triangle https://in.mathworks...

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Shifting least negative value to zero
Let x be your data. xnew = x-min(x) ; Als have a loon on the function rescale. https://in.mathworks.com/help/matlab/ref/resc...

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Traingular mesh, face normals plotting
You can use the function facenormal. Read it here: https://in.mathworks.com/help/matlab/ref/triangulation.facenormal.html

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How to compile/save the data extracted/read from multiple excel files from each iteration of loop into a single file???
xlFiles = dir('*.xlsx'); N = length(xlFiles); Tmat = cell(N,1) ; for i = 1:N thisFile = xlFiles(i).name; T = rea...

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Memory usage of a function
N = 100; A = rand(N, N); b = rand(N, 1); mem1 = A \ b ; mem2 = sparse(A) \ b ; whos mem1 mem2

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How to color a small squared or half squared zone of the plot?
B = [23 1865; 36 1865; 36 1890 ; 23 1890] ; patch(B(:,1),B(:,2),'b') ; hold on plot(p,t) ;

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Passing one value at a time
A = rand(5,1) for i = 1:length(A) A(i) end

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EXAMPLE OF ALGORITHMIC/AUTOMATED TRADING MATLAB CODE
https://in.mathworks.com/discovery/algorithmic-trading.html https://in.mathworks.com/discovery/automated-trading.html

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I have a matrix P having 100 rows and 2001 columns. can you please help me to make a probability distribution curve of columns and mean line of rows.
x = rand(100,2001) ; % dummy data fro demo mx = mean(x) ; % mean of row elements h = histfit(mx,100,'kernel')

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how to change matlab answers type?
Read about format. https://in.mathworks.com/help/matlab/matlab_env/format-output.html Try format short

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total marks and percentage in marksheet of excelfile
T = readtable(myexcelfile) ; marks = table2array(T(:,3:6)) ; total_marks = sum(marks)/400 ; % four subjects each 100 marks ...

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Not enough input Arguments
The error is clear. You are trying to run the function by hitting the run button/ F5 key. You need to provide the inputs to the ...

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