MATLAB: Function that returns an NxN matrix

identity matrices

I need to create a function that when a value for N is entered it returns an NxN identity matrix. But this needs to be done without employing Matlab commands which operate on entire matrices, rows, and columns.

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for jj = N:-1:1
    out(jj,jj) = 1;
end

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MATLAB: How to concentrate matrix 100 times

Your approach is entirely in the wrong direction: using numbered variables is a sign that you are doing something wrong with your data/code design. Read this to know some of the reasons why:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

The simpler alternative is to load the file data into an output variable (which is a structure), then your task is trivially easy (and much more efficient):

N = 100;
C = cell(1,N);
for k = 1:N
    F = fullfile(...);
    S = load(F,'matrix_avg');
    C{k} = S.matrix_avg;
end
M = cat(2,C{:})

MATLAB: Bdschur algorithm in Matlab

According to the file bdschur.m, this uses LAPACK's DTRSYL and SLICOT's MB03RD functions. See

 >> edit bdschur

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MATLAB: How to concentrate matrix 100 times

MATLAB: Bdschur algorithm in Matlab

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