pass string as function input argument in matlab

Question

I need to generate different block diagonal matrices like:

blkdiag(0,0,0, ... ,0,unit)

blkdiag(0,0,0, ... ,0,unit,unit)

.

blkdiag(unit,unit, ... ,unit,unit)

in say 100 iterates and evaluate them with unit being a m*m matrix. I generate the string of the argument in a loop, however function does not understand char input and I don't know what to do!

any help is appreciated ...

beaker · Accepted Answer · 2017-09-27 23:12:11Z

2

blkdiag wants numeric values as inputs in a comma-separated list. An easy way to generate a comma-separated list is using cell arrays.

I assume that by "100 iterates" you mean that you're passing 100 values to blkdiag, with the first call being 99 zeros and one instance of unit, and the last call being 100 instances of unit.

unit = magic(5);   % some random test matrix for unit
total_iterations = 100;   % total number of iterations to go through
C = cell(2*total_iterations-1);     % total size of cell array
C(1:total_iterations-1) = 0;
C(total_iterations:end) = unit;
for iter = 1:total_iterations
   new_matrix = blkdiag(C{iter:iter+total_iterations-1});
   % do other stuff here...
end

C{a:b} generates a comma-separated list of the elements of C, which is just what we need.

answered Sep 27, 2017 at 23:12

beaker

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1 Comment

HMDRZAA Over a year ago

thank you ... cell is exactly what i needed ... didn't know about it ...

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