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How do I append a row average to a new matrix

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hbcukid
hbcukid 2021-2-22
评论： hbcukid 2021-2-22
I have a 500x500 size matrix and I am trying to get the average of every 5 values in a row to make it a 100x100 matrix. How do I do that?
foo = randi(500,500)
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per isakson
per isakson 2021-2-22
编辑：per isakson 2021-2-22
"every 5 values in a row" that will give you a <500x100> matrix. Do you mean: and every five values in each column? Like average of every <5x5> submatrix.

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per isakson
per isakson 2021-2-22
With a little bit of guessing. Does this answer your question?
%%
foo = randi(500,500);
cac = mat2cell( foo, 5*ones(100,1), 5*ones(100,1) );
num = cellfun( @(sub) mean(sub(:)), cac );
num is <100x100>

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