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Topic: matrix from random selected data
Replies: 2   Last Post: Nov 7, 2013 6:08 PM

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Posts: 2,359
Registered: 12/6/04
Re: matrix from random selected data
Posted: Nov 7, 2013 3:38 PM
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"dony" wrote in message <l5fded$qdf$>...
> hai,
> I have some problem
> and i need help
> i have matrix in 100x100, and from this matrix i have some random selected data.
> from this data, i want to make it(selected data) to be a center of 3x3 new matrix
> and then from this new matrix i want to calculate mean and standart deviation.
> thanks for help

% The last part should be simple
% If A is your 3X3 "new" matrix, then

% or
% or some variation of that should give your mean value.
% Use std in the same way to get the standard deviation

doc mean
doc std

% Its not clear from your description how the "new"
% matrix is derived from the original 100X100 matrix.
% Can you provide an example?

% I'm guessing that if ii & jj are a location within
% your 100X100 matrix (call it X) then perhaps:

A = X((ii-1):(ii+1),(jj-1):(jj+1))

% might be what you want.
% Note: the above requires 1<ii,jj<100
% (can't be an edge).

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