MATLAB: Create a subset of data matrix randomly

random

i have a complete matrix of dimension 116X17. I need a half of the elements ie 896 elememens of the matrix are created randomly with all other cell have NaN value.

Best Answer

A = rand(116,17) ;  % your data 
N = 896 ;
iwant = NaN(size(A)) ;
idx = randperm(numel(A),N) ;
iwant(idx) = A(idx) ;

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MATLAB: How to select random rows from a matrix and delete it from the original matrix for another random selection.

A=rand(100); % a random matrix
n=10;. 
idx=randsample(1:size(A,1),n) ;
B = A(idx,:) ; % pick rows randomly 
A(idx,:)=[]; % remove those rows
idx = randsample(1:size(A,1),n) ;
C= A(idx,:);

MATLAB: Correlation between two row matrices

Like that, each value of "a" is correlated to each value of "b", but applying the formula of the correlation, the correlation of two single numbers is NaN. To compute the correlation correctly, traspose the input vectors

result  = corr(a', b');

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MATLAB: How to select random rows from a matrix and delete it from the original matrix for another random selection.

MATLAB: Correlation between two row matrices

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