MATLAB: How can i randomly divide a dataset(matrix) into k parts ?

dataset division

I have a database and i want to randomly divide it into ka parts of equal size . if the database has n row each part will contain n/k randomly chosen row from the dataset .

Best Answer

function [idxo prtA]=randDivide(M,K) 
[n,m]=size(M);
np=(n-rem(n,K))/K;
B=M;
[c,idx]=sort(rand(n,1));
C=M(idx,:);
i=1;
j=1;
ptrA={};
idxo={};
n-mod(n,K)
while i<n-mod(n,K)
    prtA{j}=C(i:i+np-1,:);
    idxo{i}=idx(i:i+np-1,1);
    i=i+np;
    j=j+1;
end
prtA{j}=C(i:n,:);
end
this a my algo it works very well think u for ur answers
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