Remove random columns from a big matrix?

Hello,

I have this issue: I want to randomly remove 3000 columns from a big matrix with size 1600X8500. below I have a code I wrote but when I run it the matlab outputs the following error: Index exceeds the number of array elements (1650)

A=[x1 x2 ...] % 1600by8500 matrix
    k=randperm(size(A,1));
    B=A;
    B(:,k(1:3000))=[];

Your help is important!!

Answer 1

[Adam Danz]

If A is 1600 x 8500 as you describe, then the line below will only create 1600 elements so you can't use an index of 1:3000.

k=randperm(size(A,1));

Instead, you want to use the 2nd dimension of A

k=randperm(size(A,2));
   %              ^

[stelios loizidis]

I tried it and it works fine. Thank you very much!!!!!

[Adam Danz]

Glad I could help!

Answer 2

[madhan ravi]

B(:,randperm(size(A,2),3000))=[]

[stelios loizidis]

Thank you very much!!!!