# I have a data set of 400 columns and 644rows .I need to select columns 1,2,11,12,​21,22,....​.381,382,3​91,392 or move these particular columns in to a matrix.how can i write code for this in matlab

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Sindhu Reddy on 30 Mar 2016
Commented: Azzi Abdelmalek on 30 Mar 2016
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20. from this columns i need to select 1,2,11,12 columns in to one matrix and the remaining in to another matrix. 20 is just an example..i want the answer for 400 columns and 644 rows.
per isakson on 30 Mar 2016
Edited: per isakson on 30 Mar 2016

Roger Stafford on 30 Mar 2016
If M is the matrix with 400 columns, and if M2 is the matrix to be obtained from it, do this:
n = 400;
M2 = M(:,mod((1:n)-1,10)<=1);
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Roger Stafford on 30 Mar 2016
n = 400;
M2 = M(:,mod((1:n)-1,10)<=1); % <-- Into one matrix
M3 = M(:,mod((1:n)-1,10)>=2); % <-- Into the other matrix

Azzi Abdelmalek on 30 Mar 2016
Edited: Azzi Abdelmalek on 30 Mar 2016
A=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]
idx=[1,2,11,12]
out1=A(idx)
out2=A(setdiff(1:numel(A),idx))
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Azzi Abdelmalek on 30 Mar 2016
Who said to list to list the 400 elements?

MHN on 30 Mar 2016
Edited: MHN on 30 Mar 2016
A = 1:20;
M1 = A([1,2,11,12]);
M2 = setdiff(A,M1);