How to store in a for loop

Hello

I have a data that consist of 274x64 data that is double.

I want to make a loop that saves the data per 4 columns so I don't have to write the code like this.

CPT1 = [Data(:,1) Data(:,2) Data(:,3) Data(:,4)];
CPT2 = [Data(:,5) Data(:,6) Data(:,7) Data(:,8)];
CPT3 = [Data(:,9) Data(:,10) Data(:,11) Data(:,12)];
CPT4 = [Data(:,13) Data(:,14) Data(:,15) Data(:,16)];

This is what I've been trying:

CPT = cell(16,1);
for j=0:4:columns/4-4
for i=1:4
    CPT() = [Data(:,i+j) Data(:,i+1+j) Data(:,i+2+j) Data(:,i+3+j)];
end
end

But I don't know how to make i save them as 16 individual "CPT" What do I do?

Best Regards

[Stephen23]

Use mat2cell: this will be the simplest solution.

Answer 1

[Walter Roberson]

ncol = size(Data,2);
ngroups = ncol/4;
CPT = cell(groups, 1);
for K = 1 : groups
  CPT{K} = Data(:, (K-1)*4+[0 1 2 3]);
end

Or...

CPT = mat2cell(Data, size(Data,1), 4 * ones(1, size(Data,2)/4) );

[Mikkel Ibsen]

Am I missing something?

First error: Undefined function or variable 'groups'.

ncol = size(Data,2);
ngroups = ncol/4;
CPT = cell(groups, 1); <- Is it ngroups ?
for K = 1 : groups     <- Is it ngroups ?
  CPT{K} = Data(:, (K-1)*4+[0 1 2 3]);
end

When I tried changing the groups into ngroups, i got the error:

Subscript indices must either be real positive integers or logicals.

[Walter Roberson]

ncol = size(Data,2);
ngroups = ncol/4;
CPT = cell(ngroups, 1);
for K = 1 : ngroups
  CPT{K} = Data(:, (K-1)*4+[1 2 3 4]);
end