How to repeat a row by a certain factor
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Jessica
am 26 Apr. 2015
Kommentiert: Mohammad Abouali
am 26 Apr. 2015
I have this sample matrix:
A=[2 2 2; 3 3 3; 4 4 4];
I would like to multiply each row by a certain factor (in this specific case, the first by 2, the second by 1, and the third by 3) to generate:
A_New= 2 2 2 2 2 2 3 3 3 4 4 4 4 4 4 4 4 4
Does anyone have suggestions on how to do this? I tried:
B = repmat(A,[2 1 3],1)
but this created separate matrices.
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Mohammad Abouali
am 26 Apr. 2015
Bearbeitet: Mohammad Abouali
am 26 Apr. 2015
% Creating sample data
A=[2 2 2; 3 3 3; 4 4 4];
nRep=[2,1,3];
% Constructing A_New as instructed.
A_new=cell2mat(arrayfun(@(r) repmat(A(r,:),1,nRep(r)), ...
1:numel(nRep), ...
'UniformOutput',false));
% printing the results
fprintf('A=');
fprintf('%d ',A_new)
fprintf('\n');
Once you run it you get this:
A=2 2 2 2 2 2 3 3 3 4 4 4 4 4 4 4 4 4
1 Kommentar
Mohammad Abouali
am 26 Apr. 2015
To preserve the structure then do this:
A=[2 2 2; 3 3 3; 4 4 4];
nRep=[2,1,3];
A_new=cell2mat( arrayfun(@(r) repmat(A(r,:),nRep(r),1),(1:numel(nRep))','UniformOutput',false) )
A_new =
2 2 2
2 2 2
3 3 3
4 4 4
4 4 4
4 4 4
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