MATLAB: Matrix manipulation

matrix manipulation

Hi,

I would like to transform a matrix (5005*3) into a (165*91). Moving packets of lines (for example (92:182,1:3) and (183:273,1:3)..) to form new columns.

I tried to create a loop but it doesn't work

Thanks for your help

Best Answer

B = reshape(A',165,91); %pull from rows
or
B = reshape(A,165,91); %pull from columns

Depending on how you want to pull from A. It's not clear from your example

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row_index = [1;33;67]; %row indices
row_index = unique(cumsum(horzcat(row_index,ones(size(row_index,1),30)),2))

I threw the unique in there in case you have say (15,30) where 15 of the 15's values would overlap with some of the 30's. If there's no fear of that:

row_index = reshape(cumsum(horzcat(row_index,ones(size(row_index,1),30)),2).',[],1)

Definitely not a doit4me, as you posed your problem well, asked politely, made it interesting (matrix manipulation usually is).

Best Answer

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