MATLAB: How to write numbers before it occurs

matrixnumbers

Hey,
i have a problem that i am trying to solve for some time but still haven't. I have a matrix with 6 columns and a lot of rows. In example i put just 3 columns:
AA =
0.001 4.55 0
0.002 4.68 0
0.003 4.59 0
0,005 4.78 0
0,006 4.99 5
….
So what i need is to find the number (it can vary from 1 to 7) and take this number and write the same number up the cells until it reaches 3000 cell from that number. Than take another one and do the same and etc. So it this exaple i would get:
AA=
0.001 4.55 5
0.002 4.68 5
0.003 4.59 5
0,005 4.78 5
0,006 4.99 5
….
Could anyone lead me on the right track how to do it? I would appreciate any kind of help.

Best Answer

rowidx = find(AAA(:,appropriate_column) ~= 0);
for start_row = rowidx(:).'        %need to be sure it is a row vector
    AA(startrow-3000:startrow-1, appropriate_column) = AAA(start_row, appropriate_column);
end
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