Subtract rows in matrix using loop

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David du Preez
David du Preez le 11 Mai 2017
Commenté : David du Preez le 11 Mai 2017
Hi, I have a 11 x 3541 matrix. For each column I want subtract; row1 from row1 then,row1 from row 2 then, row2 from row 3 and so on. I have tried using a loop but it doesn't work.
for i= 0:12
mono_am = UVI_all_am(1+i,:) - UVI_all_am(i+1-i,:);
end

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Stephen23
Stephen23 le 11 Mai 2017
Modifié(e) : Stephen23 le 11 Mai 2017
Use diff:
diff(UVI_all_am,1,1)
And stick a row of zeros along the top if you really need row1 - row1.
  3 commentaires
Stephen23
Stephen23 le 11 Mai 2017
X = diff(UVI_all_am,1,1);
X = [zeros(1,size(X,2));X];
David du Preez
David du Preez le 11 Mai 2017
Thanks

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