# For same Matrix subtraction between rows

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Vivek Shukla on 14 Oct 2020
Commented: Vivek Shukla on 15 Oct 2020
I have matrix size (1508 x 19).
I want to do subtraction between rows like Row 1 - Row 2, Row 1 - Row 4, Row 1 - Row 6, Row 1 - Row 8, Row 1 - Row 10, Row 1 - Row 12, Row 1 - Row 14,
Row 1 - Row 16, Row 1 - Row 18.
without changing the size of a matrix and remainng rows like (row 1, 3, 5, 7, 9, 11, 13, 15, 17, 19) stay same in matrix.
Can some one help me please
João Mendes on 14 Oct 2020
So what do you want as a result?
A matrix where the first row is row1-row2? The second one row1-row4? and so on?

a(2:2:end,:) = a(1,:)-a(2:2:end,:);
##### 3 CommentsShow 1 older commentHide 1 older comment
a(5:2:end,:) = a(3,:)-a(5:2:end,:);
Vivek Shukla on 15 Oct 2020
thank you

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