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Subtraction of elements in successive rows

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I have a matrix 'a'. I need an output matrix 'A' with each row equal to the difference between successive rows of the parent matrix 'a'. Is there a way to do this? I tried coding it in the following manner but keep getting an error message 'Unable to perform assignment because the left and right sides have a different number of elements.'
a=[1 2;2 4;3 6];
A=zeros(2,2);
for i=1:2
A(i)=(a(i+1,:)-a(i,:));
end
The expected result is A=[1 2; 1 2]

Accepted Answer

William
William on 1 Feb 2021
The easy way to do this is
A = diff(a);

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