If statement using the value in the row before

2016 6 22
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I have a matrix and am trying to assign a new value to an entry in the matrix if the difference between the entry and the entry in the row before is greater than 180. I tried to just create a new matrix(B) that was the difference between the original matrix entries (A) and the entries before but got an error.
B= A(i,:)- A(i-1,:)
Error:
Subscript indices must either be real positive integers or logicals.

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James Tursa
James Tursa 2016-6-22

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You probably started the loop with i=1. When i=1, the i-1 index evaluates to 0, hence the error. Start your loop at i=2 instead.

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