How do I change certain value of a matrix by adding a something to the existing value?

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A LL
A LL 2020-9-14
评论： A LL 2020-9-14
I am very new to this.
I would like to change all the negative value of my matrix by 360+abs(existing value).
Let A be a matrix, I tried this:
A(A<0)=360+A
But it returns: Unable to perform assignment because the left and right sides have a different number of elements.
Could someone explain this to me?
Thank you

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David Hill
David Hill 2020-9-14
A(A<0)=360+abs(A(A<0));

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