How to subtract single element of matrix from any number

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rahul ahire
rahul ahire 2019-3-5
回答： Walter Roberson 2019-3-5
i am having a matrix 'devi1' and graylevel image 'b'
a variable av2 is having value 79
my code is
b(1,1)=abs(a(1,1)-av2);
currently a(1,1)=0
then b(1,1) should be 78
but it is caming '0'
please help me !

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回答（1 个）

Walter Roberson
Walter Roberson 2019-3-5
abs(double(a(1,1)) - av2)
Your array is uint8. When you subtract a larger value from a uint8 value, then the result does not become negative: the result is uint8 and so the result becomes 0. You need to convert to a signed representation to avoid the problem.

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