问题
After I run the code in matlab, I encounter this error and unsure how to solve it. How can I solve this problem.
Warning:
Operands to the || and && operators must be convertible to logical scalar values.
Jgray = double(rgb2gray(J));
% Calculate the Gradients
[dIx, dIy] = gradient(Jgray);
if max(dIx)<=103 && max(dIy)<=100
B = abs(dIy) - abs(dIx);
else
B = abs(dIx) - abs(dIy);
end
回答1:
If dIx and dIy are matrices (as opposed to 1-D vectors), max(dIx) and max(dIy) will return vectors.
&& and || should be used to compare scalars, not vectors.
You probably want to type
if max(dIx(:))<=103 && max(dIy(:))<=100
but I cannot tell for sure, as I dont know what the code is supposed to do :)
回答2:
Use & and | for matrixes instead of &&, || .
&& and || are short circuit operators. If you think about it, they make no sense for matrixes. For example, the short circuit or - || stops and returns true whenever the first argument is true.
But how would you extend that to a matrix?
来源：https://stackoverflow.com/questions/9172789/how-to-solve-operands-to-logical-scalar