I have this error "In an assignment A(I) = B, the number of elements in B and I must be the same."
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My code is like
I=zeros(1,5);
for i=1:4
[ma,I(i)]=max(areas);
end
Error: "In an assignment A(I) = B, the number of elements in B and I must be the same." [ma,I(i)]=max(areas); the second argument y in [x,y]=max(a) is a single element and I am trying to send single element only right?
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Walter Roberson
2016-4-29
max() of a 2D array results in a vector, not a scalar. The indices of that would not fit in the single location I(i)
You should be asking yourself why you are doing the same thing in every iteration of the loop. max(areas) is not going to change in the loop.
Why are you allocating 5 locations but only looping to 4?
2 个评论
Walter Roberson
2016-4-30
Your area variable is becoming a 2D array at some point.
Just before that section of code, add
assert(isscalar(areas), 'areas is unexpectedly array %s', str2num(size(areas)));
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Guillaume
2016-4-29
If areas is anything but a vector or scalar, then the return values of max are not scalar. See:
areas = magic(3)
[ma, l] = max(areas)
If you want the max of the whole matrix:
[ma, l(i)] = max(areas(:));
Note that in that case l(i) is the linear index of the max location.
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