The comprison works as documented. Note the if documentation states " An expression is true when its result is nonempty and contains only nonzero elements (logical or real numeric). Otherwise, the expression is false."
You provided if with a 1x400 logical vector as its condition, it contains no non-zero elements:
>> nnz(m<=1)
ans = 0
Based on this I would expect the else part to be executed, and this is indeed what occurs when i run your code.
Note that your vector m contains just one value repeated 400 times over:
>> unique(m)
ans = 100
It is not clear why you wanted to create that 1x400 vector in such an obfuscated way.
EDIT: the OP originally defined
m = logspace(2, 2, 400);
but has since edited the question and changed it to:
m = logspace(-2, 2, 400);
The relevance of reading the if documentation is unchanged.
