Logical -1 = Logical 1?

Dear all, While reviewing a code I found the following expression:

assert(fid ~= -1, etc

By checking the logical operators I found that for a true condition the number is 1.

I would like to ask if in Matlab applies the same rule than for other packages where any non-zero value is true.

Thanks,

Diego

Answer 1

[Matt Fig]

Yes:

logical([-1 0 1 20 -10 .001 eps ])

The exception is NaN. NaN is non-zero, yet cannot be converted to logical. Try to do it and see what you get!

[Diego]

Thank you Matt.

Regards,

Diego

[Daniel Shub]

I think i is also an exception in that it is neither true nor false.