Logical -1 = Logical 1?

1 回表示 (過去 30 日間)

Diego 2012 年 11 月 13 日

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

Matt Fig 2012 年 11 月 13 日

編集済み: Matt Fig 2012 年 11 月 13 日

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 2012 年 11 月 13 日

Thank you Matt.

Regards,

Diego

Daniel Shub 2012 年 11 月 14 日

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

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