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Re: Matlab check for negation of empty matrix
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From: |
Olaf Till |
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Subject: |
Re: Matlab check for negation of empty matrix |
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Date: |
Fri, 28 Mar 2014 14:15:51 +0100 |
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User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Thu, Mar 27, 2014 at 04:18:07PM -0400, John W. Eaton wrote:
> <snip>
> all ([]) => 1
> any ([]) => 0
If [] is interpreted as in the special case of a vector argument (no
column-wise operation) it makes sense to me: any statement regarding
the particular elements of [] is true (since there are no elements) so
it is also true that "all" elements are true; but "any" seems to imply
that elements exist, so it is false.
> <snip>
> Shouldn't these results just be [](1x0)
> since there are no columns and these functions operate over the
> columns of their arguments?
If [] is interpreted as a matrix argument, yes. I agree that treating
a vector argument as a special case is a source of inconsistency.
> <snip>
> But in any case, we don't get to choose this behavior if we want to
> remain compatible with Matlab.
Sadly true.
Olaf
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