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## Re: problem plotting "N-d object"

 From: CdeMills Subject: Re: problem plotting "N-d object" Date: Sun, 19 Feb 2012 09:33:35 -0800 (PST)

```Sergei Steshenko-2 wrote
>
> I think we've lost track.
>
> To write "-squeeze" takes more effort than just "(:)".
>
> But the root cause of my original Email is that Octave _wrongly_ thinks
> that foo(1,1,:) is an N-d object.
>
> The original testcase:
>
> "
> octave:3> foo(1,1,:) = [1 2 3]
> foo =
>
> ans(:,:,1) =  1
> ans(:,:,2) =  2
> ans(:,:,3) =  3
>
> octave:4> plot(foo(1,1,:));
> error: transpose not defined for N-d objects
> error: called from:
> error:
> /home/qemu/AFSWD/20111122/octave-3.4.2/share/octave/3.4.2/m/plot/private/__plt__.m
> at line 179, column 8
> error:
> /home/qemu/AFSWD/20111122/octave-3.4.2/share/octave/3.4.2/m/plot/private/__plt__.m
> at line 104, column 17
> error:
> /home/qemu/AFSWD/20111122/octave-3.4.2/share/octave/3.4.2/m/plot/plot.m at
> line 194, column 9
> octave:4> plot(foo(1,1,:)(:));
> octave:5>
> ".
>
> I insist that in this case foo(1,1,:) is a _one_-d object - because two of
> the three indexes are fixed/constant.
>
> I.e. the plot family of functions tries to do the right thing already, but
> because foo(1,1,:) is _not_ seen by Octave as a 1-d object the functions
> fail.
>
>
>

I think we didn't.

As I told in a previous post, enabling automatic size reduction would
prevent to detect buggy code, i.e. code where a 3D result is produced when a
2D result is expected.

OTOH, 'plot' accepts a number of xy combinations: empty x- vector y;  empty
x- matrix y, vector x-vector y, matrix x-vector y, vector x - matrix y. What
to do if there is one singleton dim, if there are two ? Could you elaborate
?

Regards

Pascal

--
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```

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