Re: problem plotting "N-d object"

[CdeMills]

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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