Re: difference of cell arrays behavior between octave-3.0.5 and octave-3.4.2

[Sergei Steshenko]

--- On Mon, 8/1/11, Ben Abbott <address@hidden> wrote:

> From: Ben Abbott <address@hidden>
> Subject: Re: difference of cell arrays behavior between octave-3.0.5 and 
> octave-3.4.2
> To: "Sergei Steshenko" <address@hidden>
> Cc: address@hidden
> Date: Monday, August 1, 2011, 5:07 AM
> 
> On Aug 1, 2011, at 5:31 AM, Sergei Steshenko wrote:
> 
> > In octave-3.0.5 I have:
> > 
> > "
> > octave:1> foo{1}(:) = []
> > foo =
> > 
> > {
> >  [1,1] = [](0x0)
> > }
> > 
> > octave:2> foo{2}(:) = [2;3]
> > foo =
> > 
> > {
> >  [1,1] = [](0x0)
> >  [1,2] =
> > 
> >     2   3
> > 
> > }
> > 
> > octave:3> 
> > ".
> > 
> > In octave-3.4.2 I have:
> > 
> > "
> > foo{1}(:) = []
> > foo =
> > {
> >  [1,1] = [](0x0)
> > }
> > octave:2> foo{2}(:) = [2;3]
> > error: A(I) = X: X must have the same size as I
> > octave:2>
> > ".
> > 
> > 
> > Why is it so that in octave-3.4.2 I have an error ?
> > 
> > Why at all size checking kicks in - "foo{2}(:)"
> doesn't yet have size,
> > it should be created according to RHS.
> > 
> > Which of the two behaviors is nominally correct
> (Matlab) ?
> 
> >> clear all
> >> foo{1}(:) = []
> 
> foo = 
> 
>     {[]}
> 
> >> foo{2}(:) = [2;3]
> ???  In an assignment  A(:) = B, the number of
> elements in A and B
> must be the same.
> 
> >> foo{2}(1:2) = [2;3]
> 
> foo = 
> 
>     []    [1x2 double]
> 
> I compared with the developers sources (default branch) and
> see that his last command works there as well.
> 
> Ben
> 
> 
> 

So, do I understand correctly - your screen session is from Matlab and
it doesn't accept

foo{2}(:) = [2;3]

like I experienced ?

...

I have rechecked again myself. with no old packages in 3.4.2 I also have


"
address@hidden:~> (export GNUTERM=wxt; 
/mnt/sdb8/sergei/AFSWD_debug/20110601/octave-3.4.2/binsh/octave)
GNU Octave, version 3.4.2
Copyright (C) 2011 John W. Eaton and others.
This is free software; see the source code for copying conditions.
There is ABSOLUTELY NO WARRANTY; not even for MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  For details, type `warranty'.

Octave was configured for "i686-pc-linux-gnu".

Additional information about Octave is available at http://www.octave.org.

Please contribute if you find this software useful.
For more information, visit http://www.octave.org/help-wanted.html

Read http://www.octave.org/bugs.html to learn how to submit bug reports.

For information about changes from previous versions, type `news'.

octave:1> foo{1}(:) = []
foo =
{
  [1,1] = [](0x0)
}
octave:2> foo{2}(:) = [2;3]
error: A(I) = X: X must have the same size as I
octave:2>              
".

So, a practical question - how do I achieve what I want ? Isn't cell array
supposed to hold values of possibly different sizes per index ?

Thanks,
  Sergei.