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Re: problem plotting "N-d object"
From: |
Sergei Steshenko |
Subject: |
Re: problem plotting "N-d object" |
Date: |
Sun, 19 Feb 2012 01:18:42 -0800 (PST) |
----- Original Message -----
> From: Ben Abbott <address@hidden>
> To: CdeMills <address@hidden>
> Cc: address@hidden
> Sent: Sunday, February 19, 2012 1:41 AM
> Subject: Re: problem plotting "N-d object"
>
> On Feb 18, 2012, at 2:44 PM, CdeMills wrote:
>
>> bpabbott wrote
>>
>>> I'm not really concerned about buggy code accidentally triggering
> this
>>> functionality. At the same time, if such a change is accepted, then it
>>> needs to be documented and demos should be needed.
>>>
>>> I'm not sure a new squeezable N-D array will do the job in a clean
> way.
>>> Maybe I'm missing something? Are you thinking of overloading the
> plot
>>> function?
>>
>> Buggy code should trigger error messages ASAP.
>>
>> Now, I often run simulations and collate 1D and 2D matrices into 3D, where
>> the third dim is the run number. Auto-squeezing would be convenient, but I
>> think we should have a flag to tell plot "I know my data are 3D, but
> please
>> squeeze them." This way it is the INTENT to pass 3D data and have a 1D
> or 2D
>> plot.
>>
>> Regards
>>
>> Pascal
>
> Thats a good idea !
>
> The plot function already accepts property name/value pairs. Is the syntax
> below
> ok ?
>
> plot (x, y, "-squeeze")
>
> Since this feature may not be desired for all lines, the flag should only be
> applied to the line object proceeding it.
>
> plot (x1, y1, "-squeeze", x2, y2, "color",
> "r")
>
> This would allow x1 and y1 to be squeezed (if needed) and produce a blue
> solid
> line. The second line would not be squeezed and would produce a red solid
> line.
>
> Look ok ?
>
> Ben
>
>
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.
Regards,
Sergei.
>
- Re: problem plotting "N-d object", (continued)
- Re: problem plotting "N-d object", Ben Abbott, 2012/02/17
- Re: problem plotting "N-d object", Sergei Steshenko, 2012/02/17
- Re: problem plotting "N-d object", Jordi Gutiérrez Hermoso, 2012/02/17
- Re: problem plotting "N-d object", Ben Abbott, 2012/02/17
- Re: problem plotting "N-d object", Jordi Gutiérrez Hermoso, 2012/02/17
- Re: problem plotting "N-d object", CdeMills, 2012/02/17
- Re: problem plotting "N-d object", Ben Abbott, 2012/02/17
- Re: problem plotting "N-d object", CdeMills, 2012/02/18
- Re: problem plotting "N-d object", Ben Abbott, 2012/02/18
- Re: problem plotting "N-d object", Jordi Gutiérrez Hermoso, 2012/02/18
- Re: problem plotting "N-d object",
Sergei Steshenko <=
- Re: problem plotting "N-d object", Ben Abbott, 2012/02/19
- Re: problem plotting "N-d object", Sergei Steshenko, 2012/02/19
- Re: problem plotting "N-d object", Ben Abbott, 2012/02/19
- Re: problem plotting "N-d object", CdeMills, 2012/02/19
- Re: problem plotting "N-d object", Sergei Steshenko, 2012/02/19
- Re: problem plotting "N-d object", CdeMills, 2012/02/20
- Re: problem plotting "N-d object", Pascal A. Dupuis, 2012/02/20
- Re: problem plotting "N-d object", Jordi Gutiérrez Hermoso, 2012/02/20
- Re: problem plotting "N-d object", Pascal A. Dupuis, 2012/02/20
- Re: problem plotting "N-d object", Ben Abbott, 2012/02/20