Hi, Paul,
This looks like a linking error. The t_linear constructor makes use of an
identity matrix generator, which is (was?) exported into the loading module as
part of PDL::MatrixOps (used to be part of the whole “use PDL” sequence). That
occurs on or around line 2796 of transform.pd, and again a few lines later
(line 2811 in my copy). It’s possible that with recent cleanup of the various
libraries and export lists, “identity” is no longer being exported into the
PDL::Transform::Linear package on load. A good way to fix that would be to
make sure that PDL::Transform::Linear explicitly uses PDL::MatrixOps and
explicitly asks for identity() to be exported.
Cheers,
Craig
> On Oct 18, 2022, at 9:09 PM, Paul Goodall <paul.thomas.good...@gmail.com>
> wrote:
>
> Hi Ingo,
>
> With or without the curly braces - it's the same for me. Also - the error
> happens before the map stage, during the call to 't_linear'.
>
> I will write a simple Bilinear Interpolation myself, I would have just
> preferred to use the in-built capability in 'PDL::Transform'.
>
> ---
> pdl> use PDL::Transform;
>
>
>
> pdl> $im = rfits "m51.fits"
>
>
> Reading IMAGE data...
> BITPIX = -32 size = 262144 pixels
> Reading 1048576 bytes
> BSCALE = 1 && BZERO = 0
>
> pdl> $tr = t_linear({rot=>30});
>
>
> Undefined subroutine &PDL::Transform::Linear::identity called at transform.pd
> line 2729.
>
> pdl> $tr = t_linear(rot=>30);
>
>
> Undefined subroutine &PDL::Transform::Linear::identity called at transform.pd
> line 2729.
> ---
>
> cheers,
>
> Paul
>
>
>> On 18 Oct 2022, at 10:05 am, Ingo Schmid <ingo...@gmx.at
>> <mailto:ingo...@gmx.at>> wrote:
>>
>> Dear Paul,
>>
>> first, I think you do not need the curly { } around rot.
>>
>> Second, map needs $tr and $im. You can call it $tr->map($im) or
>> $im->map($tr), as far as I know.
>>
>> With these changes, it works for me.
>>
>> use PDL;
>> #use PDL::IO::;
>> use PDL::Transform;
>> use PDL::Graphics::Gnuplot;
>>
>> $im = rfits('/data/ingo/git/PDL/pdl-code/m51.fits');
>> $tr = t_linear({rot=>30});
>> print $Tr;
>> $im1 = $tr->map($im);
>> gplot {out=>'i1.png',term=>'png',},with=>'image',$im;
>> gplot {out=>'i2.png',term=>'png',},with=>'image',$im1;
>>
>>
>>
>>
>> Ingo
>>
>> On 10/18/22 07:52, Paul Goodall wrote:
>>> Hi perldl peeps,
>>>
>>> I'm trying to do something that should be really simple, but it seems I'm
>>> falling over at the first hurdle.
>>> I've replicated the error in it's simplest form from the example given in
>>> the docs as follows, and I've highlighted the offending line.
>>>
>>> ----
>>> use PDL <https://metacpan.org/pod/PDL::Transform>;
>>> use PDL::IO::Image <https://metacpan.org/pod/PDL::Transform>;
>>> use PDL::Transform <https://metacpan.org/pod/PDL::Transform>;
>>> $im = rfits('m51.fits');
>>> $tr = t_linear({rot=>30});
>>> $im1 = $tr->map($tr);
>>> ---
>>> And I'm hit with this one:
>>>
>>> > Undefined subroutine &PDL::Transform::Linear::identity called at
>>> > transform.pd line 2729.
>>>
>>> I'm using PDL v2.080 on Ubuntu 20.04 (focal).
>>>
>>> This feels like it's something that has been solved a million times, but I
>>> can't seem to find the solution. Am I looking at the wrong Docs or doing
>>> something obviously silly?
>>>
>>> cheers,
>>>
>>> Paul
>>>
>>>
>>>
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