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> 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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