Hi Eckhard,
See my comments below.
Regards,
Arjen
> -----Original Message-----
> From: Eckhard Krotscheck [mailto:eckha...@buffalo.edu]
> Sent: Wednesday, December 27, 2017 2:07 AM
> To: plplot-general@lists.sourceforge.net
> Subject: [Plplot-general] plscmap1l -- gfortran
>
> Hi All
>
> .. I am new to this list. Trying to migrate from pgplot to plplot
>
> I have a problem with plscmap1l . The documentation gives on page 140 the call
>
> plscmap1l ( itype , npts , intensity , coord1 , coord2 , coord3 ,
> alt_hue_path );
>
> however if I I enter the entry npts I get an error message.
>
> For example, the example x20f.f90
> contains the call
>
> call plscmap1l(.true., pos, r, g, b, rev)
>
> if I change this to
>
> call plscmap1l(.true., 2, pos, r, g, b, rev)
>
>
>
>
> for 2 sample points I get the error message
>
> x20f.f90:613:50:
>
> call plscmap1l(.true., 2, pos, r, g, b, rev)
> 1
> Error: There is no specific subroutine for the generic 'plscmap1l' at (1)
>
>>AM: The reason for this is that the Fortran API uses the so-called redacted
>>form of the argument list. It uses the fact that Fortran, as of the Fortan 90
>>standard, can pass array descriptors rather than simple starting addresses.
>>This means that it is not necessary to add the size of the arrays explicitly.
>>If you need to pass a portion of an array you can do so by passing an array
>>section.
To illustrate:
call plscmap1l(.true., pos(1:2), r(1:2), g(1:2), b(1:2), rev(1:1))
would have the required effect. In general, however, we seldom need to pass so
many array sections.
C lacks this ability, so the C API explicitly requires passing the array sizes.
In general using the redacted form prevents a lot of mistakes - just consider
typing in the wrong size:
real, dimension(10) :: x, y
npts = 100
call plpoin( npts, x, y, 9 )
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