Re: [Plplot-general] plwidth fails to link under Cygwin against plplot5.9.10 libraries

[Arjen M. <Arj...@de...>]

Hi John,



I have seen this type of behaviour under MinGW. I still have to figure why this is happening there.



What happens if you leave out the call to plsdev and instead use the command-line option "-dev wingcc"? I assume you use the routine plparseopts like in all examples - that does the trick for me.



Regards,



Arjen



From: John Baumgardner [mailto:jrb...@co...]
Sent: Monday, January 19, 2015 6:53 PM
To: Arjen Markus; Alan W. Irwin; John Baumgardner
Cc: plp...@li...
Subject: RE: [Plplot-general] plwidth fails to link under Cygwin against plplot5.9.10 libraries

Hi Alan and Arjen,

   Thanks for that piece of information about the f95 implementation not requiring the array dimensions.  With that awareness, I was able quickly to modify the f77 code to compile correctly.

   However, I am now having difficulties when I attempt to execute.  My executable is unable to find the device drivers.  Here is the message I get:

*** PLPLOT ERROR, ABORTING OPERATION ***
plInitDispatchTable: Could not open drivers directory, aborting operation
Requested device wingcc not available

Plotting Options:

Enter device number or keyword:

  At the top of my main program, as implied by this output, I have the line call plsdev('wingcc').

   I copied the plplot dll and drivers directories into the directory where I am trying to execute, hoping that might resolve the problem.  But it did not.  Any suggestions as to what I am missing?

Thanks,
John

At 01:44 AM 1/19/2015, Arjen Markus wrote:


Hi John,



> -----Original Message-----
> From: Alan W. Irwin [ mailto:ir...@be...]
> Sent: Sunday, January 18, 2015 2:49 AM
> To: John Baumgardner
> Cc: plp...@li...<mailto:plp...@li...>
> Subject: Re: [Plplot-general] plwidth fails to link under Cygwin against plplot5.9.10
> libraries
>
> However, the good news is I found what I needed (circle.f and how you built it) to
> figure out this problem which turns out not to be specific to Cygwin.
>
> > $ compile.sh
> > circle.f:26.72:
> >
> >      call plline(n101,xx,yy)
> >
> > 1
> > Error: There is no specific subroutine for the generic 'plline' at (1)
>

This is a typical message relating to the available interfaces for plline. The thing is that with Fortran 95 and beyond you can define a single interface name to be applied to multiple implementations. The compiler looks at the actual argument list and decides to use the implementation that matches that list (by number of arguments and the type, kind and rank of each). If it can not find any matching implementation, it will respond with a message like the above.

For the Fortran 95 bindings we have used the features provided by that standard as much as possible. One is that arrays ?know? their size. So the routine plline queries the arrays xx and yy for their size and there is no need to pass the size explicitly. That method is actually rather error-prone.

If you want to pass a section of the array only, you can use:

Call plline( xx(1:10), yy(1:10) )

For instance.

> I verified that issue.  To solve it, I simply used the redacted form of
> subroutine/function call with the redundant dimension information dropped, i.e.,
>
> call plline(xx,yy)
>
> Note, it is quite a while since we have used the f77 interface so my original advice to
> you was incomplete about converting over to f95.  I should have also added to the
> "use plplot" advice that since we dropped f77, our f95 capabilities and API have
> evolved and, for example, we are now taking advantage of certain Fortran 95
> capabilities like knowing the redundant array dimensions.  So you have to use the
> redacted form (like above with redundant dimension information dropped) of all calls.
>
> When in doubt about exactly what the redacted form is, look at files in examples/f95/
> for working examples of all the calls to the PLplot Fortran binding API.
>

Regards,



Arjen
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DISCLAIMER: This message is intended exclusively for the addressee(s) and may contain confidential and privileged information. If you are not the intended recipient please notify the sender immediately and destroy this message. Unauthorized use, disclosure or copying of this message is strictly prohibited. The foundation 'Stichting Deltares', which has its seat at Delft, The Netherlands, Commercial Registration Number 41146461, is not liable in any way whatsoever for consequences and/or damages resulting from the improper, incomplete and untimely dispatch, receipt and/or content of this e-mail.