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Message from discussion use of optional parameters
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Louisa  
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 More options Apr 7 2012, 11:35 am
Newsgroups: comp.lang.fortran
From: Louisa <louisa.hu...@gmail.com>
Date: Sat, 7 Apr 2012 08:35:23 -0700 (PDT)
Local: Sat, Apr 7 2012 11:35 am
Subject: Re: use of optional parameters
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On Apr 8, 12:45 am, hel...@astro.multiCLOTHESvax.de (Phillip Helbig---

undress to reply) wrote:
> In article
> <1c75384d-c73a-436f-850b-a46b7eb1a...@h20g2000yqd.googlegroups.com>,

> Michael <michael.caracots...@gmail.com> writes:
> > What is exactly that you are trying to accomplish? speed, clarity,
> > robustness?

> All three.

> The idea is a very general routine which calculates many things.  It
> isn't a good idea to have IF (PRESENT(X)) in the code since a) the
> calculation is rather quick and b) some things are needed internally
> even if the user doesn't want them returned.  I want to avoid a long
> parameter list; the user should just specify what he wants, maybe just
> one parameter from, say, 20.  I don't like the idea of global variables.

> > why would you use GOTO statements? You can avoid a large
> > list of arguments in a subroutine by using structures..

> Not sure what you mean here.  For the user, it should be easy to use,
> just CALL SUB(input1=x,input2=y,output1=a,output2=b) etc where the user
> needs to declare just these arguments.

Another possibility is to use generic procedures to deal with the
different numbers of arguments.

 
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