comp.lang.idl-pvwave archive: archive » Possible to create 'keyword

Home » Public Forums » archive » Possible to create 'keyword_used' type function?

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Possible to create 'keyword_used' type function? [message #88717 is a reply to message #88715]

Mon, 09 June 2014 15:42

Chip Helms
Messages: 24
Registered: November 2012

Junior Member

Here's a cleaner version with some documentation as well.

;===============================
; PROGRAMMER: Chip Helms
; DATE: 6/9/2014
; DESCRIPTION: Determines if a variable
; is being used in any way (either having
; been given a value or set equal to a named
; variable as often used with keywords).
; It is equivilent to using:
; "n_elements(var) ne 0 or arg_present(var)"
; Note, the result does not have any meaning
; when called from $MAIN$ as calling the
; function automatically guarentees 'key' is
; set to a named variable or has a value.
; The exception to this is the trivial case
; of 'keyword_used()', which will return 0.
; PARAMETERS:
; key := variable to be tested for use
;===============================
function keyword_used, key
; grab list of variables at scope of parent routine
varnames = scope_varname(key,level=-2, count=nvar)
; determine if keyword is used as per arg_present function
; also protect against varnames being undefined for some reason
argtest = (nvar ne 0) ? total(varnames ne '') ne 0 : 0b
; return results of test for keyword presence
return, n_elements(key) ne 0 or argtest
end

Report message to a moderator

[Message index]

		Possible to create 'keyword_used' type function? By: Brian Devour on Mon, 09 June 2014 14:11
		Re: Possible to create 'keyword_used' type function? By: Chip Helms on Mon, 09 June 2014 15:27
		Re: Possible to create 'keyword_used' type function? By: Chip Helms on Mon, 09 June 2014 15:42
		Re: Possible to create 'keyword_used' type function? By: Fabzi on Tue, 10 June 2014 00:48
		Re: Possible to create 'keyword_used' type function? By: Michael Galloy on Tue, 10 June 2014 08:11
		Re: Possible to create 'keyword_used' type function? By: Brian Devour on Tue, 10 June 2014 13:19
		Re: Possible to create 'keyword_used' type function? By: Chip Helms on Fri, 13 June 2014 10:13

Previous Topic:	Ternary Plot in IDL?
Next Topic:	How to display an image (tvscl, shade_surf, etc.) with values cut-off

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 16:02:46 PDT 2025

Total time taken to generate the page: 0.00251 seconds