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Re: Need IDL 8 Help [message #87327 is a reply to message #87326]

Fri, 24 January 2014 12:22

Matthew Argall
Messages: 286
Registered: October 2011

Senior Member

> Humm. A overloaded operator is kinda like introducing a paragraph into
> the documentation that is written in Serbian, isn't it? ;-)

I thought so until I tried to write one :-p ... not quite sure how to interpret your sarcasm this time, so here is a [perhaps unnecessary] explanation.

Basically, if you do

[list] EQ [something]

each element of [list] will be checked to see if it is equal to [something]. However, one element in a list is not the same as an element in an array. Building on the previous example,

> IDL> message = 'CHANGED_COLORS'
> IDL>
> IDL> theHash = hash()
> IDL> obj1 = obj_new('idl_container')
> IDL> obj2 = obj_new('idlanroi')
> IDL> obj3 = obj_new('idlgrview')
> IDL>
> IDL> theHash[message] = list()
> IDL> theHash[message] -> add, obj1
> IDL> theHash[message] -> add, obj2
> IDL> print, theHash[message] eq obj3
> 0 0

IDL> theHash[message] -> add, [obj1, obj2]
IDL> print, theHash[message] EQ obj1
1 0 0

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[Message index]

		Need IDL 8 Help By: David Fanning on Thu, 23 January 2014 15:57
		Re: Need IDL 8 Help By: Matthew Argall on Thu, 23 January 2014 18:09
		Re: Need IDL 8 Help By: David Fanning on Fri, 24 January 2014 11:22
		Re: Need IDL 8 Help By: Matthew Argall on Fri, 24 January 2014 11:56
		Re: Need IDL 8 Help By: David Fanning on Fri, 24 January 2014 12:09
		Re: Need IDL 8 Help By: Matthew Argall on Fri, 24 January 2014 12:22
		Re: Need IDL 8 Help By: David Fanning on Fri, 24 January 2014 12:25
		Re: Need IDL 8 Help By: kagoldberg on Sat, 25 January 2014 00:55

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