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Re: Need IDL 8 Help [message #87324 is a reply to message #87321]

Fri, 24 January 2014 11:56

Matthew Argall
Messages: 286
Registered: October 2011

Senior Member

>> IDL> if (max(theHash[message] eq obj1) eq 0) then theHash['CHANGED_COLORS'] -> add, obj1

> I don't really understand this code and the way you use
> the Max function.

theHash[message] is the list of objects receiving/sending messages. Lists have _overloadEQ methods that compare each entity in the list to the desired quantity. If the maximum in the array of 1's and 0's is 0, then you know that the object is not in the list already.

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

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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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