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Re: Warning: IDL 8.0 alters the behaviour of existing valid programs without any notice! [message #72299 is a reply to message #72243] Tue, 24 August 2010 14:15 Go to previous message
Timm Weitkamp is currently offline  Timm Weitkamp
Messages: 66
Registered: August 2002
Member
Not that it would actually *help*, but may I add that previous
versions of IDL have also "altered the behaviour of existing valid
programs without any notice". This happened, for example, when the
behavior of ATAN with a complex-valued argument was changed in IDL
5.6.

I actually ran into this problem a short while ago when running a
third-party image processing routine that used ATAN to obtain the
phase of a complex quantity and had been written in the days before
the PHASE keyword.

I noticed because of the slightly weird results the routine gave me.
It took me some time. Yes, it was annoying. I believe the change in
IDL should not have been made that way. It would have been easy for
RSI at the time to do it differently. But I survived, and so did all
those other IDL users who need to know the argument of a complex
number, I suppose.

Timm

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