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Re: logical_true vs nothing in an if statment [message #85932 is a reply to message #85931] Wed, 18 September 2013 14:37 Go to previous messageGo to previous message
Paul Van Delst[1] is currently offline  Paul Van Delst[1]
Messages: 1157
Registered: April 2002
Senior Member
On 09/18/13 16:22, Michael Galloy wrote:
>
> But, you can change this behavior in selected routines with the
> logical_predicate compile option:
>
> IDL> for i = 0, 10 do if i then print, 'true' else print, 'false'
> false
> true
> false
...etc...
> IDL> compile_opt logical_predicate
> IDL> for i = 0, 10 do if i then print, 'true' else print, 'false'
> false
> true
> true
...etc...

True (pun intended :o), and the OP should make sure the option is put in
the procedure/function in question, not an IDL startup file!

Also, what if someone writes code based on the false/true ping-pong
behaviour, and then gives the code to someone else that DOES have the
logical_predicate option set in a startup file?

Would hilarity ensue?

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