comp.lang.idl-pvwave archive: archive » logical_true vs nothing in an if statment

Home » Public Forums » archive » logical_true vs nothing in an if statment

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

Re: logical_true vs nothing in an if statment [message #85928 is a reply to message #85926]

Wed, 18 September 2013 12:53

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

See:

http://www.exelisvis.com/docs/Definition_of_True_and_F.html

Your "if i then..." example is well documented (if a little strange)
behaviour.

On 09/18/13 15:44, mynameismunka@gmail.com wrote:
> Why is the behavior of the 'if' statement in idl like this? I
> was under the impression putting nothing there is equivalent to
> the logical_true() statment???!
>
>
>
> IDL> for i=0,10 do if i then print,'true' else print,'false'
> false
> true
> false
> true
> false
> true
> false
> true
> false
> true
> false
> IDL> for i=0,10 do if logical_true(i) then print,'true' else print,'false'
> false
> true
> true
> true
> true
> true
> true
> true
> true
> true
> true
>

Report message to a moderator

[Message index]

		logical_true vs nothing in an if statment By: munka on Wed, 18 September 2013 12:44
		Re: logical_true vs nothing in an if statment By: David Fanning on Wed, 18 September 2013 12:48
		Re: logical_true vs nothing in an if statment By: munka on Wed, 18 September 2013 13:17
		Re: logical_true vs nothing in an if statment By: Paul Van Delst[1] on Wed, 18 September 2013 12:53
		Re: logical_true vs nothing in an if statment By: munka on Wed, 18 September 2013 13:07
		Re: logical_true vs nothing in an if statment By: Michael Galloy on Wed, 18 September 2013 13:22
		Re: logical_true vs nothing in an if statment By: Paul Van Delst[1] on Wed, 18 September 2013 14:37
		Re: logical_true vs nothing in an if statment By: David Fanning on Wed, 18 September 2013 15:06
		Re: logical_true vs nothing in an if statment By: billfreeman44 on Wed, 18 September 2013 15:44
		Re: logical_true vs nothing in an if statment By: wlandsman on Thu, 19 September 2013 13:22
		Re: logical_true vs nothing in an if statment By: Paul Van Delst[1] on Tue, 24 September 2013 07:48
		Re: logical_true vs nothing in an if statment By: David Fanning on Tue, 24 September 2013 07:51

Previous Topic:	idl: turn string value into variable name part2
Next Topic:	Reading large files with restore

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Oct 11 15:51:46 PDT 2025

Total time taken to generate the page: 1.19723 seconds