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Re: Hey! Pssst! Wanna see something wierd? [message #8094 is a reply to message #8012]

Mon, 03 February 1997 00:00

Joseph M Zawodny
Messages: 24
Registered: March 1996

Junior Member

David Fanning wrote:
>
> Alright you IDL gurus. Explain this!
>
> number = STRING(10)
> FOR j=0, number DO PRINT, 'Cool...!'
>
> Weird, huh. IDL reads my mind! :-)
>
> David

Well since the loop variable of a FOR loop has the type of the
first parameter (namely whatever follows the equal sign) and all
other parameters (end-value and step-value) converted to the
same type, I am not surprised too much. The conversion of properly
formatted string variables to byte, integer, float, ... is well
known (look at READS function). I know this since I have had the
misfortune of expecting the following to work.

for k=0,123456789L do ...

for k=0,5,0.1 do ...

Neither of them worked as I expected until rewritten as

for k=0L,123456789 do ...

for k=0.,5,0.1 do ...

Have fun!

--

Work: Dr. Joseph M. Zawodny Play: Joe Zawodny
NASA Langley Research Center KO4LW@amsat.org
E-mail: J.M.Zawodny@LaRC.NASA.gov zawodny@exis.net
(757) 864-2681 (757) 864-2671 FAX http://wwwp.exis.net/~zawodny

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[Message index]

		Hey! Pssst! Wanna see something wierd? By: davidf on Fri, 31 January 1997 00:00
		Re: Hey! Pssst! Wanna see something wierd? By: Andy Loughe on Mon, 03 February 1997 00:00
		Re: Hey! Pssst! Wanna see something wierd? By: pit on Mon, 03 February 1997 00:00
		Re: Hey! Pssst! Wanna see something wierd? By: Joseph M Zawodny on Mon, 03 February 1997 00:00

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