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Re: what is i in idl 4.0 ? [message #16649 is a reply to message #16640]

Mon, 09 August 1999 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

John Stanly Videen (user@internet.com) writes:

> Does anyone know what the system variable representation for i is in idl
> 4.0?
>
> [ where i = sqrt(-1) ]
>
> In idl 3.6, it used to be !j, but this doesn't seem to work in 4.0....
>
> eg. this code works in 3.6, but not 4.0:
>
> phase=atan(imaginary(data_ref), float(data_ref))
> temp=exp(- phase * !j )
> data=temp*data

I've been hanging around IDL for a LONG time, but
I've never heard of a system variable named !J.
I'm going to guess that this was a system variable
that a user created in a startup file in your IDL
3.6 distribution that is not being created in your
IDL 4.0 distribution.

But then again, IDL 3.6 was s-o-o-o long ago, that
maybe something like this did exist and I've forgotten
about it. There are days I feel like I've forgotten more
about IDL than I currently know. :-(

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Re: what is i in idl 4.0 ? By: gurman on Tue, 10 August 1999 00:00
		Re: what is i in idl 4.0 ? By: Richard G. French on Tue, 10 August 1999 00:00
		Re: what is i in idl 4.0 ? By: davidf on Mon, 09 August 1999 00:00

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