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Re: Simple question about the '>' sign. [message #69709 is a reply to message #69708]

Sat, 30 January 2010 12:38

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

munka writes:

> I came across this line:
>
> Y=( B - A*6)>0.
>
> is this equal to:
>
> Y=B - A*6
> index=where( Y lt 0., ct)
> if ct ne 0 then Y[index]=0.

No, this is the "greater than" operator. It compares
the two values on either side of the operator and returns
the largest of the two.

> Also, is the decimal point after the 0 significant?

No.

> It would help if
> I could find somewhere that listed all of the symbols. I think I
> found it once,when I had to figure out what the "~" did.... i just
> remember looking for a long time to try to figure out what that symbol
> meant. It is not blatantly obvious, and everything I google doesn't
> come up with the right answers :(

If you use the Index tab of the IDL on-line help and type
a greater than symbol into the Search box, this operator is
the first to appear.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Simple question about the '>' sign. By: Wout De Nolf on Wed, 03 February 2010 02:12
		Re: Simple question about the '>' sign. By: munka on Tue, 02 February 2010 20:52
		Re: Simple question about the '>' sign. By: Kenneth P. Bowman on Tue, 02 February 2010 07:23
		Re: Simple question about the '>' sign. By: David Fanning on Mon, 01 February 2010 15:02
		Re: Simple question about the '>' sign. By: R.G.Stockwell on Mon, 01 February 2010 14:55
		Re: Simple question about the '>' sign. By: David Fanning on Sat, 30 January 2010 16:25
		Re: Simple question about the '>' sign. By: wlandsman on Sat, 30 January 2010 13:39
		Re: Simple question about the '>' sign. By: David Fanning on Sat, 30 January 2010 12:38

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