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Re: step function [message #76764 is a reply to message #76760]

Tue, 05 July 2011 07:33

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On 7/5/11 4:07 am, sid wrote:
> Hi all,
> Is there a standard programme for using step function in idl.
> If so please let me know.
> thank you
> Sid

You can use the comparison operators directly (maybe with some
arithmetic). Like:

y = x gt 5.

This makes the value of y be 1. for values of x greater than 5. and 0.
otherwise (i.e., less than or equal to 5.). If you don't want the value
of the step-function to be 0. and 1., then use some arithmetic:

y = (x gt 5) * (large_value - small_value) + small_value

Mike
--
Michael Galloy
www.michaelgalloy.com
Modern IDL, A Guide to Learning IDL: http://modernidl.idldev.com
Research Mathematician
Tech-X Corporation

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[Message index]

		step function By: sid on Tue, 05 July 2011 09:24
		Re: step function By: Michael Galloy on Tue, 05 July 2011 07:33
		Re: step function By: Gray on Tue, 05 July 2011 13:37

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