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Re: derivative function in IDL similar as DIFF in matlab [message #86465 is a reply to message #86464]

Tue, 12 November 2013 04:07

lecacheux.alain
Messages: 325
Registered: January 2008

Senior Member

Le mardi 12 novembre 2013 13:01:15 UTC+1, Matthew Argall a écrit :
> On Tuesday, November 12, 2013 5:08:11 AM UTC-5, Jie Zhou wrote:
>
>> Is there a derivative function in IDL similar as DIFF in matlab? I think the DERIV is different from DIFF.
>
>
>
> TS_DIFF(data, 1) would be equivalent.

TS_DIFF(data, 1) is simply doing a shift by one (i.e. data - shift(data, 1)), but by using a for loop!
alx.

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[Message index]

		derivative function in IDL similar as DIFF in matlab By: Jie Zhou on Tue, 12 November 2013 02:08
		Re: derivative function in IDL similar as DIFF in matlab By: lecacheux.alain on Tue, 12 November 2013 02:27
		Re: derivative function in IDL similar as DIFF in matlab By: Matthew Argall on Tue, 12 November 2013 04:01
		Re: derivative function in IDL similar as DIFF in matlab By: lecacheux.alain on Tue, 12 November 2013 04:07
		Re: derivative function in IDL similar as DIFF in matlab By: Matthew Argall on Tue, 12 November 2013 04:08
		Re: derivative function in IDL similar as DIFF in matlab By: Jie Zhou on Tue, 12 November 2013 04:18
		Re: derivative function in IDL similar as DIFF in matlab By: Matthew Argall on Tue, 12 November 2013 06:07

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