comp.lang.idl-pvwave archive: archive

Home » Public Forums » archive » Derivatives

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Derivatives [message #86553]

Tue, 19 November 2013 02:20

fd_luni
Messages: 66
Registered: January 2013

Member

Hi

I want to use the simple differentiation formula instead of DERIV function( 3-point, Lagrangian interpolation):

Derivative=change in y/change in x

I wrote my code like this but my results are absolutely wrong and I don't see where my mistake is.

derivative= (A[1:*]-A)/ (t[1:*]-t)
derivative=[0,derivative]

I did the last step i.e. derivative=[0,derivative] because I need an array[2001,1] instead of array[2000,1].

Many Thanks
Mar

Report message to a moderator

[Message index]

		Derivatives By: fd_luni on Tue, 19 November 2013 02:20
		Re: Derivatives By: Mats Löfdahl on Tue, 19 November 2013 02:49
		Re: Derivatives By: fd_luni on Tue, 19 November 2013 07:23
		Re: Derivatives By: Craig Markwardt on Tue, 19 November 2013 18:45

Previous Topic:	Time conversion for .nc file
Next Topic:	_EXTRA KEYWORD

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 13:31:14 PDT 2025

Total time taken to generate the page: 0.00440 seconds