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Re: Integration [message #83198 is a reply to message #82607]

Wed, 20 February 2013 10:18

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Wednesday, February 20, 2013 12:00:32 PM UTC-5, fd_...@mail.com wrote:
> Hi all
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>
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> I have a question about integration.
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>
>
It's not clear from your post whether you have tabulated data - a set of X,Y values -- or a known function. (DERIV works on tabulated data, but you give a function Y=2T.) For tabulated data, I suggest the Exelis procedure INT_TABULATED. But if you can write the IDL function, then it is possible to integrate with more accuracy since the function can be evaluated at any X value. In that case I suggest Craig Markwardt's QPINT1D

http://cow.physics.wisc.edu/~craigm/idl/down/qpint1d.pro

although there are several other good IDL integrators around. --Wayne

> I used the DERIV function in order to differentiate a function. Now I want to integrate a function but don't know which function to this work. I want a function that do the same work as the DERIV function but in the "opposite direction". E.g. Assume Y=2t, the integral of DERIV(t,Y) equals Y=2t (which is obvious I think).
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> Cheers
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> M

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[Message index]

		integration in idl By: gunvicsin11 on Sat, 05 January 2013 04:49
		Re: integration in idl By: Jeremy Bailin on Mon, 07 January 2013 14:27
		Re: Integration By: wlandsman on Wed, 20 February 2013 10:18

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