| Integration [message #83200] |
Wed, 20 February 2013 09:00  |
fd_luni
Messages: 66
Registered: January 2013
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Member |
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Hi all
I have a question about integration.
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).
Cheers
M
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| Re: Integration [message #83344 is a reply to message #83200] |
Wed, 20 February 2013 10:20  |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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On Wednesday, February 20, 2013 12:00:32 PM UTC-5, fd_...@mail.com wrote:
> Hi all
>
>
>
> I have a question about integration.
>
>
>
> 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).
DERIV works on tabulated data. The inverse of DERIV for tabulated data is INT_TABULATED(). This may or may not be a good approximation to the integral depending on the shape of the function.
If you have a Y as a function of X, then you can use more advanced integrators like QROMB or QSIMP, or my own QPINT1D.
Craig Markwardt
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