| Re: Fitting a bolus passage with gamma variate in IDL?? [message #23420 is a reply to message #23231] |
Mon, 22 January 2001 08:56  |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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"Sean Heukels" <sean77=cuthere=@dds.nl> writes:
> Hello all.
>
> Has someone run into having to fit a
> bolus passage through a vein??
> You need a mono-exponential extrapolation fit.
> I heard that gamma variate fit would be the best.
>
> But is there someone out there that did
> something like this and wouldn't mind sharing some knowledge?
> How can this be done in IDL?
> And where do I start?
Hello Sean--
I think few of us on this newsgroup are familiar enough with medical
terminology to provide a competent answer to your question.
However, performing curve fitting is fairly straightforward in IDL.
There are a number of standard library routines (CURVEFIT being the
most popular), and I provide a curve fitting routine on my web page
which is a tad easier to use, and is a bit more stable (MPFIT and
drivers).
You must still provide the fitting function. I thought I understood
what you meant when you said "mono-exponential," but then you go on to
talk about gamma variates. IDL does have a lot of special functions
in its standard library. Suffice to say, if you can provide the
parameterized curve, IDL can fit it.
Craig
P.S. Web page at http://cow.physics.wisc.edu/~craigm/idl/idl.html
--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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