| Re: Gamma Variate Curve Fitting [message #35496] |
Thu, 19 June 2003 06:55 |
faeriepunk
Messages: 6
Registered: May 2003
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Junior Member |
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Craig Markwardt <craigmnet@cow.physics.wisc.edu> wrote in message news:<ond6hbtn6c.fsf@cow.physics.wisc.edu>...
> "Andy Meigs" <ameigs@jet.uk> writes:
>
>> And I would like to cast 7 or votes in the ballot for Craig on behalf of my
>> group at JET. Several of us use mpfit every day.
>
> Thanks, folks. It's really nice to get those compliments.
>
> Alas, my "paying" job takes me away from IDL alot these days but I
> still pay attention to the newsgroup. I've gotten some feature
> requests in the past few weeks/months (thanks Kristian), which I hope
> to act on when I have more time.
>
> Yours,
> Craig
Thanks Everyone,
Thanks to MPFIT my problems for the most part have been solved! The
U of T MR group thanks you Craig!
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| Re: Gamma Variate Curve Fitting [message #35506 is a reply to message #35496] |
Wed, 18 June 2003 08:34  |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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"Andy Meigs" <ameigs@jet.uk> writes:
> And I would like to cast 7 or votes in the ballot for Craig on behalf of my
> group at JET. Several of us use mpfit every day.
Thanks, folks. It's really nice to get those compliments.
Alas, my "paying" job takes me away from IDL alot these days but I
still pay attention to the newsgroup. I've gotten some feature
requests in the past few weeks/months (thanks Kristian), which I hope
to act on when I have more time.
Yours,
Craig
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| Re: Gamma Variate Curve Fitting [message #35510 is a reply to message #35506] |
Wed, 18 June 2003 02:20 |
Andrew Meigs
Messages: 8
Registered: November 2000
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Junior Member |
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And I would like to cast 7 or votes in the ballot for Craig on behalf of my
group at JET. Several of us use mpfit every day.
Andy
"Rob Dimeo" <robert.dimeo@nist.gov> wrote in message
news:cb539436.0306161341.b009c4c@posting.google.com...
> Paul van Delst <paul.vandelst@noaa.gov> wrote in message
news:<3EEDF93F.25F040A2@noaa.gov>...
>>
>> If I sound gushy about the MPFIT stuff it's because I am - using that
code saved me monthS
>> of work, and I'm not exaggerating.
>>
>> I hereby nominate Craig and his software for a special award for
services to the
>> school...I mean, the IDL community. :o)
>
> I absolutely positively concur and second this nomination! His MPFIT
> routines have certainly made my life much easier.
>
> Keep up the great work Craig!
>
> Rob
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| Re: Gamma Variate Curve Fitting [message #35514 is a reply to message #35510] |
Mon, 16 June 2003 14:41 |
robert.dimeo
Messages: 42
Registered: November 2001
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Member |
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Paul van Delst <paul.vandelst@noaa.gov> wrote in message news:<3EEDF93F.25F040A2@noaa.gov>...
>
> If I sound gushy about the MPFIT stuff it's because I am - using that code saved me monthS
> of work, and I'm not exaggerating.
>
> I hereby nominate Craig and his software for a special award for services to the
> school...I mean, the IDL community. :o)
I absolutely positively concur and second this nomination! His MPFIT
routines have certainly made my life much easier.
Keep up the great work Craig!
Rob
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| Re: Gamma Variate Curve Fitting [message #35515 is a reply to message #35514] |
Mon, 16 June 2003 10:07 |
Paul Van Delst[1]
Messages: 1157
Registered: April 2002
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Senior Member |
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Kate wrote:
>
> I have been trying for a week now to fit data to a gamma variate curve
> using the curve fitting algorithms built into IDL. Every time I use
> CurveFit it tells me my data does not converge and every time I use
> SVDFIT my program crashes and exits out of IDL automatically! I made
> sure that my inital guesses were VERY close to the actual test data I
> am using and I'm still stuck. Does anyone have any experience fitting
> this type of non-linear curve using IDL? If I was using anything else
> I would probably use the simplex method but there doesnt' seem to be a
> downhill simplex curve fitting algorithm in IDL. HELP!!!
Go to Craig Markwardt's website and download his MPFIT fitting library:
http://cow.physics.wisc.edu/~craigm/idl/fitting.html
I had a similar problem recently (and I was just fitting a relatively simple polynomial
[non-integer exponents] but I tried all the usual suspects) and when I simply replaced
IDL's CURVEFIT with Craig's MPCURVEFIT all my problems went away...literally. Where
CURVEFIT didn't converge, the MPFIT equivalent did. And where CURVEFIT did converge, the
MPFIT equivalent gave me a better fit! And when I really screwed up the initial fit
coefficient guesses and MPCURVEFIT didn't converge, I got meaningful error output that
allowed me to fix the problem.
If I sound gushy about the MPFIT stuff it's because I am - using that code saved me monthS
of work, and I'm not exaggerating.
I hereby nominate Craig and his software for a special award for services to the
school...I mean, the IDL community. :o)
paulv
--
Paul van Delst
CIMSS @ NOAA/NCEP/EMC
Ph: (301)763-8000 x7748
Fax:(301)763-8545
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