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Re: Surface fitting image with missing data [message #61902 is a reply to message #61804]

Sun, 03 August 2008 21:52

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

werner.hupfer@googlemail.com writes:

> On 31 Jul., 02:12, jradavenp...@gmail.com wrote:
>> Hey all;
>>
>> I have a 2-D array (essentially an image) with dimensions [n,m]
>>
>> There is a large chunk in a corner of the image with no data. All
>> pixels have values greater than 1, except within this chunk, which =
>> 0.
...
>
> I can highly recommend the library from Craig Markwardt. I use
> mpfitfun for 2D fitting. Among one of the many useful features is the
> ability to do curvefit on data points set to NaN!!!!
>
> http://cow.physics.wisc.edu/~craigm/idl/idl.html

Thanks for the plug!

Actually MPFIT doesn't accept NaNs but probably should. Even so, you
can set the WEIGHTS to zero for your missing data (or equivalently,
the ERRORs to a very large number).

Craig

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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@REMOVEcow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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		Re: Surface fitting image with missing data By: werner.hupfer on Thu, 31 July 2008 01:27
		Re: Surface fitting image with missing data By: Craig Markwardt on Sun, 03 August 2008 21:52

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