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MPFIT parameter errors -0.00000 [message #75989]

Mon, 09 May 2011 13:35

Eoj
Messages: 7
Registered: June 2010

Junior Member

Hello,

I was wondering about something strange that seems to be going on
with MPFIT in IDL. MPFIT seems to be working and producing a fine
looking fit, but the errors on some of the parameters are identically
-0.00000. These parameters are not limited or tied to anything at the
moment, so they should be producing some parameter error. Output is
attached below, MPFIT is ending with a "2" status. Any idea what is
going on here? This only seems to happen for a specific data file, for
other fits it seems to be working fine.

Cheers,
Joe

IDL>
% MPFIT: WARNING: data is DOUBLE but parameters are FLOAT
% MPFIT: (converting parameters to DOUBLE)
Iter 1 CHI-SQUARE = 148.65044 DOF = 99
P(0) = 2.70126E+16
P(1) = 2.02481E+16
P(2) = 32.2569
P(3) = 37.7481
P(4) = 0.000100000
P(5) = 71.0903
P(6) = 0.273900
P(7) = 0.273900
P(8) = 930.748
P(9) = 930.748
Iter 1 CHI-SQUARE = 148.65044 DOF = 99
P(0) = 2.70126E+16
P(1) = 2.02481E+16
P(2) = 32.2569
P(3) = 37.7481
P(4) = 0.000100000
P(5) = 71.0903
P(6) = 0.273900
P(7) = 0.273900
P(8) = 930.748
P(9) = 930.748

STATUS
2

PERROR
-0.00000 -0.00000 0.492911 1.38439 0.00000
0.930223 0.00000
0.00000 0.00000 0.00000

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[Message index]

		MPFIT parameter errors -0.00000 By: Eoj on Mon, 09 May 2011 13:35
		Re: MPFIT parameter errors -0.00000 By: Craig Markwardt on Thu, 12 May 2011 20:45
		Re: MPFIT parameter errors -0.00000 By: Eoj on Thu, 12 May 2011 10:32
		Re: MPFIT parameter errors -0.00000 By: Eoj on Thu, 12 May 2011 10:14
		Re: MPFIT parameter errors -0.00000 By: Craig Markwardt on Thu, 12 May 2011 07:31

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