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POget fit data out of gnuplot
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  1. POget fit data out of gnuplot
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    copied!<p>I often use Octave to create data that I can plot from my lab results. That data is then fitted with some function in gnuplot:</p> <pre><code>f1(x) = a * exp(-x*g); fit f1(x) "c_1.dat" using 1:2:3 via a,g </code></pre> <p>That creates a <code>fit.log</code>:</p> <pre><code>******************************************************************************* Tue May 8 19:13:39 2012 FIT: data read from "e_schwach.dat" using 1:2:3 format = x:z:s #datapoints = 16 function used for fitting: schwach(x) fitted parameters initialized with current variable values Iteration 0 WSSR : 12198.7 delta(WSSR)/WSSR : 0 delta(WSSR) : 0 limit for stopping : 1e-05 lambda : 14.2423 initial set of free parameter values mu2 = 1 omega2 = 1 Q2 = 1 After 70 iterations the fit converged. final sum of squares of residuals : 46.0269 rel. change during last iteration : -2.66463e-06 degrees of freedom (FIT_NDF) : 13 rms of residuals (FIT_STDFIT) = sqrt(WSSR/ndf) : 1.88163 variance of residuals (reduced chisquare) = WSSR/ndf : 3.54053 Final set of parameters Asymptotic Standard Error ======================= ========================== mu2 = 0.120774 +/- 0.003851 (3.188%) omega2 = 0.531482 +/- 0.0006112 (0.115%) Q2 = 17.6593 +/- 0.7416 (4.199%) correlation matrix of the fit parameters: mu2 omega2 Q2 mu2 1.000 omega2 -0.139 1.000 Q2 -0.915 0.117 1.000 </code></pre> <p>Is there some way to get the parameters and their error back into Octave? I mean I can write a Python program that parses that, but I hoped to avoid that.</p> <h1>Update</h1> <p>This question is not applicable to me any more, since I use Python and matplotlib for my lab work now, and it can does all this from a single program. I leave this question open in case somebody else has the same problem.</p>
 

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