Using fit 'exp2' an error with "weights"
9 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I've used the fit function a few times on creep data sets (i.e. time vs displacement) and have been using the 'exp2' fit type. On smaller data sets I've had no problem using this function. Now I'm looking at a 10 folder bigger data set and am getting an error.
I was previously running this and had no problem
[creep_data_fit, gof] = fit(creep_data(1:1800,1),creep_data(1:1800,2), 'exp2')
Now I'm running this and getting the following error
[creep_data_fit, gof] = fit(creep_data(1:10800,1),creep_data(1:10800,2), 'exp2')
Any ideas on why i'm getting this error?
Error using fit>iFit (line 235)
X, Y and WEIGHTS cannot have NaN values.
Error in fit (line 109)
[fitobj, goodness, output, convmsg] = iFit( xdatain, ydatain, fittypeobj, ...
0 commentaires
Réponses (2)
Tom Lane
le 13 Avr 2013
Since you didn't specify weights, it seems like the NaN value must be in either x or y. You can find the usable values (using your own variable names) like this:
t = ~isnan(x) & ~isnan(y);
Then omit the NaN values from the fit:
fit(x(t),y(t),'poly1')
Voir également
Catégories
En savoir plus sur Get Started with Curve Fitting Toolbox dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!