Problem on using datafit

[Paul CARRICO]

All,

 

For the first time I'm trying to fit experimental data with a constitutive
equation . the final result is not good if I compare with gnuplot for
example !

 

I'm doing something wrong but what ?

 

NOTA :  I would like to use datafit to be able to surround/constraint  the
parameter values (all the parameters must be strictly positive here)

 

 

With gnuplot I found :

C10 = 0.684101         

C01 = -0.018344   

(have a look in the screenshot)

 

 

Tanks for any help

 

Regards

 

PC

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