Debugging a code for fitting an anonymous function

Marco Uzielli

2015 8 17

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Hi,

I wrote the following code to estimate model parameters A and B while fitting dependent data IR to independent data Ipar. IRmax is a problem coefficient, to which I assigned unit value.

IRmax=1;
Ipar=[0.4 1 1.6]'
IR=[0.02 0.65 0.95]'
ftype=fittype(@(A,B,IRmax,Ipar) IRmax.*(1-exp(Ipar./A).^B),'problem','IRmax','independent','Ipar','dependent','IR')
IRfit=fit(Ipar,IR,ftype,'problem',IRmax,'StartPoint',[1,1])

When I run the script, I obtain the following error message:

Undefined operator '==' for input arguments of type 'cell'.
- Error in strncmp (line 16)
m = all( a(1:n) == b(1:n) );
- Error in fit>iParseOptionalArgs (line 968)
ind = find( strncmp( 'p', varargin(1:2:end), 1 ) );
-Error in fit (line 105)
[useroptions, useroptargs, probparams] = iParseOptionalArgs( varargin{:} );
- Error in IR_calibrate (line 7)
IRfit=fit(Ipar,IR,ftype,'problem',IRmax,'StartPoint',[1,1])