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Error " Undefined function 'minus' for input arguments of type 'cell'

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Steve
Steve 2015-3-3
编辑： per isakson 2015-3-3
Hi,
When I try to select the option ' Search how to include regressors in the nonlinear block ' using the system identification tool box i get the error ' undefined function 'minus' for input arguments of type 'cell' '
Maybe I wrote the custom regressors badly ?
Here they are :
c2 = customreg(@(x)((x>1.3) || (x<-0.5))*x,{'u1'},0);
c1 = customreg(@(x)max(min(x,111.5),-104.3),{'y1'},1);
Please help me,
Stevi

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