Fitgammademo error

1
Don't mean to be a pest. As I work through different demos and functions,
learning the tools, I keep running into occasional errors. Here's another:

»fitgammademo
Fitting with simple power function
??? Undefined function or variable 'constr'.

Error in ==> RRL cchase:MATLAB
5:Toolbox:Psychtoolbox:PsychGamma:FitGammaPow.m
On line 14 ==> x =
constr('FitGammaPowFun',x0,options,[],[],[],values_in,measurements);

Error in ==> RRL cchase:MATLAB 5:Toolbox:Psychtoolbox:PsychGamma:FitGamma.m
On line 66 ==> [fit_out1(:,i),x1(:,i),error(1,i)] = ...

Error in ==> RRL cchase:MATLAB
5:Toolbox:Psychtoolbox:PsychDemos:FitGammaDemo.m
On line 40 ==> [simpleFit,simpleX] =
FitGamma(typicalGammaInput,typicalGammaData,output,1);


--
Chris Chase, Ph.D.
Associate Professor of Psychology
Claremont McKenna College
850 Columbia Ave.
Claremont, CA 91711

909.607.3668 (office)
909.621.8419 (FAX)
chris.chase@...