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From: Eli Melaas on 9 Jun 2010 17:05
I am trying to use the lsqcurvefit function as such:

M.file - "Phenocam"
xdata = [0.9 1.5 13.8 19.8 24.1 28.2 35.2 60.3 74.6 81.3];
ydata = [455.2 428.6 124.1 67.3 43.2 28.1 13.1 -0.4 -1.3 -1.5];
x0 = [100; -1]; % Starting guess
[x,resnorm] = lsqcurvefit(@my_fun_Phenocam,x0,xdata,ydata);

M.file - "my_fun_Phenocam"
function F = my_fun_Phenocam(x,xdata)
F = x(1)*exp(x(2)*xdata);

.......and I am consistently getting the following error message:
??? Error using ==> feval
Undefined function or method 'my_fun_Phenocam' for input arguments of type 'double'.
Error in ==> lsqcurvefit at 209
initVals.F = feval(funfcn_x_xdata{3},xCurrent,XDATA,varargin{:});
Caused by:
Failure in initial user-supplied objective function evaluation. LSQCURVEFIT cannot continue.

Any ideas what is wrong with my code?

Thanks!
From: Walter Roberson on 9 Jun 2010 17:07
Eli Melaas wrote:
> I am trying to use the lsqcurvefit function as such:
>
> M.file - "Phenocam"
> xdata = [0.9 1.5 13.8 19.8 24.1 28.2 35.2 60.3 74.6 81.3];
> ydata = [455.2 428.6 124.1 67.3 43.2 28.1 13.1 -0.4 -1.3 -1.5];
> x0 = [100; -1]; % Starting guess
> [x,resnorm] = lsqcurvefit(@my_fun_Phenocam,x0,xdata,ydata);
>
> M.file - "my_fun_Phenocam"
> function F = my_fun_Phenocam(x,xdata)
> F = x(1)*exp(x(2)*xdata);
>
> ......and I am consistently getting the following error message:
> ??? Error using ==> feval
> Undefined function or method 'my_fun_Phenocam' for input arguments of
> type 'double'.
> Error in ==> lsqcurvefit at 209
> initVals.F =
> feval(funfcn_x_xdata{3},xCurrent,XDATA,varargin{:});
> Caused by:
> Failure in initial user-supplied objective function evaluation.
> LSQCURVEFIT cannot continue.
>
> Any ideas what is wrong with my code?


Is it possible that your second M file is named

my_fun_Phenocam

with no extension? Or is it named

my_fun_Phenocam.m

?? It needs the .m extension to be found.
From: Eli Melaas on 9 Jun 2010 17:12
Walter Roberson <roberson(a)hushmail.com> wrote in message <huovt9$jr9$1(a)canopus.cc.umanitoba.ca>...
> Eli Melaas wrote:
> > I am trying to use the lsqcurvefit function as such:
> >
> > M.file - "Phenocam"
> > xdata = [0.9 1.5 13.8 19.8 24.1 28.2 35.2 60.3 74.6 81.3];
> > ydata = [455.2 428.6 124.1 67.3 43.2 28.1 13.1 -0.4 -1.3 -1.5];
> > x0 = [100; -1]; % Starting guess
> > [x,resnorm] = lsqcurvefit(@my_fun_Phenocam,x0,xdata,ydata);
> >
> > M.file - "my_fun_Phenocam"
> > function F = my_fun_Phenocam(x,xdata)
> > F = x(1)*exp(x(2)*xdata);
> >
> > ......and I am consistently getting the following error message:
> > ??? Error using ==> feval
> > Undefined function or method 'my_fun_Phenocam' for input arguments of
> > type 'double'.
> > Error in ==> lsqcurvefit at 209
> > initVals.F =
> > feval(funfcn_x_xdata{3},xCurrent,XDATA,varargin{:});
> > Caused by:
> > Failure in initial user-supplied objective function evaluation.
> > LSQCURVEFIT cannot continue.
> >
> > Any ideas what is wrong with my code?
>
>
> Is it possible that your second M file is named
>
> my_fun_Phenocam
>
> with no extension? Or is it named
>
> my_fun_Phenocam.m
>
> ?? It needs the .m extension to be found.

Both files do have the ".m" file extension.
From: Walter Roberson on 9 Jun 2010 18:00
Eli Melaas wrote:
> Walter Roberson <roberson(a)hushmail.com> wrote in message
> <huovt9$jr9$1(a)canopus.cc.umanitoba.ca>...
>> Eli Melaas wrote:
>> > I am trying to use the lsqcurvefit function as such:
>> > > M.file - "Phenocam"
>> > xdata = [0.9 1.5 13.8 19.8 24.1 28.2 35.2 60.3 74.6 81.3];
>> > ydata = [455.2 428.6 124.1 67.3 43.2 28.1 13.1 -0.4 -1.3 -1.5];
>> > x0 = [100; -1]; % Starting guess
>> > [x,resnorm] = lsqcurvefit(@my_fun_Phenocam,x0,xdata,ydata);
>> > > M.file - "my_fun_Phenocam"
>> > function F = my_fun_Phenocam(x,xdata)
>> > F = x(1)*exp(x(2)*xdata);
>> > > ......and I am consistently getting the following error message:
>> > ??? Error using ==> feval
>> > Undefined function or method 'my_fun_Phenocam' for input arguments
>> of > type 'double'.
>> > Error in ==> lsqcurvefit at 209
>> > initVals.F = >
>> feval(funfcn_x_xdata{3},xCurrent,XDATA,varargin{:});
>> > Caused by:
>> > Failure in initial user-supplied objective function evaluation. >
>> LSQCURVEFIT cannot continue.
>> > > Any ideas what is wrong with my code?

> Both files do have the ".m" file extension.

Do the files happen to be stored in one of Matlab's installation directories?
If so then "Don't do that", and if you must do that then you would need to use
rehash .

Do the files happen to be stored in different directories? If so then are both
directories on the path?

How are you starting the first file? Positioning to it and pressing F5? If so
then it would write the text to a temporary file and execute that, which is
different than if you were to go to the command line and command

Phenocam

from there -- in the second case it would have to find the function on the
search path.

Have you quit Matlab and restarted since the problem began, in order to
determine whether it might be a problem with Matlab holding on to old versions
of files?
From: Wayne King on 9 Jun 2010 18:34
"Eli Melaas" <eli.melaas(a)gmail.com> wrote in message <huovm7$5v2$1(a)fred.mathworks.com>...
> I am trying to use the lsqcurvefit function as such:
>
> M.file - "Phenocam"
> xdata = [0.9 1.5 13.8 19.8 24.1 28.2 35.2 60.3 74.6 81.3];
> ydata = [455.2 428.6 124.1 67.3 43.2 28.1 13.1 -0.4 -1.3 -1.5];
> x0 = [100; -1]; % Starting guess
> [x,resnorm] = lsqcurvefit(@my_fun_Phenocam,x0,xdata,ydata);
>
> M.file - "my_fun_Phenocam"
> function F = my_fun_Phenocam(x,xdata)
> F = x(1)*exp(x(2)*xdata);
>
> ......and I am consistently getting the following error message:
> ??? Error using ==> feval
> Undefined function or method 'my_fun_Phenocam' for input arguments of type 'double'.
> Error in ==> lsqcurvefit at 209
> initVals.F = feval(funfcn_x_xdata{3},xCurrent,XDATA,varargin{:});
> Caused by:
> Failure in initial user-supplied objective function evaluation. LSQCURVEFIT cannot continue.
>
> Any ideas what is wrong with my code?
>
> Thanks!

Hi Eli, I don't have any problem with this example. Are you trying to run the code:

xdata = [0.9 1.5 13.8 19.8 24.1 28.2 35.2 60.3 74.6 81.3];
ydata = [455.2 428.6 124.1 67.3 43.2 28.1 13.1 -0.4 -1.3 -1.5];
x0 = [100; -1]; % Starting guess
[x,resnorm] = lsqcurvefit(@my_fun_Phenocam,x0,xdata,ydata);

inside of the function defined by:

function F = my_fun_Phenocam(x,xdata)
F = x(1)*exp(x(2)*xdata);

?? You should save this:

function F = my_fun_Phenocam(x,xdata)
F = x(1)*exp(x(2)*xdata);

and ONLY that code in a file called my_fun_Phenocam.m and make sure you save it in a directory that is Matlab's path. Let's save you have a directory c:\mfiles, or /user/mfiles. Save my_fun_Phenocam.m with just the above two lines of code in that directory and then add that to the Matlab path

>>addpath 'c:\mfiles' % or addpath '/user/mfiles'

Then run:

xdata = [0.9 1.5 13.8 19.8 24.1 28.2 35.2 60.3 74.6 81.3];
ydata = [455.2 428.6 124.1 67.3 43.2 28.1 13.1 -0.4 -1.3 -1.5];
x0 = [100; -1]; % Starting guess
[x,resnorm] = lsqcurvefit(@my_fun_Phenocam,x0,xdata,ydata);

at the Matlab command prompt.

Hope that helps,
Wayne
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