Undefined function or method 'fprefcnchk'

Hi all,

I am attempting to use a function fitting script provided by a coleague (to fit log-normal fits to data). This script was likely developed in a version of Matlab prior to 7 whilst I am using R2008a. When I run the script I come across an error which I can find very little information on across the web- I fear it may be a depreciated function from either the optimise or statisitics toolbox (both of which I have). In detail the error and usage is as follows:

??? Undefined function or method 'fprefcnchk' for input arguments of type
'char'.

Error in ==> alter at 207
   [funfcn, msg] =
   fprefcnchk(FUN,'fmincon',length(varargin),gradflag,hessflag);

Error in ==> fitting_3 at 23
    [Estimates]=alter('lognorm3',Starting,[], [],[],[],
    lowerbounds,upperbounds,[], options,t,Data) ;

Any advice or help would be great.

Answer 1

[Walter Roberson]

At some point at least, it was in the optimization toolbox.

http://www.mathworks.com/matlabcentral/newsreader/view_thread/128890

It looks to me as if "alter" might be a user-written function rather than something provided by Mathworks. I suggest you try

edit alter

and look at the beginning for copyrights and such, and possibly for comments saying something like, "this was adapted from..."