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Passing Functions and m-files to functions

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Linford Briant
Linford Briant 2013-2-12
Hi Mathworks,
I have an m-file which codes up a system of differential equations;
9D_system
This has various parameters in it, and I have a few parameter schemes for specifying the values to these parameters;
P1.m, P2.m, P3.m
I want to be able to specify which parameter scheme I endow the system with, and then solve this system of differential equations with ode15s.
How do I do this?
Moreover, the parameter schemes
P1.m, P2.m, P3.m
each call functions (some of the parameters are functions of other parameters, and so must be calculated by these called functions). Thus the ode will have a series of nested functions being called!!
Any help on this would be greatly appreciated. :)
Linford

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采纳的回答

Sean de Wolski
Sean de Wolski 2013-2-12
@Linford, these are the ways we recommend passing extra parameters:
http://www.mathworks.com/help/releases/R2012b/optim/ug/passing-extra-parameters.html
e.g:
ode45(@(t,y)myfun(t,y,@p1)
And
function x = myfun(t,y,pfun)
stuff = pfun();
x = do_things_with(stuff,t,y)
  1 个评论
Jan
Jan 2013-2-12
编辑：Jan 2013-2-12
Or add the parameters as additional arguments to the anoymous function directly. See also: http://www.mathworks.de/matlabcentral/answers/1971

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更多回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-2-12
f=@P1
f=@P2
José-Luis
José-Luis 2013-2-12
myStr = 'P1.m'
function [result] = myFun(someArg, myStr)
[str str] = fileparts(myStr);
run(str); %calling your script
%Do your thing
  1 个评论
Linford Briant
Linford Briant 2013-2-12
编辑：Linford Briant 2013-2-12
Hi Jose-Luis,
Thanks for this; it works a treat for my parameter functions, but it isn't working for my ODE files. For example, the following is the first 4 lines of a file making my ODE file.
function xprime = 9D_system(t,x,myStr,L)
[str str] = fileparts(myStr);
run(str); %calling your script
%Do your thing
When I call this in MATLAB I get the error:
[t,x] = ode15s(@(t,x) 9D_system(t,x,myStr,0.001),[0 2e6],x0);
??? Input argument "myStr" is undefined.
Even though I have previously defined
myStr='Parameter1.m'

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