Re: Most elegant way to pass parameters to functions that are used as handles?

[Markus Appel]

On 07/15/2015 10:14 PM, rocketsound wrote:
> For example take the fmincon function (currently only awailable in Matlab) 
> doc fmincon <http://de.mathworks.com/help/optim/ug/fmincon.html>  . It takes
> two handles: one for the objective function and one for the constraints.
> 
> I'm curious about what you think is the most clean and efficient way to pass
> parameters I use in those functions used as handles.
> 
> At the moment I'm stuck with two solutions:
> 1) Use global variables, a very bad solution
> 2) Use nested functions, but because of the odd scoping rules I have to
> declare all variables I use like in the good old C times and I somehow
> dislike this
> 3) ?
> 

How about anonymous functions, as also suggested in the mathworks link?

> x = fmincon(@(x)norm(x)^2,x0,A,b);

You can use it to wrap any function and pass variables from the current
scope:

> par1 = 42;
> par2 = "anything";
> x = fmincon( @(x) my_obj_fun(x,par1,par2), x0, A, b);