Substituting code into function handle

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Hi all. I have a variable myFormula that is a mathematical function of three symbolic variables, a, b, and c. For example, it may be the case that
myFormula = a^2 + b - c/2;
I need to pass this expression into a function handle (I think that is the term, at least), such that my desired result is
thisFunction = @(a,b,c) a^2 + b - c/2;
The problem is that, although myFormula always depends on a, b, and c, the relationship between these variables is arbitrary. To get around this, I have found that
thisFunction = @(a,b,c) subs(myFormula);
is a viable solution. However, thisFunction needs to be passed into ode45 (which constitutes many iterations), which causes subs() to be evaluated thousands of times, making things extremely slow. It seems like there should be a simple solution to this - any suggestions?

Accepted Answer

Walter Roberson
Walter Roberson on 20 Jun 2012
If your formula is in the form of a symbolic expression, as is implied by your use of subs(), then use matlabFunction() to convert the expression into a function handle.
Walter Roberson
Walter Roberson on 20 Jun 2012
Not really, none that would not pretty much end up doing what matlabFunction() does.

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