Substituting many symbolic variables with one vector to create function handle

Hello,

I am generating a symbolic function (which is very long) through multiple steps. To make my question easy, let's say i have:

syms B C
sym A(B,C)
A = B + C

for further computation I need to transform the symbolic function into a function handle of the form:

f = @(x) x(1)+x(2)

But I generally fail to do this. I tried different methods and I got as far as f = @(x1,x2) x1+x2

which is of course different.

How may I accomplish this task?

Thank you

Answer 1

[Andrei Bobrov]

syms B C 

f = matlabFunction(B + C,'vars',{[B C]});

[David]

This works great!

[Thana Chut]

Thanks for sharing this

Answer 2

[Walter Roberson]

Use an auxiliary function

function r = spreadargs(x, fhandle)
  t = num2cell(x);
  r = fhandle(t{:});
end

then when

f = matlabFunction(EXPRESSION, 'vars', {ListOfVariables});

invoke (e.g.)

fmincon( @(x) spreadargs(x, f), ....)