How can I create an ordinary floating point function from a symbolic array

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John Billingham
John Billingham 2017-9-15
评论： John Billingham 2017-9-16
If I have some code that generates a symbolic array, I'd like to be able to turn it into a function that takes floating point inputs.
For example, if f and x are symbolic vectors and p a symbolic variable, and f is
>> disp(f)
[ x1, x2*x3, p + x4, x5, p + x3 + x2*x5 + 1]
I want to be able to use f to generate the MATLAB function
function f = f(x,p)
f(1) = x(1); f(2) = x(2)*x(3); f(3) = x(4)+p; f(4) = x(5); f(5) = x(5)*x(2)+p+1+x(3);
or its equivalent.
I'm very unclear how to do this.
Thanks for your help.

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采纳的回答

Walter Roberson
Walter Roberson 2017-9-15
syms x1 x2 x3 x4 x5 p
f = [ x1, x2*x3, p + x4, x5, p + x3 + x2*x5 + 1]
matlabFunction(f, 'vars', {[x1,x2,x3,x4,x5], p})
ans =
function_handle with value:
@(in1,p)[in1(:,1),in1(:,2).*in1(:,3),p+in1(:,4),in1(:,5),p+in1(:,3)+in1(:,2).*in1(:,5)+1.0]
Note the use of the 'vars' option to group variables into a single input

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