How to create a syms vector

1 view (last 30 days)
Steven on 13 May 2020
Commented: Steven on 13 May 2020
How do I generate symbolic variables that I can put into a fminsearch function?
x = sym('x', [1 2]);
fun1 = 4*x(1)^2+3*x(2)+2
myfun = matlabFunction(fun1,'Vars',x);
[xout,fval,exitflag,output] = fminsearch(myfun,[1 ,2])
I tried the code above, however myfun ends up being a function of two variables x1 and x2
@(x1,x2) x2.*3.0 + x1.^2.*4.0 + 2.0
So I have to rewrite the function by hand because I don't know how to generate a symbolic function that looks like this
x(1) x(2)
So I end up rewriting the function
@(x) x(2).*3.0+x(1).^2.*4.0+2.0
and this works
myfun2 =@(x) x(2).*3.0+x(1).^2.*4.0+2.0
[xout,fval,exitflag,output] = fminsearch(myfun2,[1 ,2])
So How do I generate a symbolic vector of x that can allow me to turn fun1 into myfun2

Accepted Answer

Walter Roberson
Walter Roberson on 13 May 2020
x = sym('x', [1 2]);
fun1 = 4*x(1)^2+3*x(2)+2
myfun = matlabFunction(fun1,'Vars',{x}); %small difference from what you had
[xout,fval,exitflag,output] = fminsearch(myfun,[1 ,2])
  1 Comment
Steven on 13 May 2020
Amazing what curly braces will do, Thanks

Sign in to comment.

More Answers (0)





Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!