Evaluate Matlab symbolic function

Question

I have a problem with symbolic functions. I am creating function of my own whose first argument is a string. Then I am converting that string to symbolic function:

f =  syms(func)

Lets say my string is sin(x). So now I want to calculate it using subs.

a = subs(f, 1)

The result is sin(1) instead of number.

For 0 it works and calculates correctly. What should I do to get the actual result, not only sin(1) or sin(2), etc.?

Answer 1

You can use also use eval() to evaluate the function that you get by subs() function

f=sin(x);
a=eval(subs(f,1));
disp(a);
a =

    0.8415

Answer 2

syms x
f = sin(x) ;

then if you want to assign a value to x , e.g. pi/2 you can do the following:

subs(f,x,pi/2)
ans =

1