MATLAB: How to plug in x value after I calculate an indefinite integral

Question

For example, I want to get the integral for 1/x, so I wrote

a = int(1/x,x)
a =
log(x)

And then I want to use this function(log(x)). How can I use it?

I have try

f = @x a
f(1)

But it doesn't work.

Answer 1

Hi Jiahui, try

syms x
a = int(1/x,x);
double(subs(a,5))
ans = 1.6094