how to set up a function involving integrals integral bounds

Question

Maggie liu 2021-7-29

评论： Maggie liu 2021-8-2

I'm trying to set up a function that looks like

where a is a constant.

how can I do this? when I try using the following code, it tells me that "Limits of integration must be double or single scalars."

Many thanks!

syms f(x)
f(x) = integral(fun,a,x);

Answer 1

Steven Lord 2021-7-29

The integral function is for numeric integration.

The int function is for symbolic integration.

Maggie liu 2021-7-30

I'm still a bit confused...I looked up the documentation on int function, and just to test it out I tried the following sample code

syms x
f = cos(x)/sqrt(1 + x^2);
Fint = int(f,x,[0 10])

and got the this error message

Error using symfun/subsref (line 189)

Invalid argument at position 2. Symbolic function expected 1 input arguments but received 3.

Thanks for your help!

Maggie liu 2021-8-2

I re-installed the symbolic math add on and it worked