How to add integral in a integral function

I need to add an complex integral inside of a integral function like this:

integral(@(x)sin(integral(@(a)sin(a),0,x)),0,1)

However, it turns out to be an error with message: “Limits of integration must be double or single scalars.”

P.S. My function is much complex than 'sin(x)', here just is an example.

How to solve this?

Answer 1

[Torsten]

format long
integral(@(x)sin(integral(@(a)sin(a),0,x)),0,1,'ArrayValued',true)

ans = 
   0.156096097878724

integral(@(x)sin(1-cos(x)),0,1)

ans = 
   0.156096097878724

[Haozhe Zhang]

Thank you, that works.