Using Matlab:

6. Write and test a function double(x) which doubles its input argument. 7. Write and test a function combine(x,y) which concatenates the two arguments into one vector 8. Write your own function to compute the exponential function directly from the Taylor series: 2 3 2! 3! The series should end when the last term is less than 10-6. Test your function against the built-in function exp, but be careful not to make x too large this can cause rounding error