Tricomi Function (Not in Base Package)

Computes the Tricomi, or associated confluent hypergeometric, function. Details  

	x is the input argument.
	a is the first parameter of the Tricomi function.
	b is the second parameter of the Tricomi function.
	U(x, a, b) returns the value of the Tricomi function.

Tricomi Function Details

The Tricomi function U(x, a, b) is a solution of the following differential equation.