Impulsively distributed random number generator

Set of functions used to create a 1-by-N random real vector with impulsive distribution.

With these functions we can generate a impulsively distributed random real vector of length N. The function algorithm uses the following PDF and CDF to build this vector:
PDF: f( x ) = c / ( b - a ) + ( 1 - c ) * d( x ), where d( x ) is the Dirac delta function.
and
CDF: F( x ) = c * ( x - a ) / ( b - a ) + ( 1 - c ) * u( x ), where u( x ) is the step function.