Discrete Hankel Transforms

# Title: Discrete Hankel Transforms

## 1 Class Methods

`GSL::Dht.new(size)`
`GSL::Dht.new(size, nu, xmax)`
`GSL::Dht.alloc(size)`
`GSL::Dht.alloc(size, nu, xmax)`
  These methods allocate a Discrete Hankel transform object `GSL::Dht` of size size. If three arguments are given, the object is initialized with the values of nu, xmax.

## 2 Methods

`GSL::Dht#init(nu, xmax)`
  This initializes the transform self for the given values of nu and xmax.
`GSL::Dht#apply(vin, vout)`
`GSL::Dht#apply(vin)`
  This applies the transform self to the vector vin whose size is equal to the size of the transform.
`GSL::Dht#x_sample(n)`
  This method returns the value of the n'th sample point in the unit interval, (j_{nu,n+1}/j_{nu,M}) X. These are the points where the function f(t) is assumed to be sampled.
`GSL::Dht#k_sample(n)`
  This method returns the value of the n'th sample point in "k-space", j_{nu,n+1}/X.

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