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function y= ifwht(x, varargin)
// Compute the inverse Walsh-Hadamard transform of x using the Fast Walsh-Hadamard Transform (FWHT) algorithm
// Calling Sequence
// ifwht (x)
// ifwht (x, n)
// ifwht (x, n, order)
//Parameters
//x: real or complex valued scalar or vector
//n: Input is truncated or extended to have a length of n
//order: Specifies the order in which the returned inverse Walsh-Hadamard transform
//Description
//Compute the inverse Walsh-Hadamard transform of x using the Fast Walsh-Hadamard Transform (FWHT) algorithm. If the input is a matrix, the inverse FWHT is calculated along the columns of x.
//The number of elements of x must be a power of 2; if not, the input will be extended and filled with zeros. If a second argument is given, the input is truncated or extended to have length n.
//The third argument specifies the order in which the returned inverse Walsh-Hadamard transform coefficients should be arranged. The order may be any of the following strings:
//
//"sequency"
//The coefficients are returned in sequency order. This is the default if order is not given.
//
//"hadamard"
//The coefficients are returned in Hadamard order.
//
//"dyadic"
//The coefficients are returned in Gray code order.
funcprot(0);
rhs= argn(2);
if(rhs<1 | rhs>3)
error("Wrong number of input arguments")
end
select(rhs)
case 1 then
y= callOctave("ifwht", x);
case 2 then
y= callOctave("ifwht", x, varargin(1));
case 3 then
y= callOctave("ifwht", x, varargin(1), varargin(2));
end
endfunction
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