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 function m = ifht(d, varargin)
+//Calculate the inverse Fast Hartley Transform of real input D
+//Calling Sequence
+//m= ifht (d)
+//m= ifht (d,n)
+//m= ifht (d,n,dim)
+//Parameters 
+//d: real or complex valued scalar or vector
+//n: Similar to the options of FFT function
+//dim: Similar to the options of FFT function 
+//Description
+//Calculate the inverse Fast Hartley Transform of real input d. If d is a matrix, the inverse Hartley transform is calculated along the columns by default. The options n and dim are similar to the options of FFT function.
+//
+//The forward and inverse Hartley transforms are the same (except for a scale factor of 1/N for the inverse hartley transform), but implemented using different functions.
+//
+//The definition of the forward hartley transform for vector d, m[K] = 1/N \sum_{i=0}^{N-1} d[i]*(cos[K*2*pi*i/N] + sin[K*2*pi*i/N]), for 0 <= K < N. m[K] = 1/N \sum_{i=0}^{N-1} d[i]*CAS[K*i], for 0 <= K < N.
+//Examples
+//ifht(1 : 4)
+//ifht(1:4, 2)
 funcprot(0);
 rhs= argn(2);
 if(rhs<1 | rhs>3)