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Diffstat (limited to 'macros/ifht.sci')
| -rw-r--r-- | macros/ifht.sci | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/macros/ifht.sci b/macros/ifht.sci index aacbd7a..7f865cb 100644 --- a/macros/ifht.sci +++ b/macros/ifht.sci @@ -1,4 +1,22 @@ 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) |