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Diffstat (limited to 'macros/fwht.sci')
| -rw-r--r-- | macros/fwht.sci | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/macros/fwht.sci b/macros/fwht.sci index 280bbee..e0a15ff 100644 --- a/macros/fwht.sci +++ b/macros/fwht.sci @@ -1,4 +1,28 @@ function y = fwht(x, varargin) +//Compute the Walsh-Hadamard transform of x using the Fast Walsh-Hadamard Transform (FWHT) algorithm +//Calling Sequence +//fwht (x) +//fwht (x, n) +//fwht (x, n, order) +//Parameters +//x: real or complex valued scalar or vector +//n: x is truncated or extended to have length n +//order: Specification of order in which coefficients should be arranged +//Description +//Compute the Walsh-Hadamard transform of x using the Fast Walsh-Hadamard Transform (FWHT) algorithm. If the input is a matrix, the 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 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); |