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idct

PURPOSE ^

% y = dct (x, n)

SYNOPSIS ^

function y = idct (x, n)

DESCRIPTION ^

% y = dct (x, n)
%    Computes the inverse discrete cosine transform of x.  If n is
%    given, then x is padded or trimmed to length n before computing
%    the transform. If x is a matrix, compute the transform along the
%    columns of the the matrix. The transform is faster if x is
%    real-valued and even length.
%
% The inverse discrete cosine transform x of X can be defined as follows:
%
%          N-1
%   x[n] = sum w(k) X[k] cos (pi (2n-1) k / 2N ),  k = 0, ..., N-1
%          k=0
%
% with w(0) = sqrt(1/N) and w(k) = sqrt(2/N), k = 1, ..., N-1
%
% See also: idct, dct2, idct2, dctmtx

CROSS-REFERENCE INFORMATION ^

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