You are here: Symbol Reference > Dew Namespace > Dew.Math Namespace > Classes > TVec Class > TVec Methods > DCT Method > TVec.DCT Method ()
Dew Math for .NET
ContentsIndexHome
PreviousUpNext
TVec.DCT Method ()
TVec Class  TVec Members  Dew.Math Namespace  DCT Method  Example  See Also
Collapse All

The forward discrete cosine transform (DCT).

Syntax
C#
Visual Basic
public TVec DCT();
Remarks

Calculates the forward discrete cosine transform (DCT) of all calling vector elements in-place. If vector Length is a power of 2, the function uses an efficient algorithm that is significantly faster than the direct computation of DCT. For different lengths this function uses the direct formulas given below; however, the symmetry of cosine function is taken into account, which allows to perform about half of the multiplication operations in the formulas. In the following definition of DCT, N=Vec.Length and V is the calling vector: 

 

 

See Also
Example
var a,b: TVec; begin CreateIt(a,b); a.SetIt(False,[1,-2,3,4]); b.DCT(a); FreeIt(a,b); end;
Group
Links
Copyright (c) 1999-2024 by Dew Research. All rights reserved.
Contents | Index | Home
What do you think about this topic? Send feedback!