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TDenseMtxVec.DCT Method
TDenseMtxVec Class  TDenseMtxVec Members  Dew.Math Namespace  TDenseMtxVec Methods  Example  See Also
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The forward discrete cosine transform (DCT).

Syntax
C#
Visual Basic
public TMtxVec DCT([In] TMtxVec Vec, int VecIndex, int Index, int Len);
Remarks

Calculates the forward discrete cosine transform (DCT) of the Vec and writes the result in the calling vector. If Vec.Length is a power of 2, the function uses an efficient algorithm that is significantly faster than the direct computation of DCT. For other values of Vec Length, 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
using Dew.Math; using Dew.Math.Units; namespace Dew.Examples() { void Example() { TVec a,b; MtxVec.CreateIt(out a, out b); try { a.SetIt(false,new double[] {1,-2,3,4}); b.DCT(a); } finally { MtxVec.FreeIt(ref a,ref b); } } }
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