TSparseMtx.PixelDownSample Method

Summary

Reduces dense matrix for screen display (bitmap) to show the non-zero pattern.

Declaration

Procedure PixelDownSample(Dst: TMtx; Pixels: integer = 500; Mode: TPixelDownSample = pdsPattern);

Description

Creates a reduced size Dst dense matrix for screen display (bitmap) to show the non-zero pattern. Pixels parameter defines the target number of pixels to reduce Rows and Cols to. The Mode parameter defines how reduced matrix will be constructed.

See Also
TPixelDownSample

Example 1

          Uses MtxExpr, Sparse, MtxVecTee;

          var SparseA: TSparseMtx;
            GridSeries: TMtxGridSeries;
            v1,v2: Vector;
            A: Matrix;
          begin
            // ...
            SparseA.Size(7500,4000,4000,false);
            SparseA.RandomSparse(v1,v2);
            SparseA.PixelDownSample(A);
            DrawValues(A,GridSeries); // showing A
          end;

          Vector v1,v2;
          Matrix A;
          TSparseMtx *SparseA;
          // ...
          SparseA->Size(7500,4000,4000,false);
          SparseA->RandomSparse(v1,v2);
          SparseA->PixelDownSample(A);
          DrawValues(A,GridSeries); // showing A

          Vector v1 = new Vector(0);
          Vector v2 = new Vector(0);
          Matrix A = new Matrix(0,0);
          TSparseMtx SparseA = new TSparseMtx();
          // ...
          SparseA.Size(7500,4000,4000,false);
          SparseA.RandomSparse(v1,v2);
          SparseA.PixelDownSample(A);
          TeeChart.DrawValues(A,GridSeries); // showing A