/**
* <p>
* Converts matrix data stored is a row major format into a block row major format in place.
* </p>
*
* @param numRows number of rows in the matrix.
* @param numCols number of columns in the matrix.
* @param blockLength Block size in the converted matrix.
* @param data Matrix data in a row-major format. Modified.
* @param workspace Optional internal workspace. Nullable.
*/
public static void convertRowToBlock(int numRows, int numCols, int blockLength,
double[] data, DGrowArray workspace)
{
//int minLength = Math.Min(blockLength, numRows) * numCols;
//double[] tmp = UtilEjml.adjust(workspace, minLength);
//for (int i = 0; i < numRows; i += blockLength)
//{
// int blockHeight = Math.Min(blockLength, numRows - i);
// System.Array.Copy(data, i * numCols, tmp, 0, blockHeight * numCols);
// for (int j = 0; j < numCols; j += blockLength)
// {
// int blockWidth = Math.Min(blockLength, numCols - j);
// int indexDst = i * numCols + blockHeight * j;
// int indexSrcRow = j;
// for (int k = 0; k < blockHeight; k++)
// {
// System.Array.Copy(tmp, indexSrcRow, data, indexDst, blockWidth);
// indexDst += blockWidth;
// indexSrcRow += numCols;
// }
// }
//}
}
/**
* Converts a row major block matrix into a row major matrix. Both matrices will contain
* the same data array. Useful when you wish to avoid declaring two large matrices.
*
* @param src Original DMatrixRBlock. Modified.
* @param dst Equivalent DMatrixRMaj. Modified.
*/
public static DMatrixRMaj convertInplace(DMatrixRBlock src, DMatrixRMaj dst,
DGrowArray workspace)
{
if (dst == null)
{
dst = new DMatrixRMaj();
}
dst.data = src.data;
dst.numRows = src.numRows;
dst.numCols = src.numCols;
convertBlockToRow(src.numRows, src.numCols, src.blockLength, src.data, workspace);
return(dst);
}
/**
* Converts a row major matrix into a row major block matrix. Both matrices will contain
* the same data array. Useful when you wish to avoid declaring two large matrices.
*
* @param src Original DMatrixRMaj. Modified.
* @param dst Equivalent DMatrixRBlock. Modified.
*/
public static DMatrixRBlock convertInplace(DMatrixRMaj src, DMatrixRBlock dst,
DGrowArray workspace)
{
if (dst == null)
{
dst = new DMatrixRBlock();
}
dst.data = src.data;
dst.blockLength = EjmlParameters.BLOCK_WIDTH;
dst.numRows = src.numRows;
dst.numCols = src.numCols;
convertRowToBlock(src.numRows, src.numCols, dst.blockLength, src.data, workspace);
return(dst);
}
public void setTo(DGrowArray original)
{
reshape(original.length2);
System.Array.Copy(original.data, 0, data, 0, original.length2);
}
