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Eliminated unecessary copying of external operand's data array in arithmetic

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operations.
PR #31713


git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/math/trunk@141494 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Phil Steitz 2004-11-07 20:19:22 +00:00
parent e2daf5fd17
commit e67ec1e168
2 changed files with 11 additions and 21 deletions
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15
src/java/org/apache/commons/math/linear/BigMatrixImpl.java
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@ -43,7 +43,7 @@ import java.math.BigDecimal;
* As specified in the {@link BigMatrix} interface, matrix element indexing
* is 0-based -- e.g., <code>getEntry(0, 0)</code>
* returns the element in the first row, first column of the matrix.</li></ul>
* @version $Revision: 1.9 $ $Date: 2004/10/25 05:33:24 $
* @version $Revision: 1.10 $ $Date: 2004/11/07 20:19:22 $
*/
public class BigMatrixImpl implements BigMatrix, Serializable {
@ -231,10 +231,9 @@ public class BigMatrixImpl implements BigMatrix, Serializable {
int rowCount = this.getRowDimension();
int columnCount = this.getColumnDimension();
BigDecimal[][] outData = new BigDecimal[rowCount][columnCount];
BigDecimal[][] mData = m.getData();
for (int row = 0; row < rowCount; row++) {
for (int col = 0; col < columnCount; col++) {
outData[row][col] = data[row][col].add(mData[row][col]);
outData[row][col] = data[row][col].add(m.getEntry(row, col));
}
}
return new BigMatrixImpl(outData);
@ -255,10 +254,9 @@ public class BigMatrixImpl implements BigMatrix, Serializable {
int rowCount = this.getRowDimension();
int columnCount = this.getColumnDimension();
BigDecimal[][] outData = new BigDecimal[rowCount][columnCount];
BigDecimal[][] mData = m.getData();
for (int row = 0; row < rowCount; row++) {
for (int col = 0; col < columnCount; col++) {
outData[row][col] = data[row][col].subtract(mData[row][col]);
outData[row][col] = data[row][col].subtract(m.getEntry(row, col));
}
}
return new BigMatrixImpl(outData);
@ -313,14 +311,13 @@ public class BigMatrixImpl implements BigMatrix, Serializable {
int nRows = this.getRowDimension();
int nCols = m.getColumnDimension();
int nSum = this.getColumnDimension();
BigDecimal[][] mData = m.getData();
BigDecimal[][] outData = new BigDecimal[nRows][nCols];
BigDecimal sum = ZERO;
for (int row = 0; row < nRows; row++) {
for (int col = 0; col < nCols; col++) {
sum = ZERO;
for (int i = 0; i < nSum; i++) {
sum = sum.add(data[row][i].multiply(mData[i][col]));
sum = sum.add(data[row][i].multiply(m.getEntry(i, col)));
}
outData[row][col] = sum;
}
@ -915,14 +912,12 @@ public class BigMatrixImpl implements BigMatrix, Serializable {
int nRowB = b.getRowDimension();
// Apply permutations to b
BigDecimal[][] bv = b.getData();
BigDecimal[][] bp = new BigDecimal[nRowB][nColB];
for (int row = 0; row < nRowB; row++) {
for (int col = 0; col < nColB; col++) {
bp[row][col] = bv[permutation[row]][col];
bp[row][col] = b.getEntry(permutation[row], col);
}
}
bv = null;
// Solve LY = b
for (int col = 0; col < nCol; col++) {

17
src/java/org/apache/commons/math/linear/RealMatrixImpl.java
View File

@ -45,7 +45,7 @@ import org.apache.commons.math.util.MathUtils;
* is 0-based -- e.g., <code>getEntry(0, 0)</code>
* returns the element in the first row, first column of the matrix.</li></ul>
*
* @version $Revision: 1.34 $ $Date: 2004/10/25 02:13:22 $
* @version $Revision: 1.35 $ $Date: 2004/11/07 20:19:22 $
*/
public class RealMatrixImpl implements RealMatrix, Serializable {
@ -159,11 +159,10 @@ public class RealMatrixImpl implements RealMatrix, Serializable {
int rowCount = this.getRowDimension();
int columnCount = this.getColumnDimension();
double[][] outData = new double[rowCount][columnCount];
double[][] mData = m.getData();
for (int row = 0; row < rowCount; row++) {
for (int col = 0; col < columnCount; col++) {
outData[row][col] = data[row][col] + mData[row][col];
}
outData[row][col] = data[row][col] + m.getEntry(row, col);
}
}
return new RealMatrixImpl(outData);
}
@ -183,10 +182,9 @@ public class RealMatrixImpl implements RealMatrix, Serializable {
int rowCount = this.getRowDimension();
int columnCount = this.getColumnDimension();
double[][] outData = new double[rowCount][columnCount];
double[][] mData = m.getData();
for (int row = 0; row < rowCount; row++) {
for (int col = 0; col < columnCount; col++) {
outData[row][col] = data[row][col] - mData[row][col];
outData[row][col] = data[row][col] - m.getEntry(row, col);
}
}
return new RealMatrixImpl(outData);
@ -241,14 +239,13 @@ public class RealMatrixImpl implements RealMatrix, Serializable {
int nRows = this.getRowDimension();
int nCols = m.getColumnDimension();
int nSum = this.getColumnDimension();
double[][] mData = m.getData();
double[][] outData = new double[nRows][nCols];
double sum = 0;
for (int row = 0; row < nRows; row++) {
for (int col = 0; col < nCols; col++) {
sum = 0;
for (int i = 0; i < nSum; i++) {
sum += data[row][i] * mData[i][col];
sum += data[row][i] * m.getEntry(i, col);
}
outData[row][col] = sum;
}
@ -667,14 +664,12 @@ public class RealMatrixImpl implements RealMatrix, Serializable {
int nRowB = b.getRowDimension();
// Apply permutations to b
double[][] bv = b.getData();
double[][] bp = new double[nRowB][nColB];
for (int row = 0; row < nRowB; row++) {
for (int col = 0; col < nColB; col++) {
bp[row][col] = bv[permutation[row]][col];
bp[row][col] = b.getEntry(permutation[row], col);
}
}
bv = null;
// Solve LY = b
for (int col = 0; col < nCol; col++) {