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Patch to correct error in matrix multiply 

and the addition od toString method.


git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/math/trunk@141045 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Mark R. Diggory 2003-11-23 20:16:17 +00:00
parent 4fc6b5e54e
commit b84b723efa
1 changed files with 26 additions and 6 deletions
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30
src/java/org/apache/commons/math/linear/RealMatrixImpl.java
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@ -78,7 +78,7 @@ import java.io.Serializable;
* explicitly invoke <code>LUDecompose()</code> to recompute the decomposition
* before using any of the methods above.
*
* @version $Revision: 1.8 $ $Date: 2003/11/14 22:22:19 $
* @version $Revision: 1.9 $ $Date: 2003/11/23 20:16:17 $
*/
public class RealMatrixImpl implements RealMatrix, Serializable {
@ -263,15 +263,15 @@ public class RealMatrixImpl implements RealMatrix, Serializable {
("Matrices are not multiplication compatible.");
}
int nRows = this.getRowDimension();
int nCols = this.getColumnDimension();
int nCols = m.getColumnDimension();
int nSum = this.getColumnDimension();
double[][] mData = m.getData();
double[][] outData =
new double[nRows][nCols];
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 < nCols; i++) {
for (int i = 0; i < nSum; i++) {
sum += data[row][i] * mData[i][col];
}
outData[row][col] = sum;
@ -720,6 +720,26 @@ public class RealMatrixImpl implements RealMatrix, Serializable {
}
}
/**
*
* @see java.lang.Object#toString()
*/
public String toString() {
StringBuffer res = new StringBuffer();
res.append("RealMatrixImpl{");
for (int i=0; i<data.length; i++) {
if (i>0) res.append(",");
res.append("{");
for (int j=0; j<data[0].length; j++) {
if (j>0) res.append(",");
res.append(data[i][j]);
}//for
res.append("}");
}//for
res.append("}");
return res.toString();
}//toString
//------------------------ Protected methods
/**