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use direct array access where possible 

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@729172 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Luc Maisonobe 2008-12-23 23:25:31 +00:00
parent a20be3af18
commit 13583c53fa
1 changed files with 45 additions and 39 deletions
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84
src/java/org/apache/commons/math/linear/AbstractRealMatrix.java
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@ -606,28 +606,30 @@ public abstract class AbstractRealMatrix implements RealMatrix, Serializable {
/** {@inheritDoc} */
public RealVector operate(final RealVector v)
throws IllegalArgumentException {
final int nRows = getRowDimension();
final int nCols = getColumnDimension();
if (v.getDimension() != nCols) {
throw MathRuntimeException.createIllegalArgumentException("vector length mismatch:" +
" got {0} but expected {1}",
new Object[] {
v.getDimension(), nCols
});
}
final double[] out = new double[nRows];
for (int row = 0; row < nRows; ++row) {
double sum = 0;
for (int i = 0; i < nCols; ++i) {
sum += getEntry(row, i) * v.getEntry(i);
try {
return new RealVectorImpl(operate(((RealVectorImpl) v).getDataRef()), false);
} catch (ClassCastException cce) {
final int nRows = getRowDimension();
final int nCols = getColumnDimension();
if (v.getDimension() != nCols) {
throw MathRuntimeException.createIllegalArgumentException("vector length mismatch:" +
" got {0} but expected {1}",
new Object[] {
v.getDimension(), nCols
});
}
out[row] = sum;
final double[] out = new double[nRows];
for (int row = 0; row < nRows; ++row) {
double sum = 0;
for (int i = 0; i < nCols; ++i) {
sum += getEntry(row, i) * v.getEntry(i);
}
out[row] = sum;
}
return new RealVectorImpl(out, false);
}
return new RealVectorImpl(out, false);
}
/** {@inheritDoc} */
@ -660,28 +662,32 @@ public abstract class AbstractRealMatrix implements RealMatrix, Serializable {
/** {@inheritDoc} */
public RealVector preMultiply(final RealVector v)
throws IllegalArgumentException {
try {
return new RealVectorImpl(preMultiply(((RealVectorImpl) v).getDataRef()), false);
} catch (ClassCastException cce) {
final int nRows = getRowDimension();
final int nCols = getColumnDimension();
if (v.getDimension() != nRows) {
throw MathRuntimeException.createIllegalArgumentException("vector length mismatch:" +
" got {0} but expected {1}",
new Object[] {
v.getDimension(), nRows
});
}
final double[] out = new double[nCols];
for (int col = 0; col < nCols; ++col) {
double sum = 0;
for (int i = 0; i < nRows; ++i) {
sum += getEntry(i, col) * v.getEntry(i);
final int nRows = getRowDimension();
final int nCols = getColumnDimension();
if (v.getDimension() != nRows) {
throw MathRuntimeException.createIllegalArgumentException("vector length mismatch:" +
" got {0} but expected {1}",
new Object[] {
v.getDimension(), nRows
});
}
out[col] = sum;
final double[] out = new double[nCols];
for (int col = 0; col < nCols; ++col) {
double sum = 0;
for (int i = 0; i < nRows; ++i) {
sum += getEntry(i, col) * v.getEntry(i);
}
out[col] = sum;
}
return new RealVectorImpl(out);
}
return new RealVectorImpl(out);
}
/** {@inheritDoc} */