/** test dimensions */
public void testDimensions() {
OpenMapRealMatrix m = createSparseMatrix(testData);
OpenMapRealMatrix m2 = createSparseMatrix(testData2);
assertEquals("testData row dimension", 3, m.getRowDimension());
assertEquals("testData column dimension", 3, m.getColumnDimension());
assertTrue("testData is square", m.isSquare());
assertEquals("testData2 row dimension", m2.getRowDimension(), 2);
assertEquals("testData2 column dimension", m2.getColumnDimension(), 3);
assertTrue("testData2 is not square", !m2.isSquare());
}
/**
* Returns the result of postmultiplying this by m.
*
* @param m matrix to postmultiply by
* @return this * m
* @throws IllegalArgumentException if columnDimension(this) != rowDimension(m)
*/
public OpenMapRealMatrix multiply(OpenMapRealMatrix m) throws IllegalArgumentException {
// safety check
MatrixUtils.checkMultiplicationCompatible(this, m);
final int outCols = m.getColumnDimension();
OpenMapRealMatrix out = new OpenMapRealMatrix(rowDimension, outCols);
for (OpenIntToDoubleHashMap.Iterator iterator = entries.iterator(); iterator.hasNext(); ) {
iterator.advance();
final double value = iterator.value();
final int key = iterator.key();
final int i = key / columnDimension;
final int k = key % columnDimension;
for (int j = 0; j < outCols; ++j) {
final int rightKey = m.computeKey(k, j);
if (m.entries.containsKey(rightKey)) {
final int outKey = out.computeKey(i, j);
final double outValue = out.entries.get(outKey) + value * m.entries.get(rightKey);
if (outValue == 0.0) {
out.entries.remove(outKey);
} else {
out.entries.put(outKey, outValue);
}
}
}
}
return out;
}
/** test add */
public void testAdd() {
OpenMapRealMatrix m = createSparseMatrix(testData);
OpenMapRealMatrix mInv = createSparseMatrix(testDataInv);
OpenMapRealMatrix mDataPlusInv = createSparseMatrix(testDataPlusInv);
RealMatrix mPlusMInv = m.add(mInv);
for (int row = 0; row < m.getRowDimension(); row++) {
for (int col = 0; col < m.getColumnDimension(); col++) {
assertEquals(
"sum entry entry",
mDataPlusInv.getEntry(row, col),
mPlusMInv.getEntry(row, col),
entryTolerance);
}
}
}