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Added tests corresponding to examples in user guide. 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/math/trunk@141227 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Phil Steitz 2004-05-18 04:08:38 +00:00
parent 7abfc91d9b
commit c434c70902
1 changed files with 30 additions and 1 deletions
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31
src/test/org/apache/commons/math/linear/RealMatrixImplTest.java
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@ -22,7 +22,7 @@ import junit.framework.TestSuite;
/**
* Test cases for the {@link RealMatrixImpl} class.
*
* @version $Revision: 1.13 $ $Date: 2004/04/08 07:08:22 $
* @version $Revision: 1.14 $ $Date: 2004/05/18 04:08:38 $
*/
public final class RealMatrixImplTest extends TestCase {
@ -435,6 +435,35 @@ public final class RealMatrixImplTest extends TestCase {
}
}
/** test examples in user guide */
public void testExamples() {
// Create a real matrix with two rows and three columns
double[][] matrixData = { {1d,2d,3d}, {2d,5d,3d}};
RealMatrix m = new RealMatrixImpl(matrixData);
// One more with three rows, two columns
double[][] matrixData2 = { {1d,2d}, {2d,5d}, {1d, 7d}};
RealMatrix n = new RealMatrixImpl();
n.setData(matrixData2);
// Now multiply m by n
RealMatrix p = m.multiply(n);
assertEquals(2, p.getRowDimension());
assertEquals(2, p.getColumnDimension());
// Invert p
RealMatrix pInverse = p.inverse();
assertEquals(2, pInverse.getRowDimension());
assertEquals(2, pInverse.getColumnDimension());
// Solve example
double[][] coefficientsData = {{2, 3, -2}, {-1, 7, 6}, {4, -3, -5}};
RealMatrix coefficients = new RealMatrixImpl(coefficientsData);
double[] constants = {1, -2, 1};
double[] solution = coefficients.solve(constants);
assertEquals(2 * solution[0] + 3 * solution[1] -2 * solution[2], constants[0], 1E-12);
assertEquals(-1 * solution[0] + 7 * solution[1] + 6 * solution[2], constants[1], 1E-12);
assertEquals(4 * solution[0] - 3 * solution[1] -5 * solution[2], constants[2], 1E-12);
}
//--------------- -----------------Protected methods
/** verifies that two matrices are close (1-norm) */