Apache
/
commons-math
mirror of https://github.com/apache/commons-math.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

New test for sin and cos derivatives. 

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1371681 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Luc Maisonobe 2012-08-10 12:18:12 +00:00
parent add45005fc
commit be1632f3e3
1 changed files with 35 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
src/test/java/org/apache/commons/math3/analysis/differentiation/DerivativeStructureTest.java
View File

@ -174,7 +174,7 @@ public class DerivativeStructureTest {
}
@Test
public void testPower() {
public void testPow() {
for (int maxOrder = 1; maxOrder < 5; ++maxOrder) {
for (int n = 0; n < 10; ++n) {
@ -425,6 +425,40 @@ public class DerivativeStructureTest {
}
}
@Test
public void testSinCos() {
double epsilon = 5.0e-16;
for (int maxOrder = 0; maxOrder < 6; ++maxOrder) {
for (double x = 0.1; x < 1.2; x += 0.001) {
DerivativeStructure dsX = new DerivativeStructure(1, maxOrder, 0, x);
DerivativeStructure sin = dsX.sin();
DerivativeStructure cos = dsX.cos();
double s = FastMath.sin(x);
double c = FastMath.cos(x);
for (int n = 0; n <= maxOrder; ++n) {
switch (n % 4) {
case 0 :
Assert.assertEquals( s, sin.getPartialDerivative(n), epsilon);
Assert.assertEquals( c, cos.getPartialDerivative(n), epsilon);
break;
case 1 :
Assert.assertEquals( c, sin.getPartialDerivative(n), epsilon);
Assert.assertEquals(-s, cos.getPartialDerivative(n), epsilon);
break;
case 2 :
Assert.assertEquals(-s, sin.getPartialDerivative(n), epsilon);
Assert.assertEquals(-c, cos.getPartialDerivative(n), epsilon);
break;
default :
Assert.assertEquals(-c, sin.getPartialDerivative(n), epsilon);
Assert.assertEquals( s, cos.getPartialDerivative(n), epsilon);
break;
}
}
}
}
}
@Test
public void testTangentDefinition() {
double[] epsilon = new double[] { 5.0e-16, 2.0e-15, 3.0e-14, 5.0e-13, 2.0e-11 };