Example usage for org.apache.commons.math3.geometry.euclidean.threed FieldVector3D scalarMultiply

Introduction

In this page you can find the example usage for org.apache.commons.math3.geometry.euclidean.threed FieldVector3D scalarMultiply.

Prototype

public FieldVector3D<T> scalarMultiply(final double a) 

Source Link

Document

Multiply the instance by a scalar.

Usage

From source file:org.orekit.utils.FieldPVCoordinatesTest.java

@Test
public void testGetMomentum() {
    //setup/* ww  w  .jav  a2s .  c  o m*/
    DerivativeStructure oneDS = new DerivativeStructure(1, 1, 1);
    DerivativeStructure zeroDS = new DerivativeStructure(1, 1, 0);
    FieldVector3D<DerivativeStructure> zero = new FieldVector3D<DerivativeStructure>(zeroDS, zeroDS, zeroDS);
    FieldVector3D<DerivativeStructure> i = new FieldVector3D<DerivativeStructure>(oneDS, zeroDS, zeroDS);
    FieldVector3D<DerivativeStructure> j = new FieldVector3D<DerivativeStructure>(zeroDS, oneDS, zeroDS);
    FieldVector3D<DerivativeStructure> k = new FieldVector3D<DerivativeStructure>(zeroDS, zeroDS, oneDS);
    FieldVector3D<DerivativeStructure> p = new FieldVector3D<DerivativeStructure>(oneDS,
            new DerivativeStructure(1, 1, -2), new DerivativeStructure(1, 1, 3));
    FieldVector3D<DerivativeStructure> v = new FieldVector3D<DerivativeStructure>(
            new DerivativeStructure(1, 1, -9), new DerivativeStructure(1, 1, 8),
            new DerivativeStructure(1, 1, -7));

    //action + verify
    Assert.assertEquals(new FieldPVCoordinates<DerivativeStructure>(p, v).getMomentum(), p.crossProduct(v));
    //check simple cases
    Assert.assertEquals(new FieldPVCoordinates<DerivativeStructure>(i, i.scalarMultiply(-1)).getMomentum(),
            zero);
    Assert.assertEquals(new FieldPVCoordinates<DerivativeStructure>(i, j).getMomentum(), k);
}

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From source file:org.orekit.utils.FieldPVCoordinatesTest.java

@Test
public void testGetAngularVelocity() {
    //setup/* w  w  w . j a  v a2s .  c  o  m*/
    DerivativeStructure oneDS = new DerivativeStructure(1, 1, 1);
    DerivativeStructure zeroDS = new DerivativeStructure(1, 1, 0);
    FieldVector3D<DerivativeStructure> zero = new FieldVector3D<DerivativeStructure>(zeroDS, zeroDS, zeroDS);
    FieldVector3D<DerivativeStructure> i = new FieldVector3D<DerivativeStructure>(oneDS, zeroDS, zeroDS);
    FieldVector3D<DerivativeStructure> j = new FieldVector3D<DerivativeStructure>(zeroDS, oneDS, zeroDS);
    FieldVector3D<DerivativeStructure> k = new FieldVector3D<DerivativeStructure>(zeroDS, zeroDS, oneDS);
    FieldVector3D<DerivativeStructure> p = new FieldVector3D<DerivativeStructure>(oneDS,
            new DerivativeStructure(1, 1, -2), new DerivativeStructure(1, 1, 3));
    FieldVector3D<DerivativeStructure> v = new FieldVector3D<DerivativeStructure>(
            new DerivativeStructure(1, 1, -9), new DerivativeStructure(1, 1, 8),
            new DerivativeStructure(1, 1, -7));

    //action + verify
    Assert.assertEquals(new FieldPVCoordinates<DerivativeStructure>(p, v).getAngularVelocity(),
            p.crossProduct(v).scalarMultiply(p.getNormSq().reciprocal()));
    //check extra simple cases
    Assert.assertEquals(
            new FieldPVCoordinates<DerivativeStructure>(i, i.scalarMultiply(-1)).getAngularVelocity(), zero);
    Assert.assertEquals(
            new FieldPVCoordinates<DerivativeStructure>(i.scalarMultiply(2), j).getAngularVelocity(),
            k.scalarMultiply(0.5));
}

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