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java.lang.Objectorg.apache.commons.math.analysis.interpolation.MicrosphereInterpolatingFunction
public class MicrosphereInterpolatingFunction
Interpolating function that implements the Microsphere Projection.
Nested Class Summary | |
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private static class |
MicrosphereInterpolatingFunction.MicrosphereSurfaceElement
Class for storing the accounting data needed to perform the microsphere projection. |
Field Summary | |
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private double |
brightnessExponent
Exponent used in the power law that computes the weights of the sample data. |
private int |
dimension
Space dimension. |
private java.util.List<MicrosphereInterpolatingFunction.MicrosphereSurfaceElement> |
microsphere
Internal accounting data for the interpolation algorithm. |
private java.util.Map<RealVector,java.lang.Double> |
samples
Sample data. |
Constructor Summary | |
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MicrosphereInterpolatingFunction(double[][] xval,
double[] yval,
int brightnessExponent,
int microsphereElements,
UnitSphereRandomVectorGenerator rand)
|
Method Summary | |
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private double |
cosAngle(RealVector v,
RealVector w)
Compute the cosine of the angle between 2 vectors. |
double |
value(double[] point)
Compute the value for the function at the given point. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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private final int dimension
private final java.util.List<MicrosphereInterpolatingFunction.MicrosphereSurfaceElement> microsphere
private final double brightnessExponent
private final java.util.Map<RealVector,java.lang.Double> samples
Constructor Detail |
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public MicrosphereInterpolatingFunction(double[][] xval, double[] yval, int brightnessExponent, int microsphereElements, UnitSphereRandomVectorGenerator rand) throws DimensionMismatchException, java.lang.IllegalArgumentException
xval
- the arguments for the interpolation points.
xval[i][0]
is the first component of interpolation point
i
, xval[i][1]
is the second component, and so on
until xval[i][d-1]
, the last component of that interpolation
point (where dimension
is thus the dimension of the sampled
space).yval
- the values for the interpolation pointsbrightnessExponent
- Brightness dimming factor.microsphereElements
- Number of surface elements of the
microsphere.rand
- Unit vector generator for creating the microsphere.
DimensionMismatchException
- if the lengths of yval
and
xval
(equal to n
, the number of interpolation points)
do not match, or the the arrays xval[0]
... xval[n]
,
have lengths different from dimension
.
java.lang.IllegalArgumentException
- if there are no data (xval null or zero length)Method Detail |
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public double value(double[] point)
MultivariateRealFunction
value
in interface MultivariateRealFunction
point
- Interpolation point.
private double cosAngle(RealVector v, RealVector w)
v
- Vector.w
- Vector.
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