org.hipparchus.analysis.function

## Class StepFunction

• All Implemented Interfaces:
UnivariateFunction

public class StepFunction
extends Object
implements UnivariateFunction
• ### Constructor Summary

Constructors
Constructor and Description
StepFunction(double[] x, double[] y)
Builds a step function from a list of arguments and the corresponding values.
• ### Method Summary

All Methods
Modifier and Type Method and Description
double value(double x)
Compute the value of the function.
• ### Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
• ### Constructor Detail

• #### StepFunction

public StepFunction(double[] x,
double[] y)
throws MathIllegalArgumentException,
NullArgumentException
Builds a step function from a list of arguments and the corresponding values. Specifically, returns the function h(x) defined by

h(x) = y[0] for all x < x[1]
y[1] for x[1] ≤ x < x[2]
...
y[y.length - 1] for x ≥ x[x.length - 1]

The value of x[0] is ignored, but it must be strictly less than x[1].
Parameters:
x - Domain values where the function changes value.
y - Values of the function.
Throws:
MathIllegalArgumentException - if the x array is not sorted in strictly increasing order.
NullArgumentException - if x or y are null.
MathIllegalArgumentException - if x or y are zero-length.
MathIllegalArgumentException - if x and y do not have the same length.
• ### Method Detail

• #### value

public double value(double x)
Compute the value of the function.
Specified by:
value in interface UnivariateFunction
Parameters:
x - Point at which the function value should be computed.
Returns:
the value of the function.