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MATH-361 

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@962702 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Gilles Sadowski 2010-07-09 21:40:19 +00:00
parent e038fdb1cc
commit 968c4a2cf4
2 changed files with 25 additions and 19 deletions
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33
src/main/java/org/apache/commons/math/analysis/polynomials/PolynomialFunction.java
View File

@ -19,7 +19,7 @@ package org.apache.commons.math.analysis.polynomials;
import java.io.Serializable;
import java.util.Arrays;
import org.apache.commons.math.exception.NotStrictlyPositiveException;
import org.apache.commons.math.exception.NoDataException;
import org.apache.commons.math.analysis.DifferentiableUnivariateRealFunction;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.util.LocalizedFormats;
@ -58,20 +58,19 @@ public class PolynomialFunction implements DifferentiableUnivariateRealFunction,
*
* @param c polynomial coefficients
* @throws NullPointerException if c is null
* @throws NotStrictlyPositiveException if c is empty
* @throws NoDataException if c is empty
*/
public PolynomialFunction(double c[]) {
super();
if (c.length < 1) {
throw new NotStrictlyPositiveException(LocalizedFormats.EMPTY_POLYNOMIALS_COEFFICIENTS_ARRAY,
c.length);
int n = c.length;
if (n == 0) {
throw new NoDataException(LocalizedFormats.EMPTY_POLYNOMIALS_COEFFICIENTS_ARRAY);
}
int l = c.length;
while ((l > 1) && (c[l - 1] == 0)) {
--l;
while ((n > 1) && (c[n - 1] == 0)) {
--n;
}
this.coefficients = new double[l];
System.arraycopy(c, 0, this.coefficients, 0, l);
this.coefficients = new double[n];
System.arraycopy(c, 0, this.coefficients, 0, n);
}
/**
@ -118,14 +117,13 @@ public class PolynomialFunction implements DifferentiableUnivariateRealFunction,
* @param coefficients the coefficients of the polynomial to evaluate
* @param argument the input value
* @return the value of the polynomial
* @throws NotStrictlyPositiveException if coefficients is empty
* @throws NoDataException if coefficients is empty
* @throws NullPointerException if coefficients is null
*/
protected static double evaluate(double[] coefficients, double argument) {
int n = coefficients.length;
if (n < 1) {
throw new NotStrictlyPositiveException(LocalizedFormats.EMPTY_POLYNOMIALS_COEFFICIENTS_ARRAY,
n);
if (n == 0) {
throw new NoDataException(LocalizedFormats.EMPTY_POLYNOMIALS_COEFFICIENTS_ARRAY);
}
double result = coefficients[n - 1];
for (int j = n -2; j >=0; j--) {
@ -228,14 +226,13 @@ public class PolynomialFunction implements DifferentiableUnivariateRealFunction,
*
* @param coefficients the coefficients of the polynomial to differentiate
* @return the coefficients of the derivative or null if coefficients has length 1.
* @throws NotStrictlyPositiveException if coefficients is empty
* @throws NoDataException if coefficients is empty
* @throws NullPointerException if coefficients is null
*/
protected static double[] differentiate(double[] coefficients) {
int n = coefficients.length;
if (n < 1) {
throw new NotStrictlyPositiveException(LocalizedFormats.EMPTY_POLYNOMIALS_COEFFICIENTS_ARRAY,
n);
if (n == 0) {
throw new NoDataException(LocalizedFormats.EMPTY_POLYNOMIALS_COEFFICIENTS_ARRAY);
}
if (n == 1) {
return new double[]{0};

11
src/main/java/org/apache/commons/math/exception/NoDataException.java
View File

@ -16,6 +16,7 @@
*/
package org.apache.commons.math.exception;
import org.apache.commons.math.util.Localizable;
import org.apache.commons.math.util.LocalizedFormats;
/**
@ -29,6 +30,14 @@ public class NoDataException extends MathIllegalArgumentException {
* Construct the exception.
*/
public NoDataException() {
super(LocalizedFormats.NO_DATA, null);
this(null);
}
/**
* Construct the exception with a specific context.
*
* @param specific Contextual information on what caused the exception.
*/
public NoDataException(Localizable specific) {
super(specific, LocalizedFormats.NO_DATA, null);
}
}