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MATH-468 

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git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1055929 13f79535-47bb-0310-9956-ffa450edef68
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Gilles Sadowski 2011-01-06 16:17:25 +00:00
parent dd199c3ef8
commit 81d30ccd16
1 changed files with 30 additions and 0 deletions
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30
src/main/java/org/apache/commons/math/util/MathUtils.java
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@ -35,6 +35,7 @@ import org.apache.commons.math.exception.MathArithmeticException;
import org.apache.commons.math.exception.MathIllegalArgumentException;
import org.apache.commons.math.exception.MathRuntimeException;
import org.apache.commons.math.exception.NumberIsTooLargeException;
import org.apache.commons.math.exception.NotFiniteNumberException;
/**
* Some useful additions to the built-in functions in {@link Math}.
@ -1840,6 +1841,35 @@ public final class MathUtils {
checkOrder(val, OrderDirection.INCREASING, true);
}
/**
* Check that the argument is a real number.
*
* @param x Argument.
* @throws NotFiniteNumberException if {@code x} is not a
* finite real number.
*/
public static void checkFinite(final double x) {
if (Double.isInfinite(x) || Double.isNaN(x)) {
throw new NotFiniteNumberException(x);
}
}
/**
* Check that all the elements are real number.
*
* @param val Arguments.
* @throws NotFiniteNumberException if any values of the array is not a
* finite real number.
*/
public static void checkFinite(final double[] val) {
for (int i = 0; i < val.length; i++) {
final double x = val[i];
if (Double.isInfinite(x) || Double.isNaN(x)) {
throw new NotFiniteNumberException(LocalizedFormats.ARRAY_ELEMENT, x, i);
}
}
}
/**
* Returns the Cartesian norm (2-norm), handling both overflow and underflow.
* Translation of the minpack enorm subroutine.