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removed a Math.min computation that could be avoided 

improved javadoc 

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@825784 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Luc Maisonobe 2009-10-16 07:12:56 +00:00
parent dd9b7b477a
commit 925305f0fa
1 changed files with 14 additions and 8 deletions
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22
src/main/java/org/apache/commons/math/analysis/polynomials/PolynomialFunctionLagrangeForm.java
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@ -274,8 +274,13 @@ public class PolynomialFunctionLagrangeForm implements UnivariateRealFunction {
/** /**
* Verifies that the interpolation arrays are valid. * Verifies that the interpolation arrays are valid.
* <p> * <p>
* The arrays features checked by this method are that both arrays have the
* same length and this length is at least 2.
* </p>
* <p>
* The interpolating points must be distinct. However it is not * The interpolating points must be distinct. However it is not
* verified here, it is checked in evaluate() and computeCoefficients().</p> * verified here, it is checked in evaluate() and computeCoefficients().
* </p>
* *
* @param x the interpolating points array * @param x the interpolating points array
* @param y the interpolating values array * @param y the interpolating values array
@ -283,17 +288,18 @@ public class PolynomialFunctionLagrangeForm implements UnivariateRealFunction {
* @see #evaluate(double[], double[], double) * @see #evaluate(double[], double[], double)
* @see #computeCoefficients() * @see #computeCoefficients()
*/ */
public static void verifyInterpolationArray(double x[], double y[]) throws public static void verifyInterpolationArray(double x[], double y[])
IllegalArgumentException { throws IllegalArgumentException {
if (Math.min(x.length, y.length) < 2) {
throw MathRuntimeException.createIllegalArgumentException(
"{0} points are required, got only {1}",
2, Math.min(x.length, y.length));
}
if (x.length != y.length) { if (x.length != y.length) {
throw MathRuntimeException.createIllegalArgumentException( throw MathRuntimeException.createIllegalArgumentException(
"dimension mismatch {0} != {1}", x.length, y.length); "dimension mismatch {0} != {1}", x.length, y.length);
} }
if (x.length < 2) {
throw MathRuntimeException.createIllegalArgumentException(
"{0} points are required, got only {1}", 2, x.length);
}
} }
} }