disable atan2 checks (slow and more confusing)

Author: bourgesl

src/main/java/fr/jmmc/jmcs/util/NumberUtils.java

@@ -49,11 +49,6 @@ public final class NumberUtils {
 
     /** Smallest positive number used in double comparisons (rounding). */
     public final static double EPSILON = 1e-6;
-    /* PI and PI/2 constants */
-    public final static double PI = Math.PI;
-    public final static double PI_HALF = PI / 2.0;
-    /** Typical scale precision in re/im comparisons (rounding). */
-    public static final double ARG_EPSILON = Math.ulp(1.0);
     /* shared Double instances */
     /** shared Double = NaN instance */
     public final static Double DBL_NAN = Double.valueOf(Double.NaN);
@@ -71,25 +66,6 @@ public static double getArgumentInDegrees(final double re, final double im) {
     }
 
     public static double getArgument(final double re, final double im) {
-        // check |re| == 0
-        final double normRe = Math.abs(re);
-        if (normRe == 0.0) {
-            return (im >= 0.0) ? PI_HALF : -PI_HALF;
-        }
-        // check |im| == 0
-        final double normIm = Math.abs(im);
-        if (normIm == 0.0) {
-            return (re >= 0.0) ? 0.0 : PI;
-        }
-        final double epsilon = ARG_EPSILON * (normRe + normIm);
-        // check |re| << |im| or |im| << |re|
-        if (normIm <= epsilon) {
-            return (re >= 0.0) ? 0.0 : PI;
-        }
-        // check |im| << |re|
-        if (normRe <= epsilon) {
-            return (im >= 0.0) ? PI_HALF : -PI_HALF;
-        }
         return Math.atan2(im, re);
     }