From b69aec0dffd0208f479b8d501a2ee61ffbd3a5ee Mon Sep 17 00:00:00 2001
From: aherbert <aherbert@apache.org>
Date: Thu, 13 Oct 2022 13:59:27 +0100
Subject: [PATCH] Remove use of deprecated class

---
 .../math4/legacy/analysis/differentiation/DSCompiler.java  | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/analysis/differentiation/DSCompiler.java b/commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/analysis/differentiation/DSCompiler.java
index 0094503ec..de9ab7690 100644
--- a/commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/analysis/differentiation/DSCompiler.java
+++ b/commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/analysis/differentiation/DSCompiler.java
@@ -27,7 +27,7 @@ import org.apache.commons.math4.legacy.exception.MathArithmeticException;
 import org.apache.commons.math4.legacy.exception.MathInternalError;
 import org.apache.commons.math4.legacy.exception.NotPositiveException;
 import org.apache.commons.math4.legacy.exception.NumberIsTooLargeException;
-import org.apache.commons.numbers.combinatorics.FactorialDouble;
+import org.apache.commons.numbers.combinatorics.Factorial;
 import org.apache.commons.math4.core.jdkmath.JdkMath;
 
 /** Class holding "compiled" computation rules for derivative structures.
@@ -123,9 +123,6 @@ import org.apache.commons.math4.core.jdkmath.JdkMath;
  * @since 3.1
  */
 public final class DSCompiler {
-    /** Cache for factorials. */
-    private static final FactorialDouble FACTORIAL = FactorialDouble.create().withCache(30);
-
     /** Array of all compilers created so far. */
     private static AtomicReference<DSCompiler[][]> compilers =
             new AtomicReference<>(null);
@@ -1759,7 +1756,7 @@ public final class DSCompiler {
             for (int k = 0; k < orders.length; ++k) {
                 if (orders[k] > 0) {
                     try {
-                        term *= JdkMath.pow(delta[k], orders[k]) / FACTORIAL.value(orders[k]);
+                        term *= JdkMath.pow(delta[k], orders[k]) / Factorial.doubleValue(orders[k]);
                     } catch (NotPositiveException e) {
                         // this cannot happen
                         throw new MathInternalError(e);