Check-in commons-math 3.6.1 am: 1354beaf45 am: 0018f64b87 am: b3715644fb am: 5484895ffd

Original change: https://android-review.googlesource.com/c/platform/external/apache-commons-math/+/2702413

Change-Id: Idb04c8014ec76e9930d6d0aa22dac3b0b54333c8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/src/main/java/org/apache/commons/math3/linear/SparseRealVector.java b/src/main/java/org/apache/commons/math3/linear/SparseRealVector.java
new file mode 100644
index 0000000..4eb2ce5
--- /dev/null
+++ b/src/main/java/org/apache/commons/math3/linear/SparseRealVector.java
@@ -0,0 +1,29 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.math3.linear;
+
+/**
+ * Marker class for RealVectors that require sparse backing storage
+ *
+ * <p>Caveat: Implementation are allowed to assume that, for any {@code x}, the equality {@code x *
+ * 0d == 0d} holds. But it is is not true for {@code NaN}. Moreover, zero entries will lose their
+ * sign. Some operations (that involve {@code NaN} and/or infinities) may thus give incorrect
+ * results, like multiplications, divisions or functions mapping.
+ *
+ * @since 2.0
+ */
+public abstract class SparseRealVector extends RealVector {}