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commons/proper/math/trunk/src/test/resources/org/apache/commons/math3/distribution/gamma-distribution-shape-142.csv
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Added:
commons/proper/math/trunk/src/test/resources/org/apache/commons/math3/distribution/gamma-distribution.mac
URL:
http://svn.apache.org/viewvc/commons/proper/math/trunk/src/test/resources/org/apache/commons/math3/distribution/gamma-distribution.mac?rev=1338986&view=auto
==============================================================================
---
commons/proper/math/trunk/src/test/resources/org/apache/commons/math3/distribution/gamma-distribution.mac
(added)
+++
commons/proper/math/trunk/src/test/resources/org/apache/commons/math3/distribution/gamma-distribution.mac
Wed May 16 03:31:10 2012
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+/*
+ * 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.
+ */
+
+/*
+ * This Maxima script allows the creation of reference data for the Gamma
+ * distribution.
+ */
+
+/*
+ * Set floating-point accuracy to four times the double precision.
+ */
+fpprec : 64;
+
+/*
+ * Probability density function for Gamma distribution with shape parameter a
+ * and scale parameter b.
+ */
+p(x, a, b) := (x / b)**a * exp(-x / b) / x / gamma(a);
+
+/*
+ * Make sure x is a list of exactly representable doubles: use only
power-of-two
+ * fractions of unity.
+ */
+out : openw("gamma-distribution-shape-1.csv");
+x : float(makelist(i / 32, i, 1, 3200));
+y : p(bfloat(x), 1, 1);
+printf(out, "~{~h, ~h~%~}", join(x, y));
+close(out);
+
+out : openw("gamma-distribution-shape-10.csv");
+x : float(makelist(i / 4, i, 1, 400));
+y : p(bfloat(x), 10, 1);
+printf(out, "~{~h, ~h~%~}", join(x, y));
+close(out);
+
+out : openw("gamma-distribution-shape-100.csv");
+x : float(append(makelist(i / 32, i, 1, 32 * 3), makelist(i + 3, i, 1, 297)));
+y : p(bfloat(x), 100, 1);
+printf(out, "~{~h, ~h~%~}", join(x, y));
+close(out);
+
+out : openw("gamma-distribution-shape-142.csv");
+x : float(append(makelist(i / 32, i, 1, 32 * 10), makelist(i + 10, i, 1,
440)));
+y : p(bfloat(x), 142, 1);
+printf(out, "~{~h, ~h~%~}", join(x, y));
+close(out);
+
+out : openw("gamma-distribution-shape-1000.csv");
+x : float(append(makelist(i / 32, i, 1, 32 * 10), makelist(i + 10, i, 1,
2990)));
+y : p(bfloat(x), 1000, 1);
+printf(out, "~{~h, ~h~%~}", join(x, y));
+close(out);
+
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