a9bfe50fe1
Brennan Ashton has submitted the ICLA as a result we can migrate the licenses to Apache. Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/****************************************************************************
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* libs/libc/math/lib_asinh.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/compiler.h>
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#include <math.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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#ifdef CONFIG_HAVE_DOUBLE
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double asinh(double x)
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{
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double y;
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double z = x * x;
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if (z < 1E-9)
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{
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/* x - 1/6 * x^3 + 3/40 * x^5 - 5/112 * x^7 + ... */
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y = x * (1 - z / 6.0);
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}
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else
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{
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y = log(x + sqrt(z + 1));
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}
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return y;
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}
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#endif
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