ramp.c (1090B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2020 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 #include "stdlib/math/base/special/ramp.h" 20 #include "stdlib/math/base/assert/is_nan.h" 21 22 /** 23 * Evaluates the ramp function. 24 * 25 * @param x number 26 * @return function value 27 * 28 * @example 29 * double v = ramp( 3.14 ); 30 * // returns 3.14 31 * 32 * @example 33 * double v = ramp( -3.14 ); 34 * // returns 0.0 35 */ 36 double stdlib_base_ramp( const double x ) { 37 if ( stdlib_base_is_nan( x ) ) { 38 return 0.0 / 0.0; // NaN 39 } 40 if ( x > 0.0 ) { 41 return x; 42 } 43 return 0.0; // handles `-0` 44 }