ndarray.native.js (2389B)
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 'use strict'; 20 21 // MODULES // 22 23 var Float32Array = require( '@stdlib/array/float32' ); 24 var Uint8Array = require( '@stdlib/array/uint8' ); 25 var addon = require( './snanmskmin.native.js' ); 26 27 28 // MAIN // 29 30 /** 31 * Computes the minimum value of a single-precision floating-point strided array according to a mask, ignoring `NaN` values. 32 * 33 * @param {PositiveInteger} N - number of indexed elements 34 * @param {Float32Array} x - input array 35 * @param {integer} strideX - `x` stride length 36 * @param {NonNegativeInteger} offsetX - `x` starting index 37 * @param {Uint8Array} mask - mask array 38 * @param {integer} strideMask - `mask` stride length 39 * @param {NonNegativeInteger} offsetMask - `mask` starting index 40 * @returns {number} minimum value 41 * 42 * @example 43 * var Float32Array = require( '@stdlib/array/float32' ); 44 * var Uint8Array = require( '@stdlib/array/uint8' ); 45 * var floor = require( '@stdlib/math/base/special/floor' ); 46 * 47 * var x = new Float32Array( [ 2.0, 1.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0, -5.0, -6.0 ] ); 48 * var mask = new Uint8Array( [ 0, 0, 0, 0, 0, 0, 0, 0, 1, 1 ] ); 49 * var N = floor( x.length / 2 ); 50 * 51 * var v = snanmskmin( N, x, 2, 1, mask, 2, 1 ); 52 * // returns -2.0 53 */ 54 function snanmskmin( N, x, strideX, offsetX, mask, strideMask, offsetMask ) { 55 var viewX; 56 var viewM; 57 if ( strideX < 0 ) { 58 offsetX += (N-1) * strideX; 59 } 60 if ( strideMask < 0 ) { 61 offsetMask += (N-1) * strideMask; 62 } 63 viewX = new Float32Array( x.buffer, x.byteOffset+(x.BYTES_PER_ELEMENT*offsetX), x.length-offsetX ); // eslint-disable-line max-len 64 viewM = new Uint8Array( mask.buffer, mask.byteOffset+(mask.BYTES_PER_ELEMENT*offsetMask), mask.length-offsetMask ); // eslint-disable-line max-len 65 return addon( N, viewX, strideX, viewM, strideMask ); 66 } 67 68 69 // EXPORTS // 70 71 module.exports = snanmskmin;