72 lines
2.0 KiB
JavaScript
72 lines
2.0 KiB
JavaScript
|
/**
|
||
|
|
* @license Apache-2.0
|
||
|
|
*
|
||
|
|
* Copyright (c) 2020 The Stdlib Authors.
|
||
|
|
*
|
||
|
|
* Licensed 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
'use strict';
|
||
|
|
|
||
|
|
// MAIN //
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Applies a unary function accepting and returning single-precision floating-point numbers to each element in a single-precision floating-point strided input array and assigns each result to an element in a single-precision floating-point strided output array.
|
||
|
|
*
|
||
|
|
* @param {NonNegativeInteger} N - number of indexed elements
|
||
|
|
* @param {Float32Array} x - input array
|
||
|
|
* @param {integer} strideX - `x` stride length
|
||
|
|
* @param {NonNegativeInteger} offsetX - starting `x` index
|
||
|
|
* @param {Float32Array} y - destination array
|
||
|
|
* @param {integer} strideY - `y` stride length
|
||
|
|
* @param {NonNegativeInteger} offsetY - starting `y` index
|
||
|
|
* @param {Function} fcn - unary function to apply
|
||
|
|
* @returns {Float32Array} `y`
|
||
|
|
*
|
||
|
|
* @example
|
||
|
|
* var Float32Array = require( '@stdlib/array/float32' );
|
||
|
|
*
|
||
|
|
* function scale( x ) {
|
||
|
|
* return x * 10.0;
|
||
|
|
* }
|
||
|
|
*
|
||
|
|
* var x = new Float32Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
|
||
|
|
* var y = new Float32Array( x.length );
|
||
|
|
*
|
||
|
|
* smap( x.length, x, 1, 0, y, 1, 0, scale );
|
||
|
|
*
|
||
|
|
* console.log( y );
|
||
|
|
* // => <Float32Array>[ 10.0, 20.0, 30.0, 40.0, 50.0 ]
|
||
|
|
*/
|
||
|
|
function smap( N, x, strideX, offsetX, y, strideY, offsetY, fcn ) {
|
||
|
|
var ix;
|
||
|
|
var iy;
|
||
|
|
var i;
|
||
|
|
if ( N <= 0 ) {
|
||
|
|
return y;
|
||
|
|
}
|
||
|
|
ix = offsetX;
|
||
|
|
iy = offsetY;
|
||
|
|
for ( i = 0; i < N; i++ ) {
|
||
|
|
y[ iy ] = fcn( x[ ix ] );
|
||
|
|
ix += strideX;
|
||
|
|
iy += strideY;
|
||
|
|
}
|
||
|
|
return y;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// EXPORTS //
|
||
|
|
|
||
|
|
module.exports = smap;
|