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| Original file line number | Diff line number | Diff line change |
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| <!-- | ||
| @license Apache-2.0 | ||
| Copyright (c) 2024 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. | ||
| --> | ||
|
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| # mskput | ||
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| > Replace elements of an array with provided values according to a provided mask array. | ||
| <section class="usage"> | ||
|
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| ## Usage | ||
|
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| ```javascript | ||
| var mskput = require( '@stdlib/array/mskput' ); | ||
| ``` | ||
|
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| #### mskput( x, mask, values\[, options] ) | ||
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| Replaces elements of an array with provided values according to a provided mask array. | ||
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| ```javascript | ||
| var x = [ 1, 2, 3, 4 ]; | ||
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| var out = mskput( x, [ 1, 0, 1, 0 ], [ 20, 40 ] ); | ||
| // returns [ 1, 20, 3, 40 ] | ||
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| var bool = ( out === x ); | ||
| // returns true | ||
| ``` | ||
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| The function supports the following parameters: | ||
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| - **x**: input array. | ||
| - **mask**: mask array. | ||
| - **values**: values to set. | ||
| - **options**: function options. | ||
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| The function supports the following options: | ||
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| - **mode**: string specifying behavior when the number of `values` does not equal the number of falsy `mask` values. Default: `'repeat'`. | ||
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| The function supports the following modes: | ||
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| - `'strict'`: specifies that the function must raise an exception when the number of `values` does not **exactly** equal the number of falsy `mask` values. | ||
| - `'non_strict'`: specifies that the function must raise an exception when the function is provided insufficient `values` to satisfy the `mask` array. | ||
| - `'strict_broadcast'`: specifies that the function must broadcast a single-element `values` array and otherwise raise an exception when the number of `values` does not **exactly** equal the number of falsy `mask` values. | ||
| - `'broadcast'`: specifies that the function must broadcast a single-element `values` array and otherwise raise an exception when the function is provided insufficient `values` to satisfy the `mask` array. | ||
| - `'repeat'`: specifies that the function must reuse provided `values` when replacing elements in `x` in order to satisfy the `mask` array. | ||
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| In broadcasting modes, the function supports broadcasting a `values` array containing a single element against the number of falsy values in the `mask` array. | ||
|
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| ```javascript | ||
| var x = [ 1, 2, 3, 4 ]; | ||
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| var out = mskput( x, [ 1, 0, 1, 0 ], [ 20 ], { | ||
| 'mode': 'strict_broadcast' | ||
| }); | ||
| // returns [ 1, 20, 3, 20 ] | ||
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| var bool = ( out === x ); | ||
| // returns true | ||
| ``` | ||
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| In repeat mode, the function supports recycling elements in a `values` array to satisfy the number of falsy values in the `mask` array. | ||
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| ```javascript | ||
| var x = [ 1, 2, 3, 4 ]; | ||
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| var out = mskput( x, [ 0, 0, 1, 0 ], [ 20, 40 ], { | ||
| 'mode': 'repeat' | ||
| }); | ||
| // returns [ 20, 40, 3, 20 ] | ||
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| var bool = ( out === x ); | ||
| // returns true | ||
| ``` | ||
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| </section> | ||
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| <!-- /.usage --> | ||
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| <section class="notes"> | ||
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| ## Notes | ||
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| - The function mutates the input array `x`. | ||
| - If a `mask` array element is falsy, the corresponding element in `x` is **replaced**; otherwise, the corresponding element in `x` is "masked" and thus left unchanged. | ||
| - The `values` array must have a [data type][@stdlib/array/dtypes] which can be [safely cast][@stdlib/array/safe-casts] to the input array data type. Floating-point data types (both real and complex) are allowed to downcast to a lower precision data type of the [same kind][@stdlib/array/same-kind-casts] (e.g., element values from a `'float64'` values array can be assigned to corresponding elements in a `'float32'` input array). | ||
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| </section> | ||
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| <!-- /.notes --> | ||
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| <section class="examples"> | ||
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| ## Examples | ||
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| <!-- eslint no-undef: "error" --> | ||
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| ```javascript | ||
| var filledBy = require( '@stdlib/array/base/filled-by' ); | ||
| var discreteUniform = require( '@stdlib/random/base/discrete-uniform' ); | ||
| var bernoulli = require( '@stdlib/random/base/bernoulli' ); | ||
| var linspace = require( '@stdlib/array/base/linspace' ); | ||
| var mskput = require( '@stdlib/array/mskput' ); | ||
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| // Generate a linearly spaced array: | ||
| var x = linspace( 0, 100, 11 ); | ||
| console.log( x ); | ||
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| // Generate a random mask array: | ||
| var N = discreteUniform( 5, 15 ); | ||
| var mask = filledBy( N, bernoulli.factory( 0.3 ) ); | ||
| console.log( mask ); | ||
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| // Generate an array of random values: | ||
| var values = filledBy( N, discreteUniform.factory( 1000, 2000 ) ); | ||
| console.log( values ); | ||
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| // Update a random sample of elements in `x`: | ||
| var out = mskput( x, mask, values ); | ||
| console.log( out ); | ||
| ``` | ||
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| </section> | ||
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| <!-- /.examples --> | ||
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| <!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. --> | ||
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| <section class="related"> | ||
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| </section> | ||
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| <!-- /.related --> | ||
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| <!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. --> | ||
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| <section class="links"> | ||
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| [@stdlib/array/dtypes]: https://github.com/stdlib-js/array/tree/main/dtypes | ||
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| [@stdlib/array/safe-casts]: https://github.com/stdlib-js/array/tree/main/safe-casts | ||
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| [@stdlib/array/same-kind-casts]: https://github.com/stdlib-js/array/tree/main/same-kind-casts | ||
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| </section> | ||
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| <!-- /.links --> |
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| /** | ||
| * @license Apache-2.0 | ||
| * | ||
| * Copyright (c) 2024 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. | ||
| */ | ||
|
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| 'use strict'; | ||
|
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| // MODULES // | ||
|
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| var bench = require( '@stdlib/bench' ); | ||
| var isArray = require( '@stdlib/assert/is-array' ); | ||
| var zeroTo = require( './../../base/zero-to' ); | ||
| var zeros = require( './../../base/zeros' ); | ||
| var pkg = require( './../package.json' ).name; | ||
| var mskput = require( './../lib' ); | ||
|
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|
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| // MAIN // | ||
|
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| bench( pkg+'::no_broadcasting:len=100', function benchmark( b ) { | ||
| var mask; | ||
| var x; | ||
| var i; | ||
| var v; | ||
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| x = zeroTo( 100 ); | ||
| mask = zeros( 100 ); | ||
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| b.tic(); | ||
| for ( i = 0; i < b.iterations; i++ ) { | ||
| v = mskput( x, mask, x ); | ||
| if ( typeof v !== 'object' ) { | ||
| b.fail( 'should return an array' ); | ||
| } | ||
| } | ||
| b.toc(); | ||
| if ( !isArray( v ) ) { | ||
| b.fail( 'should return an array' ); | ||
| } | ||
| b.pass( 'benchmark finished' ); | ||
| b.end(); | ||
| }); | ||
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| bench( pkg+'::broadcasting:len=100', function benchmark( b ) { | ||
| var mask; | ||
| var x; | ||
| var i; | ||
| var v; | ||
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| x = zeroTo( 100 ); | ||
| mask = zeros( 100 ); | ||
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| b.tic(); | ||
| for ( i = 0; i < b.iterations; i++ ) { | ||
| v = mskput( x, mask, [ i ] ); | ||
| if ( typeof v !== 'object' ) { | ||
| b.fail( 'should return an array' ); | ||
| } | ||
| } | ||
| b.toc(); | ||
| if ( !isArray( v ) ) { | ||
| b.fail( 'should return an array' ); | ||
| } | ||
| b.pass( 'benchmark finished' ); | ||
| b.end(); | ||
| }); |
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