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‎CHANGELOG.md‎

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### Features
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- [`84f5112`](https://github.com/stdlib-js/stdlib/commit/84f5112f3421879e142a220cd8d6853c2f00fd3d) - add `blas/ext/base/zunitspace` [(#11709)](https://github.com/stdlib-js/stdlib/pull/11709)
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- [`7c287ff`](https://github.com/stdlib-js/stdlib/commit/7c287ff7a9a2e2b4b3f07afd719a440f8e6bccf2) - add `blas/ext/base/sdiff` [(#10901)](https://github.com/stdlib-js/stdlib/pull/10901)
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- [`e764597`](https://github.com/stdlib-js/stdlib/commit/e76459793b63f8dcd9850db3f9b83b338b5fbcee) - update `blas/base` TypeScript declarations [(#11711)](https://github.com/stdlib-js/stdlib/pull/11711)
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- [`bad4f4c`](https://github.com/stdlib-js/stdlib/commit/bad4f4cfbb59a6d12e985580defb647ff4861b6c) - add `blas/ext/base/cunitspace` [(#11708)](https://github.com/stdlib-js/stdlib/pull/11708)
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<details>
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- [`84f5112`](https://github.com/stdlib-js/stdlib/commit/84f5112f3421879e142a220cd8d6853c2f00fd3d) - **feat:** add `blas/ext/base/zunitspace` [(#11709)](https://github.com/stdlib-js/stdlib/pull/11709) _(by Muhammad Haris)_
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- [`7c287ff`](https://github.com/stdlib-js/stdlib/commit/7c287ff7a9a2e2b4b3f07afd719a440f8e6bccf2) - **feat:** add `blas/ext/base/sdiff` [(#10901)](https://github.com/stdlib-js/stdlib/pull/10901) _(by Muhammad Haris)_
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- [`9e425b0`](https://github.com/stdlib-js/stdlib/commit/9e425b0d518324df48c43e78327c6b01b6483d75) - **docs:** update namespace table of contents [(#11712)](https://github.com/stdlib-js/stdlib/pull/11712) _(by stdlib-bot)_
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- [`e764597`](https://github.com/stdlib-js/stdlib/commit/e76459793b63f8dcd9850db3f9b83b338b5fbcee) - **feat:** update `blas/base` TypeScript declarations [(#11711)](https://github.com/stdlib-js/stdlib/pull/11711) _(by stdlib-bot)_

‎ext/base/zunitspace/README.md‎

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<!--
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@license Apache-2.0
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Copyright (c) 2026 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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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,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# zunitspace
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> Fill a double-precision complex floating-point strided array with linearly spaced numeric elements which increment by `1` starting from a specified value.
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<section class="usage">
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## Usage
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```javascript
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var zunitspace = require( '@stdlib/blas/ext/base/zunitspace' );
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```
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#### zunitspace( N, start, x, strideX )
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Fills a double-precision complex floating-point strided array with linearly spaced numeric elements which increment by `1` starting from a specified value.
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```javascript
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var Complex128 = require( '@stdlib/complex/float64/ctor' );
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var Complex128Array = require( '@stdlib/array/complex128' );
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var x = new Complex128Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );
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zunitspace( x.length, new Complex128( 3.0, 0.0 ), x, 1 );
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// x => <Complex128Array>[ 3.0, 0.0, 4.0, 0.0, 5.0, 0.0, 6.0, 0.0 ]
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```
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The function has the following parameters:
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- **N**: number of indexed elements.
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- **start**: starting [`Complex128`][@stdlib/complex/float64/ctor] value.
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- **x**: input [`Complex128Array`][@stdlib/array/complex128].
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- **strideX**: stride length.
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The `N` and stride parameters determine which elements in the strided array are accessed at runtime. For example, to fill every other element:
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<!-- eslint-disable max-len -->
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```javascript
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var Complex128 = require( '@stdlib/complex/float64/ctor' );
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var Complex128Array = require( '@stdlib/array/complex128' );
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var x = new Complex128Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ] );
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zunitspace( 3, new Complex128( 3.0, 0.0 ), x, 2 );
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// x => <Complex128Array>[ 3.0, 0.0, 3.0, 4.0, 4.0, 0.0, 7.0, 8.0, 5.0, 0.0, 11.0, 12.0 ]
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```
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Note that indexing is relative to the first index. To introduce an offset, use [`typed array`][mdn-typed-array] views.
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<!-- eslint-disable max-len -->
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```javascript
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var Complex128 = require( '@stdlib/complex/float64/ctor' );
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var Complex128Array = require( '@stdlib/array/complex128' );
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// Initial array...
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var x0 = new Complex128Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ] );
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// Create an offset view...
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var x1 = new Complex128Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
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// Fill every other element...
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zunitspace( 3, new Complex128( 3.0, 0.0 ), x1, 2 );
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// x0 => <Complex128Array>[ 1.0, 2.0, 3.0, 0.0, 5.0, 6.0, 4.0, 0.0, 9.0, 10.0, 5.0, 0.0 ]
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```
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#### zunitspace.ndarray( N, start, x, strideX, offsetX )
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Fills a double-precision complex floating-point strided array with linearly spaced numeric elements which increment by `1` starting from a specified value using alternative indexing semantics.
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```javascript
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var Complex128 = require( '@stdlib/complex/float64/ctor' );
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var Complex128Array = require( '@stdlib/array/complex128' );
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var x = new Complex128Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );
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zunitspace.ndarray( x.length, new Complex128( 3.0, 0.0 ), x, 1, 0 );
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// x => <Complex128Array>[ 3.0, 0.0, 4.0, 0.0, 5.0, 0.0, 6.0, 0.0 ]
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```
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The function has the following additional parameters:
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- **offsetX**: starting index.
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While [`typed array`][mdn-typed-array] views mandate a view offset based on the underlying buffer, the offset parameter supports indexing semantics based on a starting index. For example, to access only the last three elements:
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<!-- eslint-disable max-len -->
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```javascript
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var Complex128 = require( '@stdlib/complex/float64/ctor' );
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var Complex128Array = require( '@stdlib/array/complex128' );
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var x = new Complex128Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ] );
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zunitspace.ndarray( 3, new Complex128( 3.0, 0.0 ), x, 1, x.length-3 );
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// x => <Complex128Array>[ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 3.0, 0.0, 4.0, 0.0, 5.0, 0.0 ]
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```
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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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- If `N <= 0`, both functions return `x` unchanged.
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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
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var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
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var Complex128Array = require( '@stdlib/array/complex128' );
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var Complex128 = require( '@stdlib/complex/float64/ctor' );
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var zunitspace = require( '@stdlib/blas/ext/base/zunitspace' );
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var xbuf = discreteUniform( 20, -100, 100, {
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'dtype': 'float64'
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});
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var x = new Complex128Array( xbuf.buffer );
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console.log( x );
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zunitspace( x.length, new Complex128( 3.0, 0.0 ), x, 1 );
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console.log( x );
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```
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</section>
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<!-- /.examples -->
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<!-- C interface documentation. -->
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* * *
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<section class="c">
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## C APIs
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<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
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<section class="intro">
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</section>
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<!-- /.intro -->
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<!-- C usage documentation. -->
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<section class="usage">
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### Usage
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```c
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#include "stdlib/blas/ext/base/zunitspace.h"
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```
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#### stdlib_strided_zunitspace( N, start, \*X, strideX )
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Fills a double-precision complex floating-point strided array with linearly spaced numeric elements which increment by `1` starting from a specified value.
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```c
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#include "stdlib/complex/float64/ctor.h"
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double x[] = { 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 };
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const stdlib_complex128_t start = stdlib_complex128( 3.0, 0.0 );
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stdlib_strided_zunitspace( 4, start, (stdlib_complex128_t *)x, 1 );
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```
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The function accepts the following arguments:
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- **N**: `[in] CBLAS_INT` number of indexed elements.
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- **start**: `[in] stdlib_complex128_t` starting value.
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- **X**: `[out] stdlib_complex128_t*` input array.
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- **strideX**: `[in] CBLAS_INT` stride length.
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```c
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void API_SUFFIX(stdlib_strided_zunitspace)( const CBLAS_INT N, const stdlib_complex128_t start, stdlib_complex128_t *X, const CBLAS_INT strideX );
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```
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#### stdlib_strided_zunitspace_ndarray( N, start, \*X, strideX, offsetX )
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Fills a double-precision complex floating-point strided array with linearly spaced numeric elements which increment by `1` starting from a specified value using alternative indexing semantics.
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```c
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#include "stdlib/complex/float64/ctor.h"
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double x[] = { 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 };
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const stdlib_complex128_t start = stdlib_complex128( 3.0, 0.0 );
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stdlib_strided_zunitspace_ndarray( 4, start, (stdlib_complex128_t *)x, 1, 0 );
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```
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The function accepts the following arguments:
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- **N**: `[in] CBLAS_INT` number of indexed elements.
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- **start**: `[in] stdlib_complex128_t` starting value.
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- **X**: `[out] stdlib_complex128_t*` input array.
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- **strideX**: `[in] CBLAS_INT` stride length.
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- **offsetX**: `[in] CBLAS_INT` starting index.
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```c
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void API_SUFFIX(stdlib_strided_zunitspace_ndarray)( const CBLAS_INT N, const stdlib_complex128_t start, stdlib_complex128_t *X, const CBLAS_INT strideX, const CBLAS_INT offsetX );
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```
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</section>
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<!-- /.usage -->
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<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="notes">
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</section>
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<!-- /.notes -->
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<!-- C API usage examples. -->
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<section class="examples">
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### Examples
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```c
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#include "stdlib/blas/ext/base/zunitspace.h"
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#include "stdlib/complex/float64/ctor.h"
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#include <stdio.h>
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int main( void ) {
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// Create a strided array of interleaved real and imaginary components:
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double x[] = { 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 };
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// Specify the number of elements:
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const int N = 4;
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// Specify a stride:
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const int strideX = 1;
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// Specify a starting value:
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const stdlib_complex128_t start = stdlib_complex128( 3.0, 0.0 );
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// Fill the array:
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stdlib_strided_zunitspace( N, start, (stdlib_complex128_t *)x, strideX );
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// Print the result:
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for ( int i = 0; i < 8; i++ ) {
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printf( "x[ %i ] = %lf\n", i, x[ i ] );
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}
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}
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```
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</section>
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<!-- /.examples -->
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</section>
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<!-- /.c -->
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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/complex128]: https://github.com/stdlib-js/array-complex128
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[@stdlib/complex/float64/ctor]: https://github.com/stdlib-js/complex-float64-ctor
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[mdn-typed-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray
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</section>
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<!-- /.links -->

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