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‎CHANGELOG.md

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### Features
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- [`22f1408`](https://github.com/stdlib-js/stdlib/commit/22f140863e59a9e1a2f89a6912a0c520a7fc7956) - add `csum` to namespace
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- [`10ccb4a`](https://github.com/stdlib-js/stdlib/commit/10ccb4a44321d0caf5602042c78b49232de2b1dc) - add `blas/ext/base/csum`
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- [`4f9ada3`](https://github.com/stdlib-js/stdlib/commit/4f9ada3914fe2a20811614089c1d2ce8bc6a15f0) - add `csumkbn` to namespace
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- [`c682e65`](https://github.com/stdlib-js/stdlib/commit/c682e653f19695066709857256c8c50cfbb24ac0) - add `blas/ext/base/csumkbn`
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- [`ef876c4`](https://github.com/stdlib-js/stdlib/commit/ef876c4aa3c97ce2fb042a0d48c852a448775fad) - add `zsum` to namespace
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- [`c76305e`](https://github.com/stdlib-js/stdlib/commit/c76305ee9931b510e2aec54ec1da3997845d40f4) - add `blas/ext/base/zsum`
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- [`e030bba`](https://github.com/stdlib-js/stdlib/commit/e030bba632158023584c3e28c080fdf289d15014) - add `gnannsumpw` to namespace
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- [`cbd656d`](https://github.com/stdlib-js/stdlib/commit/cbd656db90d14e150baa2a23deb44cb645ef2298) - add `blas/ext/base/gnannsumpw`
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- [`7324255`](https://github.com/stdlib-js/stdlib/commit/7324255304f2fdb5afddd9166579122fcdc2aa2a) - add `zsumkbn` to namespace
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<details>
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- [`22f1408`](https://github.com/stdlib-js/stdlib/commit/22f140863e59a9e1a2f89a6912a0c520a7fc7956) - **feat:** add `csum` to namespace _(by Athan Reines)_
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- [`10ccb4a`](https://github.com/stdlib-js/stdlib/commit/10ccb4a44321d0caf5602042c78b49232de2b1dc) - **feat:** add `blas/ext/base/csum` _(by Athan Reines)_
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- [`84af975`](https://github.com/stdlib-js/stdlib/commit/84af975367b6d0694ffbd0a27b7da0a0c144b4fb) - **chore:** clean-up _(by Athan Reines)_
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- [`4f9ada3`](https://github.com/stdlib-js/stdlib/commit/4f9ada3914fe2a20811614089c1d2ce8bc6a15f0) - **feat:** add `csumkbn` to namespace _(by Athan Reines)_
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- [`c682e65`](https://github.com/stdlib-js/stdlib/commit/c682e653f19695066709857256c8c50cfbb24ac0) - **feat:** add `blas/ext/base/csumkbn` _(by Athan Reines)_
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- [`ef876c4`](https://github.com/stdlib-js/stdlib/commit/ef876c4aa3c97ce2fb042a0d48c852a448775fad) - **feat:** add `zsum` to namespace _(by Athan Reines)_
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- [`c76305e`](https://github.com/stdlib-js/stdlib/commit/c76305ee9931b510e2aec54ec1da3997845d40f4) - **feat:** add `blas/ext/base/zsum` _(by Athan Reines)_
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- [`12b992e`](https://github.com/stdlib-js/stdlib/commit/12b992eca7ac911aa20fe41aa4fffc9dec128c9d) - **test:** address failing test cases _(by Athan Reines)_
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- [`b729264`](https://github.com/stdlib-js/stdlib/commit/b729264841b1af47c4831a8b38ebe51882017381) - **bench:** fix package path _(by Athan Reines)_
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- [`15922b7`](https://github.com/stdlib-js/stdlib/commit/15922b7bcaaaa3eb81bc6fec90898f0bd52e66fc) - **fix:** address indexing bug _(by Athan Reines)_

‎CONTRIBUTORS

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Stephannie Jiménez Gacha <steff456@hotmail.com>
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Suhaib Ilahi <suhaib.elahi87@gmail.com>
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Suraj Kumar <125961509+kumarsuraj212003@users.noreply.github.com>
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Swapnil Hajare <69076366+Swapnil-2502@users.noreply.github.com>
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Tanishq Ahuja <68651083+TheGEN1U5@users.noreply.github.com>
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Tirtadwipa Manunggal <tirtadwipa.manunggal@gmail.com>
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Tudor Pagu <104032457+tudor-pagu@users.noreply.github.com>

‎ext/base/csum/README.md

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<!--
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@license Apache-2.0
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Copyright (c) 2025 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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# csum
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> Calculate the sum of single-precision complex floating-point strided array elements.
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<section class="intro">
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</section>
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<!-- /.intro -->
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<section class="usage">
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## Usage
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```javascript
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var csum = require( '@stdlib/blas/ext/base/csum' );
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```
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#### csum( N, x, strideX )
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Computes the sum of single-precision complex floating-point strided array elements.
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```javascript
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var Complex64Array = require( '@stdlib/array/complex64' );
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var x = new Complex64Array( [ 1.0, -2.0, 2.0, 3.0 ] );
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var v = csum( x.length, x, 1 );
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// returns <Complex64>[ 3.0, 1.0 ]
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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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- **x**: input [`Complex64Array`][@stdlib/array/complex64].
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- **strideX**: stride length for `x`.
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The `N` and stride parameters determine which elements in the strided array are accessed at runtime. For example, to compute the sum of every other element:
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```javascript
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var Complex64Array = require( '@stdlib/array/complex64' );
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var x = new Complex64Array( [ 1.0, 2.0, 2.0, -7.0, -2.0, 3.0, 4.0, 2.0 ] );
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var v = csum( 2, x, 2 );
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// returns <Complex64>[ -1.0, 5.0 ]
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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 stdlib/capitalized-comments -->
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```javascript
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var Complex64Array = require( '@stdlib/array/complex64' );
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var x0 = new Complex64Array( [ 2.0, 1.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0 ] );
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var x1 = new Complex64Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
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var v = csum( 2, x1, 2 );
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// returns <Complex64>[ 5.0, 2.0 ]
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```
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#### csum.ndarray( N, x, strideX, offsetX )
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Computes the sum of single-precision complex floating-point strided array elements using alternative indexing semantics.
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```javascript
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var Complex64Array = require( '@stdlib/array/complex64' );
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var x = new Complex64Array( [ 1.0, -2.0, 2.0, 3.0 ] );
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var v = csum.ndarray( 2, x, 1, 0 );
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// returns <Complex64>[ 3.0, 1.0 ]
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```
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The function has the following additional parameters:
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- **offsetX**: starting index for `x`.
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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 calculate the sum of every other element starting from the second element:
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```javascript
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var Complex64Array = require( '@stdlib/array/complex64' );
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var x = new Complex64Array( [ 2.0, 1.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0 ] );
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var v = csum.ndarray( 2, x, 2, 1 );
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// returns <Complex64>[ 5.0, 2.0 ]
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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 `0.0 + 0.0i`.
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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 Complex64Array = require( '@stdlib/array/complex64' );
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var csum = require( '@stdlib/blas/ext/base/csum' );
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var xbuf = discreteUniform( 10, -100, 100, {
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'dtype': 'float32'
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});
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console.log( xbuf );
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var x = new Complex64Array( xbuf );
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var v = csum( x.length, x, 1 );
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console.log( v );
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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/csum.h"
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```
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#### stdlib_strided_csum( N, \*X, strideX )
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Computes the sum of single-precision complex floating-point strided array elements.
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```c
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#include "stdlib/complex/float32/ctor.h"
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const stdlib_complex64_t x[] = {
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stdlib_complex64( 1.0f, 2.0f ),
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stdlib_complex64( 3.0f, 4.0f )
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};
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stdlib_complex64_t v = stdlib_strided_csum( 2, 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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- **X**: `[in] stdlib_complex64_t*` input array.
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- **strideX**: `[in] CBLAS_INT` stride length for `X`.
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```c
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stdlib_complex64_t stdlib_strided_csum( const CBLAS_INT N, const stdlib_complex64_t *X, const CBLAS_INT strideX );
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```
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#### stdlib_strided_csum_ndarray( N, \*X, strideX, offsetX )
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Computes the sum of single-precision complex floating-point strided array elements using alternative indexing semantics.
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```c
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#include "stdlib/complex/float32/ctor.h"
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const stdlib_complex64_t x[] = {
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stdlib_complex64( 1.0f, 2.0f ),
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stdlib_complex64( 3.0f, 4.0f )
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};
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stdlib_complex64_t v = stdlib_strided_csum_ndarray( 2, 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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- **X**: `[in] stdlib_complex64_t*` input array.
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- **strideX**: `[in] CBLAS_INT` stride length for `X`.
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- **offsetX**: `[in] CBLAS_INT` starting index for `X`.
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```c
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stdlib_complex64_t stdlib_strided_csum_ndarray( const CBLAS_INT N, const stdlib_complex64_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/csum.h"
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#include "stdlib/complex/float32/ctor.h"
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#include "stdlib/complex/float32/real.h"
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#include "stdlib/complex/float32/imag.h"
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#include <stdio.h>
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int main( void ) {
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// Create a strided array:
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const stdlib_complex64_t x[] = {
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stdlib_complex64( 1.0f, 2.0f ),
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stdlib_complex64( 3.0f, 4.0f ),
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stdlib_complex64( 5.0f, 6.0f ),
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stdlib_complex64( 7.0f, 8.0f )
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};
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// Specify the number of elements:
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const int N = 4;
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// Specify the stride length:
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const int strideX = 1;
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// Compute the sum:
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stdlib_complex64_t v = stdlib_strided_csum( N, x, strideX );
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// Print the result:
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printf( "sum: %f + %fi\n", stdlib_complex64_real( v ), stdlib_complex64_imag( v ) );
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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 class="references">
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</section>
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<!-- /.references -->
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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/complex64]: https://github.com/stdlib-js/array-complex64
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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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