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# strunc [![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] > Round each element in a single-precision floating-point strided array toward zero.
## Installation ```bash npm install @stdlib/math-strided-special-strunc ```
## Usage ```javascript var strunc = require( '@stdlib/math-strided-special-strunc' ); ``` #### strunc( N, x, strideX, y, strideY ) Rounds each element in a single-precision floating-point strided array `x` toward zero and assigns the results to elements in a single-precision floating-point strided array `y`. ```javascript var Float32Array = require( '@stdlib/array-float32' ); var x = new Float32Array( [ 1.1, 2.5, -3.5, 4.0, -5.9 ] ); // Perform operation in-place: strunc( x.length, x, 1, x, 1 ); // x => [ 1.0, 2.0, -3.0, 4.0, -5.0 ] ``` The function accepts the following arguments: - **N**: number of indexed elements. - **x**: input [`Float32Array`][@stdlib/array/float32]. - **strideX**: index increment for `x`. - **y**: output [`Float32Array`][@stdlib/array/float32]. - **strideY**: index increment for `y`. The `N` and `stride` parameters determine which elements in `x` and `y` are accessed at runtime. For example, to index every other value in `x` and to index the first `N` elements of `y` in reverse order, ```javascript var Float32Array = require( '@stdlib/array-float32' ); var x = new Float32Array( [ 1.1, 2.5, -3.5, 4.0, -5.9, 6.4 ] ); var y = new Float32Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] ); strunc( 3, x, 2, y, -1 ); // y => [ -5.0, -3.0, 1.0, 0.0, 0.0, 0.0 ] ``` Note that indexing is relative to the first index. To introduce an offset, use [`typed array`][@stdlib/array/float32] views. ```javascript var Float32Array = require( '@stdlib/array-float32' ); // Initial arrays... var x0 = new Float32Array( [ 1.1, 2.5, -3.5, 4.0, -5.9, 6.4 ] ); var y0 = new Float32Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] ); // Create offset views... var x1 = new Float32Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element var y1 = new Float32Array( y0.buffer, y0.BYTES_PER_ELEMENT*3 ); // start at 4th element strunc( 3, x1, -2, y1, 1 ); // y0 => [ 0.0, 0.0, 0.0, 6.0, 4.0, 2.0 ] ``` #### strunc.ndarray( N, x, strideX, offsetX, y, strideY, offsetY ) Rounds each element in a single-precision floating-point strided array `x` toward zero and assigns the results to elements in a single-precision floating-point strided array `y` using alternative indexing semantics. ```javascript var Float32Array = require( '@stdlib/array-float32' ); var x = new Float32Array( [ 1.1, 2.5, -3.5, 4.0, -5.9 ] ); var y = new Float32Array( [ 0.0, 0.0, 0.0, 0.0, 0.0 ] ); strunc.ndarray( x.length, x, 1, 0, y, 1, 0 ); // y => [ 1.0, 2.0, -3.0, 4.0, -5.0 ] ``` The function accepts the following additional arguments: - **offsetX**: starting index for `x`. - **offsetY**: starting index for `y`. While [`typed array`][@stdlib/array/float32] views mandate a view offset based on the underlying `buffer`, the `offsetX` and `offsetY` parameters support indexing semantics based on starting indices. For example, to index every other value in `x` starting from the second value and to index the last `N` elements in `y`, ```javascript var Float32Array = require( '@stdlib/array-float32' ); var x = new Float32Array( [ 1.1, 2.5, -3.5, 4.0, -5.9, 6.4 ] ); var y = new Float32Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] ); strunc.ndarray( 3, x, 2, 1, y, -1, y.length-1 ); // y => [ 0.0, 0.0, 0.0, 6.0, 4.0, 2.0 ] ```
## Examples ```javascript var uniform = require( '@stdlib/random-base-uniform' ); var Float32Array = require( '@stdlib/array-float32' ); var strunc = require( '@stdlib/math-strided-special-strunc' ); var x = new Float32Array( 10 ); var y = new Float32Array( 10 ); var i; for ( i = 0; i < x.length; i++ ) { x[ i ] = uniform( -10.0, 10.0 ); } console.log( x ); console.log( y ); strunc.ndarray( x.length, x, 1, 0, y, -1, y.length-1 ); console.log( y ); ```
* * *
## C APIs
### Usage ```c #include "stdlib/math/strided/special/strunc.h" ``` #### stdlib_strided_strunc( N, \*X, strideX, \*Y, strideY ) Rounds each element in a single-precision floating-point strided array `X` toward zero and assigns the results to elements in a single-precision floating-point strided array `Y`. ```c #include const float X[] = { 1.1, 2.5, -3.5, 4.0, -5.9, 6.4, -7.0, 8.2 }; float Y[] = { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 }; const int64_t N = 4; stdlib_strided_strunc( N, X, 2, Y, 2 ); ``` The function accepts the following arguments: - **N**: `[in] int64_t` number of indexed elements. - **X**: `[in] float*` input array. - **strideX**: `[in] int64_t` index increment for `X`. - **Y**: `[out] float*` output array. - **strideY**: `[in] int64_t` index increment for `Y`. ```c void stdlib_strided_strunc( const int64_t N, const float *X, const int64_t strideX, float *Y, const int64_t strideY ); ```
### Examples ```c #include "stdlib/math/strided/special/strunc.h" #include #include int main( void ) { // Create an input strided array: const float X[] = { 1.1, 2.5, -3.5, 4.0, -5.9, 6.4, -7.0, 8.2 }; // Create an output strided array: float Y[] = { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 }; // Specify the number of elements: const int64_t N = 4; // Specify the stride lengths: const int64_t strideX = 2; const int64_t strideY = 2; // Compute the results: stdlib_strided_strunc( N, X, strideX, Y, strideY ); // Print the results: for ( int i = 0; i < 8; i++ ) { printf( "Y[ %i ] = %f\n", i, Y[ i ] ); } } ```
* * * ## See Also - [`@stdlib/math-strided/special/dtrunc`][@stdlib/math/strided/special/dtrunc]: round each element in a double-precision floating-point strided array toward zero. - [`@stdlib/math-strided/special/sceil`][@stdlib/math/strided/special/sceil]: round each element in a single-precision floating-point strided array toward positive infinity. - [`@stdlib/math-strided/special/sfloor`][@stdlib/math/strided/special/sfloor]: round each element in a single-precision floating-point strided array toward negative infinity. - [`@stdlib/math-strided/special/trunc`][@stdlib/math/strided/special/trunc]: round each element in a strided array toward zero.
* * * ## Notice This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more. For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib]. #### Community [![Chat][chat-image]][chat-url] --- ## License See [LICENSE][stdlib-license]. ## Copyright Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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