@stdlib/array-typed-real NPM

Typed Arrays

Create a typed array.

Installation

npm install @stdlib/array-typed-real

Usage

var realarray = require( '@stdlib/array-typed-real' );

realarray( [dtype] )

Creates a typed array having a specified data type dtype.

var arr = realarray();
// returns <Float64Array>

The function recognizes the following data types:

float64: double-precision floating-point numbers (IEEE 754)
float32: single-precision floating-point numbers (IEEE 754)
int32: 32-bit two's complement signed integers
uint32: 32-bit unsigned integers
int16: 16-bit two's complement signed integers
uint16: 16-bit unsigned integers
int8: 8-bit two's complement signed integers
uint8: 8-bit unsigned integers
uint8c: 8-bit unsigned integers clamped to 0-255

By default, the output typed array data type is float64. To specify an alternative data type, provide a dtype argument.

var arr = realarray( 'int32' );
// returns <Int32Array>

realarray( length[, dtype] )

Returns a typed array having a specified length.

var arr1 = realarray( 5 );
// returns <Float64Array>[ 0.0, 0.0, 0.0, 0.0, 0.0 ]

var arr2 = realarray( 5, 'uint8' );
// returns <Uint8Array>[ 0, 0, 0, 0, 0 ]

realarray( realarray[, dtype] )

Creates a typed array from another typed array.

var arr1 = realarray( [ 5.0, -3.0, 2.0 ] );
// returns <Float64Array>[ 5.0, -3.0, 2.0 ]

var arr2 = realarray( arr1 );
// returns <Float64Array>[ 5.0, -3.0, 2.0 ]

var arr3 = realarray( arr1, 'int32' );
// returns <Int32Array>[ 5, -3, 2 ]

realarray( obj[, dtype] )

Creates a typed array from an array-like object or iterable.

var arr1 = realarray( [ 0.5, 0.5, 0.5 ] );
// returns <Float64Array>[ 0.5, 0.5, 0.5 ]

var arr2 = realarray( [ 0.5, 0.5, 0.5 ], 'float32' );
// returns <Float32Array>[ 0.5, 0.5, 0.5 ]

realarray( buffer[, byteOffset[, length]][, dtype] )

Returns a typed array view of an ArrayBuffer.

var ArrayBuffer = require( '@stdlib/array-buffer' );
var buf = new ArrayBuffer( 32 );

var arr1 = realarray( buf );
// returns <Float64Array>[ 0.0, 0.0, 0.0, 0.0 ]

var arr2 = realarray( buf, 'float32' );
// returns <Float32Array>[ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ]

var arr3 = realarray( buf, 16 );
// returns <Float64Array>[ 0.0, 0.0 ]

var arr4 = realarray( buf, 16, 'float32' );
// returns <Float32Array>[ 0.0, 0.0, 0.0, 0.0 ]

var arr5 = realarray( buf, 16, 1 );
// returns <Float64Array>[ 0.0 ]

var arr6 = realarray( buf, 10, 4, 'int16' );
// returns <Int16Array>[ 0, 0, 0, 0 ]

Examples

var randu = require( '@stdlib/random-base-randu' );
var realarray = require( '@stdlib/array-typed-real' );

var arr = realarray( 100, 'float64' );

var i;
for ( i = 0; i < arr.length; i++ ) {
    arr[ i ] = randu() * 100.0;
}
console.log( arr );

Notice

This package is part of 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, see the main project repository.