@stdlib/math-strided-special-sdeg2rad

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sdeg2rad

Convert each element in a single-precision floating-point strided array from degrees to radians.

Installation

npm install @stdlib/math-strided-special-sdeg2rad

Usage

var sdeg2rad = require( '@stdlib/math-strided-special-sdeg2rad' );

sdeg2rad( N, x, strideX, y, strideY )

Converts each element in a single-precision floating-point strided array x from degrees to radians and assigns the results to elements in a single-precision floating-point strided array y.

var Float32Array = require( '@stdlib/array-float32' );

var x = new Float32Array( [ 0.0, 30.0, 45.0, 60.0, 90.0 ] );

// Perform operation in-place:
sdeg2rad( x.length, x, 1, x, 1 );
// x => <Float32Array>[ 0.0, ~0.524, ~0.785, ~1.047, ~1.571 ]

The function accepts the following arguments:

• N: number of indexed elements.
• x: input Float32Array.
• strideX: index increment for x.
• y: output Float32Array.
• 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,

var Float32Array = require( '@stdlib/array-float32' );

var x = new Float32Array( [ 0.0, 30.0, 45.0, 60.0, 90.0, 120.0 ] );
var y = new Float32Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );

sdeg2rad( 3, x, 2, y, -1 );
// y => <Float32Array>[ ~1.571, ~0.785, 0.0, 0.0, 0.0, 0.0 ]

Note that indexing is relative to the first index. To introduce an offset, use typed array views.

var Float32Array = require( '@stdlib/array-float32' );

// Initial arrays...
var x0 = new Float32Array( [ 0.0, 30.0, 45.0, 60.0, 90.0, 120.0 ] );
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

sdeg2rad( 3, x1, -2, y1, 1 );
// y0 => <Float32Array>[ 0.0, 0.0, 0.0, ~2.094, ~1.047, ~0.524 ]

sdeg2rad.ndarray( N, x, strideX, offsetX, y, strideY, offsetY )

Converts each element in a single-precision floating-point strided array x from degrees to radians and assigns the results to elements in a single-precision floating-point strided array y using alternative indexing semantics.

var Float32Array = require( '@stdlib/array-float32' );

var x = new Float32Array( [ 0.0, 30.0, 45.0, 60.0, 90.0 ] );
var y = new Float32Array( [ 0.0, 0.0, 0.0, 0.0, 0.0 ] );

sdeg2rad.ndarray( x.length, x, 1, 0, y, 1, 0 );
// y => <Float32Array>[ 0.0, ~0.524, ~0.785, ~1.047, ~1.571 ]

The function accepts the following additional arguments:

• offsetX: starting index for x.
• offsetY: starting index for y.

While typed array 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,

var Float32Array = require( '@stdlib/array-float32' );

var x = new Float32Array( [ 0.0, 30.0, 45.0, 60.0, 90.0, 120.0 ] );
var y = new Float32Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );

sdeg2rad.ndarray( 3, x, 2, 1, y, -1, y.length-1 );
// y => <Float32Array>[ 0.0, 0.0, 0.0, ~2.094, ~1.047, ~0.524 ]

Examples

var uniform = require( '@stdlib/random-base-uniform' );
var Float32Array = require( '@stdlib/array-float32' );
var sdeg2rad = require( '@stdlib/math-strided-special-sdeg2rad' );

var x = new Float32Array( 10 );
var y = new Float32Array( 10 );

var i;
for ( i = 0; i < x.length; i++ ) {
    x[ i ] = uniform( -180.0, 180.0 );
}
console.log( x );
console.log( y );

sdeg2rad.ndarray( x.length, x, 1, 0, y, -1, y.length-1 );
console.log( y );

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C APIs

Usage

#include "stdlib/math/strided/special/sdeg2rad.h"

stdlib_strided_sdeg2rad( N, *X, strideX, *Y, strideY )

Converts each element in a single-precision floating-point strided array x from degrees to radians and assigns the results to elements in a single-precision floating-point strided array y.

#include <stdint.h>

const float X[] = { 0.0, 30.0, 45.0, 60.0, 90.0, 120.0, 150.0, 180.0 };
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_sdeg2rad( 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.

void stdlib_strided_sdeg2rad( const int64_t N, const float *X, const int64_t strideX, float *Y, const int64_t strideY );

Examples

#include "stdlib/math/strided/special/sdeg2rad.h"
#include <stdint.h>
#include <stdio.h>

int main( void ) {
    // Create an input strided array:
    const float X[] = { 0.0, 30.0, 45.0, 60.0, 90.0, 120.0, 150.0, 180.0 };

    // 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_sdeg2rad( N, X, strideX, Y, strideY );

    // Print the results:
    for ( int i = 0; i < 8; i++ ) {
        printf( "Y[ %i ] = %f\n", i, Y[ i ] );
    }
}

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See Also

• @stdlib/math-strided/special/ddeg2rad: convert each element in a double-precision floating-point strided array from degrees to radians.
• @stdlib/math-strided/special/deg2rad: convert each element in a strided array from degrees to radians.

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Notice

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For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

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License

See LICENSE.

Copyright

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