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Convert each element in a double-precision floating-point strided array from degrees to radians.
npm install @stdlib/math-strided-special-ddeg2radAlternatively,
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denobranch (see README for usage intructions). - For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the
umdbranch (see README).
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To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.
var ddeg2rad = require( '@stdlib/math-strided-special-ddeg2rad' );Converts each element in a double-precision floating-point strided array x from degrees to radians and assigns the results to elements in a double-precision floating-point strided array y.
var Float64Array = require( '@stdlib/array-float64' );
var x = new Float64Array( [ 0.0, 30.0, 45.0, 60.0, 90.0 ] );
// Perform operation in-place:
ddeg2rad( x.length, x, 1, x, 1 );
// x => <Float64Array>[ 0.0, ~0.524, ~0.785, ~1.047, ~1.571 ]The function accepts the following arguments:
- N: number of indexed elements.
- x: input
Float64Array. - strideX: index increment for
x. - y: output
Float64Array. - 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 Float64Array = require( '@stdlib/array-float64' );
var x = new Float64Array( [ 0.0, 30.0, 45.0, 60.0, 90.0, 120.0 ] );
var y = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );
ddeg2rad( 3, x, 2, y, -1 );
// y => <Float64Array>[ ~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 Float64Array = require( '@stdlib/array-float64' );
// Initial arrays...
var x0 = new Float64Array( [ 0.0, 30.0, 45.0, 60.0, 90.0, 120.0 ] );
var y0 = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );
// Create offset views...
var x1 = new Float64Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
var y1 = new Float64Array( y0.buffer, y0.BYTES_PER_ELEMENT*3 ); // start at 4th element
ddeg2rad( 3, x1, -2, y1, 1 );
// y0 => <Float64Array>[ 0.0, 0.0, 0.0, ~2.094, ~1.047, ~0.524 ]Converts each element in a double-precision floating-point strided array x from degrees to radians and assigns the results to elements in a double-precision floating-point strided array y using alternative indexing semantics.
var Float64Array = require( '@stdlib/array-float64' );
var x = new Float64Array( [ 0.0, 30.0, 45.0, 60.0, 90.0 ] );
var y = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0 ] );
ddeg2rad.ndarray( x.length, x, 1, 0, y, 1, 0 );
// y => <Float64Array>[ 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 Float64Array = require( '@stdlib/array-float64' );
var x = new Float64Array( [ 0.0, 30.0, 45.0, 60.0, 90.0, 120.0 ] );
var y = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );
ddeg2rad.ndarray( 3, x, 2, 1, y, -1, y.length-1 );
// y => <Float64Array>[ 0.0, 0.0, 0.0, ~2.094, ~1.047, ~0.524 ]var uniform = require( '@stdlib/random-base-uniform' );
var Float64Array = require( '@stdlib/array-float64' );
var ddeg2rad = require( '@stdlib/math-strided-special-ddeg2rad' );
var x = new Float64Array( 10 );
var y = new Float64Array( 10 );
var i;
for ( i = 0; i < x.length; i++ ) {
x[ i ] = uniform( -180.0, 180.0 );
}
console.log( x );
console.log( y );
ddeg2rad.ndarray( x.length, x, 1, 0, y, -1, y.length-1 );
console.log( y );#include "stdlib/math/strided/special/ddeg2rad.h"Converts each element in a double-precision floating-point strided array x from degrees to radians and assigns the results to elements in a double-precision floating-point strided array y.
#include <stdint.h>
const double X[] = { 0.0, 30.0, 45.0, 60.0, 90.0, 120.0, 150.0, 180.0 };
double Y[] = { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 };
const int64_t N = 4;
stdlib_strided_ddeg2rad( N, X, 2, Y, 2 );The function accepts the following arguments:
- N:
[in] int64_tnumber of indexed elements. - X:
[in] double*input array. - strideX:
[in] int64_tindex increment forX. - Y:
[out] double*output array. - strideY:
[in] int64_tindex increment forY.
void stdlib_strided_ddeg2rad( const int64_t N, const double *X, const int64_t strideX, double *Y, const int64_t strideY );#include "stdlib/math/strided/special/ddeg2rad.h"
#include <stdint.h>
#include <stdio.h>
int main( void ) {
// Create an input strided array:
const double X[] = { 0.0, 30.0, 45.0, 60.0, 90.0, 120.0, 150.0, 180.0 };
// Create an output strided array:
double 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_ddeg2rad( N, X, strideX, Y, strideY );
// Print the results:
for ( int i = 0; i < 8; i++ ) {
printf( "Y[ %i ] = %lf\n", i, Y[ i ] );
}
}@stdlib/math-strided/special/deg2rad: convert each element in a strided array from degrees to radians.@stdlib/math-strided/special/sdeg2rad: convert each element in a single-precision floating-point strided array from degrees to radians.
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