Package Exports
- @stdlib/math-base-special-kernel-log1p
- @stdlib/math-base-special-kernel-log1p/dist
- @stdlib/math-base-special-kernel-log1p/dist/index.js
- @stdlib/math-base-special-kernel-log1p/lib/index.js
This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (@stdlib/math-base-special-kernel-log1p) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.
Readme
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kernelLog1p
Compute
log(1+f) - ffor1+fin~[sqrt(2)/2, sqrt(2)].
Installation
npm install @stdlib/math-base-special-kernel-log1pUsage
var kernelLog1p = require( '@stdlib/math-base-special-kernel-log1p' );kernelLog1p( f )
Computes log(1+f) - f for 1+f in ~[sqrt(2)/2, sqrt(2)].
var v = kernelLog1p( 1.0 );
// returns ~0.1931
v = kernelLog1p( 1.4142135623730951 );
// returns ~0.4672
v = kernelLog1p( NaN );
// returns NaNNotes
- This function is a helper function for computing logarithms in base
e. Argument reduction and adding the final term of the polynomial must be done by the caller for increased accuracy when different bases are used. For reference, see@stdlib/math-base/special/log2and@stdlib/math/base/special/log10.
Examples
var linspace = require( '@stdlib/array-base-linspace' );
var sqrt = require( '@stdlib/math-base-special-sqrt' );
var kernelLog1p = require( '@stdlib/math-base-special-kernel-log1p' );
var x = linspace( sqrt( 2.0 ) / 2.0, sqrt( 2.0 ), 100 );
var i;
for ( i = 0; i < x.length; i++ ) {
console.log( 'kernelLog1p(%d) = %d', x[ i ], kernelLog1p( x[ i ] ) );
}C APIs
Usage
#include "stdlib/math/base/special/kernel_log1p.h"stdlib_base_kernel_log1p( f )
Computes log(1+f) - f for 1+f in ~[sqrt(2)/2, sqrt(2)].
double out = stdlib_base_kernel_log1p( 1.0 );
// returns ~0.1931
out = stdlib_base_kernel_log1p( 1.4142135623730951 );
// returns ~0.4672The function accepts the following arguments:
- f:
[in] doubleinput value.
double stdlib_base_kernel_log1p( const double f );Examples
#include "stdlib/math/base/special/kernel_log1p.h"
#include <stdio.h>
int main( void ) {
const double x[] = { 0.7071, 0.7856, 0.8642, 0.9428, 1.0213, 1.0999, 1.1785, 1.2570, 1.3356, 1.4142 };
double out;
int i;
for ( i = 0; i < 10; i++ ) {
out = stdlib_base_kernel_log1p( x[ i ] );
printf ( "x[ i ]: %lf, out: %lf\n", x[ i ], out );
}
}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.
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Copyright
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