Common Logarithm
Evaluate the common logarithm.
The common logarithm (logarithm with base 10) is defined for any positive real number as
Usage
var log10 = require( '@stdlib/math/base/special/log10' );
log10( x )
Evaluates the common logarithm.
var v = log10( 100.0 );
// returns 2.0
v = log10( 8.0 );
// returns ~0.903
v = log10( 0.0 );
// returns -Infinity
v = log10( Infinity );
// returns Infinity
v = log10( NaN );
// returns NaN
For negative numbers, the common logarithm is not defined.
var v = log10( -4.0 );
// returns NaN
Examples
var randu = require( '@stdlib/random/base/randu' );
var round = require( '@stdlib/math/base/special/round' );
var log10 = require( '@stdlib/math/base/special/log10' );
var x;
var i;
for ( i = 0; i < 100; i++ ) {
x = round( randu() * 100.0 );
console.log( 'log10(%d) = %d', x, log10( x ) );
}
C APIs
Usage
#include "stdlib/math/base/special/log10.h"
stdlib_base_log10( x )
Evaluates the common logarithm.
double out = stdlib_base_log10( 100.0 );
// returns 2.0
out = stdlib_base_log10( 8.0 );
// returns ~0.903
The function accepts the following arguments:
- x:
[in] double
input value.
double stdlib_base_log10( const double x );
Examples
#include "stdlib/math/base/special/log10.h"
#include <stdlib.h>
#include <stdio.h>
int main() {
double x;
double v;
int i;
for ( i = 0; i < 100; i++ ) {
x = ( (double)rand() / (double)RAND_MAX ) * 100.0;
v = stdlib_base_log10( x );
printf( "log10(%lf) = %lf\n", x, v );
}
}