Test if a double-precision floating-point number is a probability.
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> Test if a double-precision floating-point number is a probability.
``bash`
npm install @stdlib/math-base-assert-is-probability
`javascript`
var isProbability = require( '@stdlib/math-base-assert-is-probability' );
#### isProbability( x )
Tests if a double-precision floating-point number is a probability.
`javascript
var bool = isProbability( 0.5 );
// returns true
bool = isProbability( 3.14 );
// returns false
bool = isProbability( NaN );
// returns false
`
`javascript
var uniform = require( '@stdlib/random-array-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var isProbability = require( '@stdlib/math-base-assert-is-probability' );
var opts = {
'dtype': 'float64'
};
var x = uniform( 100, -1.0, 1.0, opts );
function isProbabilityWrapper( value ) {
return ( isProbability( value ) ) ? 'a probability' : 'not a probability';
}
logEachMap( '%0.4f is %s', x, isProbabilityWrapper );
`
*
`c`
#include "stdlib/math/base/assert/is_probability.h"
#### stdlib_base_is_probability( x )
Tests if a double-precision floating-point number is a probability.
`c
#include
bool out = stdlib_base_is_probability( 0.5 );
// returns true
out = stdlib_base_is_probability( 3.14 );
// returns false
`
The function accepts the following arguments:
- x: [in] double input value.
`c`
bool stdlib_base_is_probability( const double x );
`c
#include "stdlib/math/base/assert/is_probability.h"
#include
#include
#include
int main( void ) {
double x;
bool v;
int i;
for ( i = 0; i < 100; i++ ) {
x = ( ( (double)rand() / (double)RAND_MAX ) * 2.0 ) - 1.0;
v = stdlib_base_is_probability( x );
printf( "%lf is %sa probability\n", x, ( v ) ? "" : "not " );
}
}
`
*
This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].
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