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Evaluates the natural logarithm of
1+exp(x).
import log1pexp from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-log1pexp@esm/index.mjs';Evaluates the natural logarithm of 1+exp(x).
var y = log1pexp( -10.0 );
// returns ~0.000045
y = log1pexp( 0.0 );
// returns ~0.693147
y = log1pexp( 5.0 );
// returns ~5.006715
y = log1pexp( 34.0 );
// returns 34.0
y = log1pexp( NaN );
// returns NaN<!DOCTYPE html>
<html lang="en">
<body>
<script type="module">
import incrspace from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-base-incrspace@esm/index.mjs';
import log1pexp from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-log1pexp@esm/index.mjs';
var x = incrspace( -10.0, 10.0, 0.01 );
var i;
for ( i = 0; i < x.length; i++ ) {
console.log( 'x: %d, f(x): %d', x[ i ], log1pexp( x[ i ] ) );
}
</script>
</body>
</html>@stdlib/math-base/special/exp: natural exponential function.@stdlib/math-base/special/ln: evaluate the natural logarithm of a double-precision floating-point number.@stdlib/math-base/special/log1mexp: evaluate the natural logarithm of 1-exp(-|x|).@stdlib/math-base/special/log1p: evaluate the natural logarithm of 1+x.
This package is part of stdlib, a standard library 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.
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