time-to-botec/squiggle/node_modules/@stdlib/math/iter/special/gamma1pm1/README.md

iterGamma1pm1

Create an iterator which computes gamma(x+1) - 1 for each iterated value.

Usage

var iterGamma1pm1 = require( '@stdlib/math/iter/special/gamma1pm1' );

iterGamma1pm1( iterator )

Returns an iterator which iteratively computes gamma(x+1) - 1 without cancellation errors for small x.

var array2iterator = require( '@stdlib/array/to-iterator' );

var it = iterGamma1pm1( array2iterator( [ 0.2, -8.5 ] ) );
// returns <Object>

var v = it.next().value;
// returns ~-0.082

v = it.next().value;
// returns ~-1.0

// ...

The returned iterator protocol-compliant object has the following properties:

• next: function which returns an iterator protocol-compliant object containing the next iterated value (if one exists) assigned to a value property and a done property having a boolean value indicating whether the iterator is finished.
• return: function which closes an iterator and returns a single (optional) argument in an iterator protocol-compliant object.

Notes

• If an iterated value is non-numeric (including NaN), the returned iterator returns NaN. If non-numeric iterated values are possible, you are advised to provide an iterator which type checks and handles non-numeric values accordingly.
• If an environment supports Symbol.iterator and a provided iterator is iterable, the returned iterator is iterable.

Examples

var uniform = require( '@stdlib/random/iter/uniform' );
var iterGamma1pm1 = require( '@stdlib/math/iter/special/gamma1pm1' );

// Create a seeded iterator for generating pseudorandom numbers:
var rand = uniform( -5.0, 5.0, {
    'seed': 1234,
    'iter': 10
});

// Create an iterator which consumes the pseudorandom number iterator:
var it = iterGamma1pm1( rand );

// Perform manual iteration...
var v;
while ( true ) {
    v = it.next();
    if ( v.done ) {
        break;
    }
    console.log( v.value );
}