itercuprod

Create an iterator which iteratively computes a cumulative product.

The cumulative product is defined as

Usage

var itercuprod = require( '@stdlib/stats/iter/cuprod' );


itercuprod( iterator )

Returns an iterator which iteratively computes a cumulative product.

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

var arr = array2iterator( [ 2.0, 1.0, 3.0, -7.0, -5.0 ] );
var it = itercuprod( arr );

var p = it.next().value;
// returns 2.0

p = it.next().value;
// returns 2.0

p = it.next().value;
// returns 6.0

p = it.next().value;
// returns -42.0

p = it.next().value;
// returns 210.0


Notes

• If an iterated value is non-numeric (including NaN), the function returns NaN for all future iterations. If non-numeric iterated values are possible, you are advised to provide an iterator which type checks and handles non-numeric values accordingly.
• For iterators which can generate many values or which may output large numbers, care should be taken to prevent overflow.

Examples

var runif = require( '@stdlib/random/iter/uniform' );
var itercuprod = require( '@stdlib/stats/iter/cuprod' );

// Create an iterator for generating uniformly distributed pseudorandom numbers:
var rand = runif( -10.0, 10.0, {
'seed': 1234,
'iter': 100
});

// Create an iterator for iteratively computing a cumulative product:
var it = itercuprod( rand );

// Perform manual iteration...
var v;
while ( true ) {
v = it.next();
if ( typeof v.value === 'number' ) {
console.log( 'prod: %d', v.value );
}
if ( v.done ) {
break;
}
}