incrmaxabs

Compute a maximum absolute value incrementally.

Usage

var incrmaxabs = require( '@stdlib/stats/incr/maxabs' );

incrmaxabs()

Returns an accumulator function which incrementally computes a maximum absolute value.

var accumulator = incrmaxabs();

accumulator( [x] )

If provided an input value x, the accumulator function returns an updated maximum absolute value. If not provided an input value x, the accumulator function returns the current maximum absolute value.

var accumulator = incrmaxabs();

var max = accumulator( 2.0 );
// returns 2.0

max = accumulator( 1.0 );
// returns 2.0

max = accumulator( -3.0 );
// returns 3.0

max = accumulator();
// returns 3.0

Notes

  • Input values are not type checked. If provided NaN, the accumulated value is NaN for all future invocations. If non-numeric inputs are possible, you are advised to type check and handle accordingly before passing the value to the accumulator function.

Examples

var randu = require( '@stdlib/random/base/randu' );
var incrmaxabs = require( '@stdlib/stats/incr/maxabs' );

var accumulator;
var v;
var i;

// Initialize an accumulator:
accumulator = incrmaxabs();

// For each simulated datum, update the maximum absolute value...
for ( i = 0; i < 100; i++ ) {
    v = ( randu()*100.0 ) - 50.0;
    accumulator( v );
}
console.log( accumulator() );