function getComplex128( arr, idx ) {
	return arr.get( idx );
}
Returns an element from a `Complex128Array`.

@private
@param {Complex128Array} arr - input array
@param {NonNegativeInteger} idx - element index
@returns {number} element value

@example
var Complex128Array = require( '@stdlib/array/complex128' );
var real = require( '@stdlib/complex/float64/real' );
var imag = require( '@stdlib/complex/float64/imag' );

var arr = new Complex128Array( [ 1, 2, 3, 4 ] );

var v = getComplex128( arr, 1 );
// returns <Complex128>

var re = real( v );
// returns 3.0

var im = imag( v );
// returns 4.0