function mulBy( N, x, sx, y, sy, z, sz, clbk, thisArg ) {
	return mapBy2( N, x, sx, y, sy, z, sz, mul, clbk, thisArg );
}
Performs element-wise multiplication of two strided arrays via a callback function and assigns each result to an element in an output strided array.

@param {NonNegativeInteger} N - number of indexed elements
@param {Collection} x - input array/collection
@param {integer} sx - `x` stride length
@param {Collection} y - input array/collection
@param {integer} sy - `y` stride length
@param {Collection} z - destination array/collection
@param {integer} sz - `z` stride length
@param {Callback} clbk - callback
@param {*} [thisArg] - callback execution context
@returns {Collection} `z`

@example
function accessor( values ) {
    return values;
}

var x = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
var y = [ 11.0, 12.0, 13.0, 14.0, 15.0 ];
var z = [ 0.0, 0.0, 0.0, 0.0, 0.0 ];

mulBy( x.length, x, 1, y, 1, z, 1, accessor );

console.log( z );
// => [ 11.0, 24.0, 39.0, 56.0, 75.0 ]