function minBy( N, x, strideX, clbk, thisArg ) {
	return ndarray( N, x, strideX, stride2offset( N, strideX ), clbk, thisArg );
}
Computes the minimum value of a strided array via a callback function.

@param {PositiveInteger} N - number of indexed elements
@param {Collection} x - input array
@param {integer} strideX - index increment
@param {Callback} clbk - callback
@param {*} [thisArg] - execution context
@returns {number} minimum value

@example
var x = [ -2.0, 1.0, 3.0, -5.0, 4.0, 0.0, -1.0, -3.0 ];

function accessor( v ) {
    return v * 2.0;
}

var v = minBy( x.length, x, 1, accessor );
// returns -10.0