get2DSeries(xLen, yLen, minValue, maxValue)

Gets an array of random numbers representing points on a 2D grid in which the difference between neighbouring points is random.

Argument	Default	Description
xLen	(Mandatory)	The number of points in the grid in the x direction.
yLen	(Mandatory)	The number of points in the grid in the y direction.
minValue	(Mandatory)	The minimum value of the random number.
maxValue	(Mandatory)	The maximum value of the random number.

An array of random numbers representing points on a 2D grid in which the difference between neighbouring points is random. The array will contain (xLen * yLen) elements. The element at index (y * xLen + x) represents the point at (x, y), in which x and y are integers such that 0 <= x < xLen and 0 <= y < yLen.