Description Objects from the Class Slots Methods
The virtual class gArray is used to stadarize the storage and  access of array-like experiment arrangement.It represent the  arrangement of the experiment units, such as slide ans plate.
A virtual Class: No objects may be created from it.
nRows:Object of class "integer". Number of
units per row. 
nColumns:Object of class "integer". Number of
units per column. 
layout:Object of class "data.frame". A data
frame represent the layout and order of postiion. 
byrow:Object of class "logical". The order of
position is filled by row or not. Default is FALSE, same as
used in mactrix().  
metadata:Object of class "list". A list that
holds brief description of the class and other information. 
In the following code snippets, x is an gArray object.
signature(x = "gArray"): Return the dimmension of
the array. 
signature(x = "gArray"): Return a data frame
represent the layout postions of the array.
signature(x = "gArray"): Set the metadata. 
signature(x = "gArray"): Get the metadata. 
signature(x = "gArray"): Return the number of columns.
signature(x = "gArray"): Return the number of rows. 
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