Please help! Matrices and parameter of time

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Hi, Well, the solution to my problem maybe is easy, but i have really
stuck with this.
I have a process which evolves in three times, so there is the
parameter of time (t=1,2,3).More particularly i have three 4*4 
matrices, one for each time. In other words each element has three
cordinates: time, row and column.
The problems are these:i don't know how to express these matrices.Also
i don't know how can i extract each element, for example, if i want the
element from the matrix corresponding to the 3d time, the  2nd row, the
3d column, how will i extract this? 
I would appreciate any help and idea!Thank you!Anna S.
		 	   		  
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