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How to calculate gradient and laplace of a list

• To: mathgroup at smc.vnet.net
• Subject: [mg72871] How to calculate gradient and laplace of a list
• From: "leoshen" <programrelated at gmail.com>
• Date: Tue, 23 Jan 2007 05:17:15 -0500 (EST)

Hi, guys
I have a matrix of n*m read from a file. mathematica has built in function 
to do discrete fourier transform of the list.
Can I calculate the gradient and the laplace of the matrix?
I can use the listcontourplot to plot the matrix, Is there any way to plot 
the gradient plot of it?