DiscretePlot3D

DiscretePlot3D[f,{i,imin,imax},{j,jmin,jmax}] generates a plot of f when i runs from imin to imax and j runs from jmin to jmax.

DiscretePlot3D[f,{i,imin,imax,di},{j,jmin,jmax,dj}] uses steps di and dj.

DiscretePlot3D[f,{i,{i1,…,im}},{j,{j1,…,jn}}] uses successive i values i1, …, jm and j values j1, …, jn. 

DiscretePlot3D[{f1,f2,…},…,…] plots the values of all the fk.

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