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symbol v/: - how many values?


Given a function v of the form

     v[x1_, x2_, ..] := v[x1, x2, ..] = ......

which therefore saves the values computed for given x1, x2, and associates
them with v, the actual saves values can be inspected with ?v or 

How can I find out how many values of v have been calculated, without
asking to see them in some form and then counting them automatically.

The reason I ask is that, the values are being calculated recursively
by a dynamic program, and I would like to see how efficiently search
space is being traversed.

Thanks for any clues.

Jason Harrop
jasonh at

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