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NValues

NValues[symbol]

gives the list of numerical values associated with symbol.

Note: this function is in Mathematica 5 but has been removed from current Mathematica.

• • NValues[a]

• • N[a] = 3;

• • NValues[a]

You can assign values to NValues:

• • NValues[b] := {N[b, MachinePrecision] :> 2}

• • N[b]

Be sure to use SetDelayed, otherwise the left-hand side of the transformation rule will be evaluated immediately, causing the head of N to get lost. Furthermore, you have to include the precision in the rules; MachinePrecision will not be inserted automatically:

• • NValues[c] := {N[c] :> 3}

• • N[c]

Mathics will assign any list of rules to NValues; however, inappropriate rules will never be used:

• • NValues[d] = {foo -> bar};

• • NValues[d]

• • N[d]