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NHoldAll

  • NHoldAll is an attribute which specifies that none of the arguments to a function should be affected by N.
  • NHoldAll, NHoldFirst and NHoldRest are useful in ensuring that arguments to functions are maintained as exact integers, rather than being converted by N to approximate numbers.
  • See the Mathematica book: Section 2.5.3.
  • See also: NumericFunction, HoldAll.

    Further Examples

    Usually N goes inside functions and gets applied to each of their arguments.

    In[1]:=

    Out[1]=

    This tells Mathematica not to apply N to any of the arguments of f.

    In[2]:=

    Now both of the arguments of f are left in their exact form.

    In[3]:=

    Out[3]=