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3.1.9 Advanced Topic: Controlling Numerical Evaluation
Attributes for controlling numerical evaluation.
Usually N goes inside functions and gets applied to each of their arguments.
In[1]:= N[f[2/3, Pi]]
Out[1]= 
This tells Mathematica not to apply N to the first argument of f.
In[2]:= SetAttributes[f, NHoldFirst]
Now the first argument of f is left in its exact form.
In[3]:= N[f[2/3, Pi]]
Out[3]= 
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