New answers tagged assignment
1
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I can not reproduce your result. When I execute your code I get the result that I expected which is:
I did m y evaluation in V12.1.1 on MacOS 10.13.4.
Writing f[x_] := x = x + 1 doesn't really make much sense. The assignment will always fail, but x + 1 will be ...
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Number of lines in definition: Length@DownValues@f, as suggested by b3m2a1
Number of values stored: remove expressions containing the head Pattern from DownValues. I don't know if there's a better way than this. Note that the duplicates do not cause any trouble.
f[0] = 1;
f[n_] := f[n] = 2 f[n - 1];
f[m_, n_] := f[m + n];
f[1000];
Position[DownValues@f, ...
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