isANumber x
For a discussion of the notion of not-a-number in floating point arithmetic, see http://en.wikipedia.org/wiki/NaN.
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The object isANumber is a compiled function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Macaulay2Doc/ov_analytic_functions.m2:513:0.