Determine if x is the specified numeric
type. (Examples for any integer, unsigned 64-bit integer, any floating
point, double precision, and single precision are shown here).
isreal(x)
Determine if x is real or complex.
isnan(x)
Determine if x is Not a Number (NaN).
isinf(x)
Determine if x is infinite.
isfinite(x)
Determine if x is finite.
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