6.7.1 Transform a floating point number into a rational: exact float2rational
Rational numbers can be approximated by floating point numbers, but
since floating point numbers are not exact, they can’t typically be
converted back to the original rational number. However, the
float2rational command will try convert a
floating point to a nearby rational number.
exact is a synonym for float2rational.
-
float2rational takes one argument:
d, a floating point number.
- float2rational(d) returns
a rational number q close to d; namely such that
|d−q|<epsilon, where epsilon is defined in the
cas configuration (Cfg menu, see
Section 3.5.7, item 9) or with the
cas_setup command (see Section 3.5.10).
Examples.