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is_nan |
Function (ROM Call 0x306) |
Checks whether the argument is Not_a_Number.
is_nan returns TRUE if x is NAN
(Not_a_Number), else returns FALSE. Not_a_Number is a special
value which is produced as a result of all operations when the result is undefined
or non-real, for example dividing zero with zero, calculating the logarithm of
a negative number, etc.
Uses: _bcd_math
Used by: cacos, casin, cln, cosh, float_class, fmod, is_transfinite, itrig, sinh, tanh, did_push_anti_deriv, push_1st_derivative, push_abs, push_csolve, push_czeros, push_def_int, push_desolve, push_lim, push_max, push_min, push_nsolve, push_solve, push_zeros, did_push_to_polar, push_equals, push_exponentiate, push_greater_than, push_greater_than_or_equals, push_less_than, push_less_than_or_equals, push_not_equals, push_to_cylin, push_Float, did_push_approx_inflection_point, get_ub, GM_Intersect, GM_Math1, GT_Trace, Regraph, replace_top_with_post_simplified