Numerical calculation Mathematica 11.2 / 11.3 / 12

Asked May 21 '19 at 16:48

Active May 21 '19 at 16:48

Viewed 88 times

Please

I do not understand why Mathematica 11.2 version evaluates numerically the value below

Exp[-800]//N
(* 3.667874584178*10^-348 *)

while 11.3 and 12 displays the error message

Exp[-800]//N
(* General::munfl: Exp[-800.] is too small to represent as a normalized machine number; 
 precision may be lost. *)

Could someone explain that please? Thanks

asked May 21 '19 at 16:48

Betatron

2

Possible duplicate: https://mathematica.stackexchange.com/questions/170416/new-generalmunfl-error-and-loss-of-precision -- See also this site search; this answer may also be of interest – Michael E2 May 21 '19 at 16:52
Use arbitrary precision – ktm May 21 '19 at 16:59
Is there a general schemes/option to fix this problem? – Betatron May 21 '19 at 17:47
N[Exp[-800], 20] Works for me in MMA 12. – Mariusz Iwaniuk May 21 '19 at 18:18
1

See the "this answer" link in my first comment. – Michael E2 May 21 '19 at 18:20

0 Answers0