|From:||José Abílio Matos|
|Subject:||Re: Is double precision for floating point calculation the default?|
|Date:||Sat, 21 Mar 2020 12:54:14 +0000|
On Saturday, 21 March 2020 12.33.24 WET ttonon wrote:
> >> pi
> ans = 3.1415926535897932?
See the help for format.
ans = 3.1416
>> format long
ans = 3.141592653589793
> Also a figure like 2.2204e-16 is accurate only to 2.e-16. Correct? (Just
> want to be sure.)
The value that you mention is the separation between the value represented and the next value represented by floating point representation.
ans = 2.220446049250313e-16
All those digits are significant. Simplifying we can say basically that we have ~16 digits for each floating point number (that is a simplified but mostly accurate picture).
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