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| From: | José Abílio Matos |
| Subject: | Re: Is double precision for floating point calculation the default? |
| Date: | Sat, 21 Mar 2020 12:54:14 +0000 |
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On Saturday, 21 March 2020 12.33.24 WET ttonon wrote: > >> pi > > ans = 3.1415926535897932?
See the help for format.
>> pi ans = 3.1416 >> format long >> pi ans = 3.141592653589793
> Also a figure like 2.2204e-16 is accurate only to 2.e-16. Correct? (Just > want to be sure.)
Nope. The value that you mention is the separation between the value represented and the next value represented by floating point representation.
>> eps 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).
> Tom
-- José Matos |
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