As I see it this research is very important. Maybe we should get John
Gustafson into the forums and help him push it? While extending J ? /Erling
On 2016-08-22 11:04, Erling Hellenäs wrote:
This is how JWithATwist handles the same situation:
{ |<. 0.5 + 10 ^ 14 }
100000000000000
{ |<. 0.5 + 10 ^ 15 }
1000000000000000
{ |<. 0.5 + 10 ^ 16 }
Domain error
{ |>. 0.5 + 10 ^ 14 }
100000000000001
{ |>. 0.5 + 10 ^ 15 }
1000000000000001
{ |>. 0.5 + 10 ^ 16 }
Domain error
No ones invented. No data loss. Domain error if you use Floor or
Ceiling on a double when precision is higher than 1.
/Erling
On 2016-08-22 10:16, Erling Hellenäs wrote:
0j3 ": 0.5+10^14
100000000000000.500
The strange result under discussion. How does J create this result?
0j3 ": <. 0.5+10^14
100000000000001.000
I must admit I don't understand why this happens. It is loss of
precision?
0j3 ": 0.5+10^15
1000000000000000.500
Here we have loss of precision:
0j3 ": 0.5+10^16
10000000000000000.000
/Erling
On 2016-08-20 19:38, Raul Miller wrote:
If loss of precision is a problem, you should be using extended
precision
numbers (or rationals) for your values.
And, of course, you should be careful to use operations whose
results are
extended precision numbers (or rationals) for the values you are
working
with.
For example:
<.1r2+10^13x
10000000000000
Thanks,
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