Timeline for Behavior of "integer complex number" on computer [closed]
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
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| Jan 6, 2016 at 8:09 | history | closed |
Will Jagy José Figueroa-O'Farrill Lucia Alexey Ustinov Wolfgang |
Needs details or clarity | |
| Jan 6, 2016 at 7:24 | comment | added | eric | exp(2+3i) is a complex number in all the existing software I've used; a complex number is a pair of reals; a real number is the usual PITA if you want more accuracy than double/long etc. If you're writing a new software library then it might be a good idea to spend some time playing with existing libraries to see what they do? | |
| Jan 5, 2016 at 23:46 | review | Close votes | |||
| Jan 6, 2016 at 8:09 | |||||
| Jan 5, 2016 at 23:41 | comment | added | user26415 |
@eric - I am not looking for software to use: I am writing a new software library to compute with those numbers. That library with have +, -, *, /, but also transcendentals. "take you into" would mean that the type coming out of some functions would depend on the arguments of the functions, which could be problematic. Hence my question: if the user uses my library to calculate exp(2+3i), for example, what would be reasonable to return? Or what do other existing software, like pari, ... do?
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| Jan 5, 2016 at 23:26 | comment | added | user26415 | OK - I'll retire my question... or maybe not. Mark is getting me the kind of answer I was looking for. | |
| Jan 5, 2016 at 23:25 | review | First posts | |||
| Jan 5, 2016 at 23:41 | |||||
| Jan 5, 2016 at 23:25 | answer | added | Mark Fischler | timeline score: 1 | |
| Jan 5, 2016 at 23:21 | comment | added | eric | This question is unanswerable in my mind unless you are far more precise about what you mean by "some operations". Magma, sage, pari etc all implement number fields and there Z[i] is implemented exactly; some operations take you into Q(i) which is also implemented exactly; others, like transcendental operations, take you into the complexes so then you just round. This is not really a site for computer software either; try stackoverflow? But people won't know what software to suggest until they know more precisely what you want to do. | |
| Jan 5, 2016 at 23:14 | history | asked | user26415 | CC BY-SA 3.0 |