>If someone who knows what they are talking about [...] to give a precise answer to the question on https://ask.sagemath.org/ <https://www.google.com/url?q=https%3A%2F%2Fask.sagemath.org%2Fquestion%2F36480%2Frestricted-usability-of-singular-after-upgrade%2F&sa=D&sntz=1&usg=AFQjCNECM1JU19STgvgsg5LMJc8WX3bGng> question/36480/restricted-usability-of-singular-after-upgrade/ <https://ask.sagemath.org/question/36480/restricted-usability-of-singular-after-upgrade/> it would be helpful to examine the failing example.
First guess: because there _could be an overflow_ for some operation if an exponent in the input is bigger than 16 bit, in recent Singular the input exponent is restricted to 16 bit. No explicit overflow test is implemented. For example, if you try in recent Singular ring rng = 0,(x,y),dp; short = 0; poly h = x^2147483647; // ? OVERFLOW in power(d=1, e=2147483647, max=32767) you get an overflow exception with the hint that max allowed exponent is 32767. This was not the case for older Singular versions. My second guess is: an overflow occurs in the computation by Singular which was not detected in older Singular version => result seems computable but is likely incorrect. In the new Singular version and thus in Sage with upgraded Singular the overflow is detected correctly so the computation is aborted. Am Mittwoch, 8. Februar 2017 20:32:43 UTC+1 schrieb kcrisman: > > > > > as far as I know, limiting to 16 bit exponents for _input_ was introduced >> to prevent undetected overflows; >> it must be one of the tickets >>> >>> >>> > > If someone who knows what they are talking about (i.e., not me) could > mention this on the ask.sagemath question that would be really helpful. > https://ask.sagemath.org/ > <https://www.google.com/url?q=https%3A%2F%2Fask.sagemath.org%2Fquestion%2F36480%2Frestricted-usability-of-singular-after-upgrade%2F&sa=D&sntz=1&usg=AFQjCNECM1JU19STgvgsg5LMJc8WX3bGng> > question/36480/restricted-usability-of-singular-after-upgrade/ > <https://ask.sagemath.org/question/36480/restricted-usability-of-singular-after-upgrade/> > Seems to be an otherwise-satisfied customer who is at a loss. > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
