Top
Back: Tricks and pitfalls
Forward: System dependent limitations
FastBack:
FastForward:
Up: Tricks and pitfalls
Top: Singular Manual
Contents: Table of Contents
Index: Index
About: About this document

6.1 Limitations

has the following limitations:

  • the characteristic of a prime field must be less than or equal to 2147483647 (2^31)
    (the characteristic of a prime field in the factory routines must be less than 536870912 (2^29))
    (the characteristic of a prime field in the NTL routines must be less than NTL_SP_BOUND (2^30) on 32bit machines - This is always the case since currently, only factory uses NTL.)
  • the number of elements in GF(p,n) must be less than 65536
  • the (weighted) degree of a monomial must be less or equal than 2147483647
  • the rank of any free module must be less or equal than 2147483647
  • the maximal allowed exponent of a ring variable depends on the ordering of the ring and is at least 32767. See also Monomial orderings for setting other limits.
  • the precision of long floating point numbers (for ground field real) must be less or equal than 32767
  • integers (of type int) have the limited range from -2147483648 to 2147483647
  • floating point numbers (type number from field real) have a limited range which is machine dependent. A typical range is -1.0e-38 to 1.0e+38. The string representation of overflow and underflow is machine dependent, as well. For example "Inf" on Linux, or "+.+00e+00" on HPUX.
    Their input syntax is given by scanf, but must start with a digit.
  • floating point numbers (type number from field real with a precision p larger then 3) use internally mpf_set_default_prec(3.5*p+1).
    Their input syntax is given by mpf_set_str from GMP, but must start with a digit.
  • the length of an identifier is unlimited but listvar displays only the first 20 characters
  • statements may not contain more than 10000 tokens
  • tokens (i.e. strings, numbers, ...) may not be longer than 16382 characters
  • All input to must be 7-bit clean, i.e. special characters like the the German Umlaute (ä, ö, etc.), or the French accent characters may neither appear as input to , nor in libraries or procedure definitions.
  • vspace, used in system("verifyGB",I) and farey can not use more than MAX_PROCESS (64) cpus. This limit can be changed in the source file kernel/oswrapper/vspace.h.


Top Back: Tricks and pitfalls Forward: System dependent limitations FastBack: FastForward: Up: Tricks and pitfalls Top: Singular Manual Contents: Table of Contents Index: Index About: About this document
            User manual for Singular version 4.3.1, 2022, generated by texi2html.