Long integers in Singular
E-mail to Singular-Team · Thu Sep 22, 2005 6:05 pm
Hi.
Is there any way to define and use long integer numbers? Say 30 digits?
Is there any way to define and use long integer numbers? Say 30 digits?
Long integers in Singular
lossen · Thu Sep 22, 2005 6:12 pm
Long integers are available as coefficients of polynomials. Define a ring:
Then all objects of type number are arbitrary long integers resp. rationals:
For some applications also the use of "long floats" as polynomial coefficients could be appropriate:
Hope that answers your question.
Christoph Lossen
(Singular Team)
Code:
> ring r=0,x,dp;
Then all objects of type number are arbitrary long integers resp. rationals:
Code:
> number n=12345678901234567890;
> number m=n^100;
> size(m); // number of digits of m
204
> number m=n^100;
> size(m); // number of digits of m
204
For some applications also the use of "long floats" as polynomial coefficients could be appropriate:
Code:
> ring rr=(real,30),x,dp; // float with 30 digits
> rr;
// characteristic : 0 (real:30 digits, additional 30 digits)
// number of vars : 1
// block 1 : ordering dp
// : names x
// block 2 : ordering C
> number n=12345678901234567890;
> n^100;
0.141741727427773144141199473044e+1910
> rr;
// characteristic : 0 (real:30 digits, additional 30 digits)
// number of vars : 1
// block 1 : ordering dp
// : names x
// block 2 : ordering C
> number n=12345678901234567890;
> n^100;
0.141741727427773144141199473044e+1910
Hope that answers your question.
Christoph Lossen
(Singular Team)