Singular

4.7.2 intvec expressions

An intvec expression is:

1. a range: int expression .. int expression
2. a repeated entry: int expression : positive int expression
   (a:b generates an intvec of length b>0 with identical entries a)
3. a function returning intvec
4. an expression involving intvec operations with int (+, -, *, /, %)
5. an expression of intvecs involving intvec operations (+, -)
6. an expression involving an intvec operation with intmat (*)
7. a type cast to intvec

Example:

  intvec v=-1,2;
  intvec w=v,v;         // concatenation
  w;
==> -1,2,-1,2
  w=2:3;                // repetition
  w;
==> 2,2,2
  int k = 3;
  v = 7:k;
  v;
==> 7,7,7
  v=-1,2;
  w=-2..2,v,1;
  w;
==> -2,-1,0,1,2,-1,2,1
  intmat m[3][2] = 0,1,2,-2,3,1;
  m*v;
==> 2,-6,-1
  typeof(_);
==> intvec
  v = intvec(m);
  v;
==> 0,1,2,-2,3,1
  ring r;
  poly f = x2z + 2xy-z;
  f;
==> x2z+2xy-z
  v = leadexp(f);
  v;
==> 2,0,1