|
D.2.12.8 fetchall
Procedure from library ring.lib (see ring_lib).
- Usage:
- fetchall(R[,s]); R=ring/qring, s=string
- Create:
- fetch all objects of ring R (of type poly/ideal/vector/module/number/matrix)
into the basering.
If no 2nd argument is present, the names are the same as in R. If,
say, f is a polynomial in R and the 2nd argument is the string "R", then f
is mapped to f_R etc.
- Return:
- no return value
- Note:
- As fetch, this procedure maps the 1st, 2nd, ... variable of R to the
1st, 2nd, ... variable of the basering.
The 2nd argument is useful in order to avoid conflicts of names, the
empty string is allowed
- Caution:
- fetchall does not work for locally defined names.
It does not work if R contains a map.
Example:
| LIB "ring.lib";
// The example is not shown since fetchall does not work in a procedure;
// (and hence not in the example procedure). Try the following commands:
// ring R=0,(x,y,z),dp;
// ideal j=x,y2,z2;
// matrix M[2][3]=1,2,3,x,y,z;
// j; print(M);
// ring S=0,(a,b,c),ds;
// fetchall(R); //map from R to S: x->a, y->b, z->c;
// names(S);
// j; print(M);
// fetchall(S,"1"); //identity map of S: copy objects, change names
// names(S);
// kill R,S;
| See also:
imapall.
|