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4.21.3 string type cast
Syntax:
string ( expression [, expression_2, ... expression_n])
Type:
- string
Purpose:
- Converts each expression to a string, where expression can be of any
type. The concatenated string of all converted expressions is returned.
The elements of intvec, intmat, ideal, module, matrix, and list, are
separated by a comma. No newlines are inserted.
Not defined elements of a list are omitted.
For link, the name of the link is used.
For map, the ideal defining the mapping is converted.
Note:
- When applied to a list, elements of type intvec, intmat, ideal, module,
matrix, and list become indistinguishable.
Example:
| string("1+1=", 2);
==> 1+1=2
string(intvec(1,2,3,4));
==> 1,2,3,4
string(intmat(intvec(1,2,3,4), 2, 2));
==> 1,2,3,4
ring r;
string(r);
==> (ZZ/32003),(x,y,z),(dp(3),C)
string(ideal(x,y));
==> x,y
qring R = std(ideal(x,y));
string(R);
==> (ZZ/32003),(x,y,z),(dp(3),C)
map phi = r, ideal(x,z);
string(phi);
==> x,z
list l;
string(l);
==>
l[3] = 1;
string(l); // notice that l[1],l[2] are omitted
==> 1
l[2] = l;
l;
==> [2]:
==> [3]:
==> 1
==> [3]:
==> 1
string(l); // notice that lists of list is flattened
==> 1,1
l[1] = intvec(1,2,3);
l;
==> [1]:
==> 1,2,3
==> [2]:
==> [3]:
==> 1
==> [3]:
==> 1
string(l); // notice that intvec elements are not distinguishable
==> 1,2,3,1,1
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See
Type conversion and casting;
print;
string.
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