Singular Manual: varstr

  | ### 5.1.167 varstr `Syntax:` `varstr (` ring_name `)` `varstr (` int_expression `)` `varstr (` ring_name`,` int_expression `)` `Type:` string `Purpose:` returns the list of the names of the ring variables as a string or the name of the n-th ring variable, where n is given by the int_expression. If the ring name is omitted, the basering is used, thus `varstr(n)` is equivalent to `varstr(basering,n)`. `Example:`
        ring r=0,(x,y,z),dp;
        varstr(r);
      ==> x,y,z
        varstr(r,1);
      ==> x
        varstr(2);
      ==> y
See charstr; int; nvars; ordstr; parstr; ring; var.

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