string which is valid to constitute an indeterminate.
Convert a string that is valid for an indeterminate into an indeterminate
which have str as its print name.
The valid string for an indeterminate is such a string that begins
with a small alphabetical letter possibly followed by any string composed
of alphabetical letters, digits or a symbol `_'.
Use the command to create indeterminates dynamically in programs.
[0] A="afo";
afo
[1] for (I=0;I<3;I++) {B=strtov(A+rtostr(I)); print([B,type(B)]);}
[afo0,2]
[afo1,2]
[afo2,2]