HI, all,
I found a weird problem:
When I used the subsop separately, it work fine. But when it was put in a procedure, then it cannot work. So weird!
For example:
>L:=[x,y,z,d];
L:=[x,y,z,d]
>L:=subsop(1=NULL,L);
L:=[y,z,d]
>L:=subsop(1=NULL,L);
L:=[z,d]
>L:=subsop(1=NULL,L);
L:=[d]
However, when I put the subsop in a procedure, it cannot work:
>F:=proc(L)
>L:=subsop(1=NULL,L);
>end proc;
>L:=[x,y,z,d];
L:=[x,y,z,d]
>F(L);
Error, (in F)illegal use of a formal parameter
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Many thanks.
