[GAP Forum] Lists in GAP

[Neha Gupta]

Dear Forum Member,

I want to use arrays in GAP. But Im not able to find a way of
declaring/defining one.  The following is what I intend to do...

I have defined elems1 as a List with 36 members. A tyical element of elems1
looks like this :
        Tuple([ C2[1],Random(M)])

Now I wish to define another List elems2 also with 36 members using elems1 :

b:=Random([1..16]);;
x:=elems1[b][2];;
pik:=Random(M);;

for j in  [1..36]  do
    if (j<> b) then
        elems2[j]:=elems1[j];;
    else
        elems2[j]:=Tuple([elems1[j][1],pik]);;
     fi;
od;

I get the following error :

" Error, The list you are trying to assign to is immutable called from
j <> b called from
<function>( <arguments> ) called from read-eval-loop "

Please help me defining a List/Array.

Neha