It means that there is nothing stored in loop_value[37], that's all.
Test this out on your list by calling IsBound(loop_value[37]).
If you want to see what is happening just before you get the error, just
after the "while" add "i<>37 or"
It should stop there and you can see what GAP is using for loop_value.
Joe
Neha Gupta wrote:
Dear GAP Members,
I have written the following code using while loop :
while loop_value[i]<>loop_value[i-1] do
loop_elems:=optimal(181);;
loop_value[i]:=value;;
First_elems:=loop_elems;;
First_value:=loop_value[i];;
i:=i+1;;
od;
Here, 'loop_value' and 'loop_elems' are a list. The while loop is supposed
to run until any two consecutive places in list have the same value. The
function 'optimal' returns a list. We assign this list to the list
'loop_elems'. There is also a global variable 'value' which is used in the
the function 'optimal'. We assign this variable to 'loop_value[i]'.
But the program generates the following error at the run time :
*List Element: <list>[37] must have an assigned value at
while loop_value[i] <> loop_value[i - 1] do
loop_elems := optimal( 181 );
;
loop_value[i] := value;
;
First_elems := loop_elems;
;
First_value := loop_value[i];
;
i := i + 1;
;
od;
called from
<function>( <arguments> ) called from read-eval-loop
*Does the error mean that the list 'loop_value[]' can not have more than 36
places as a list ???
Please help as I do not understand this run time error.
Thanks
Best
Neha Gupta
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