Forcing a subscripted list always to be a list?

unknown

Here's a code snippet:

a={"A","B","C","D",123};

sub1 = list(1,3,5);

sub2 = list(1);

show(a[sub1]);

show(a[sub2]);

Output:

a[sub1] = {"A", "C", 123};

a[sub2] = "A";

Is there some way of subscripting a list with an arbitrary number of elements, and always have the output be a list?

Justin_Chilton

When your subscript only has one value, it is always going to return the single value. If your subscript is a list with multiple values, it is going to return all the values in the form of a list.

To get around this you need an If statement to check for how many values are in your subscript list and wrap the return if the subscript has only one value.

Here is an example I put together:

a = {"A", "B", "C", "D", 123};

sub1 = List( 1, 3, 5 );

sub2 = List( 1 );

Eval( Eval Expr( indicesList = {Expr( sub1 ), Expr( sub2 )} ) );

For( i = 1, i <= N Items( indicesList ), i++,

If( N Items( indicesList[i] ) > 1,

temp = a[indicesList[i]],

temp = Eval( Eval Expr( List( Expr( a[indicesList[i]] ) ) ) )

);

Show( temp );

);