CODEWITHSUNDEEP
smlsmlnj
700resu
700resu

Reputation: 259

How can I remove subscript out of bound error

It is clear. I had following error. How can I remove it. I need to process all of the list.

uncaught exception Subscript [subscript out of bounds]
 raised at: Basis/Implementation/list.sml:...

It's in SML/NJ and I am working with lists.

Thank You.

Upvotes: 1

Views: 3692

Answers (1)

Sebastian Paaske Tørholm
Sebastian Paaske Tørholm

Reputation: 50858

The error means you're trying to access an element with an index that isn't in the list.

For instance:

- List.nth([0,1,2], 7);

uncaught exception Subscript [subscript out of bounds]
  raised at: Basis/Implementation/list.sml:47.35-47.44

You solve this problem by not trying to access nonexistent elements. You should generally be careful with dealing with functions like List.nth, List.take, List.drop, ..., as they're partial functions, which only work for certain inputs.

Upvotes: 5

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