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Asked: 2026-06-14T23:41:00+00:00

It is clear. I had following error. How can I remove it. I need

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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.

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1 Answer

  1. Editorial Team

    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.

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