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Re: Lists and Vectors
From: |
David Kastrup |
Subject: |
Re: Lists and Vectors |
Date: |
Fri, 09 Oct 2009 12:44:20 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.1.50 (gnu/linux) |
Nordlöw <per.nordlow@gmail.com> writes:
> If I have an association list say,
>
> '(
> ("key" sym1 val1 num1)
> ("key2" sym2 val2 num2)
> )
>
> , where each entry is a fixed sequence of various objects. I might
> aswell use a vector to represent an entry in this alist, right?
>
> In this case, what do I gain by using a vector instead of list?
conses.
> What about performance?: aref() faster than nth() only for large
> vectors?
Mostly.
> Is there vector-variant of assoc()? If not, why? Has any one already
> written such a function?
You would only put sym, val, num into the vector. If your association
list is long enough that key lookup would become slow, you'd rather use
a hashtable.
--
David Kastrup