[Cs254f11] Basic vector question
Omri Bernstein
ob08 at hampshire.edu
Sun Oct 9 19:56:55 EDT 2011
I think I get your meaning, you have a vector with a vector nested in
it--like [1 2 [1 5] 3 4]--right? If you want to get a value within a vector
within a vector you can use the function "get-in". For example:
(def example-vec
[1 2 [1 5] 3 4])
(get-in example-vec [2 0])
>> 1
(get-in example-vec [2 1])
>> 5
The "get-in" function takes a collection and then a vector of what it should
use on (what is equivalent to) recursive calls to "get". So the first
example above is the same thing as doing (get 0 (get 2 example-vec)). If you
had a nested vector within your nested vector, you could access those values
directly by doing something like this:
(def example-vec2
[1 2 [1 [10 12] 5] 3 4])
(get-in example-vec [2 1 0])
>> 10
(get-in example-vec [2 1 1])
>> 12
Hope it helps.
-Omri
On Sun, Oct 9, 2011 at 6:41 PM, James Matheson <jmatheson12 at gmail.com>wrote:
> This is a little basic but how do you access an element within a
> vector? I know (nth x) or (get x) will return the value at that index,
> but if I'm trying to get something where the value is [1, 5] how do I
> access 1 or 5 directly?
>
> Thanks in advance,
> Jamie
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