On 29.10.2009, at 14:01, Rock wrote:
>>> Suppose we're dealing with rank n objects. Do you think it
>>> would be an easy task to figure all that out dealing with nested
>>> vectors?
>>
>> If you can assume the array is well-formed, it is rather easy.
>> Otherwise it isn't.
>
> Can you give an example in code? I really would like to see it.
(defn rank
[item]
(if (vector? item)
(inc (rank (nth item 0)))
0))
(rank 0)
(rank [1 2 3])
(rank [[1 2] [3 4]])
(defn shape
[item]
(if (vector? item)
(let [element (nth item 0)
n (count item)]
(cons n (shape element)))
(list)))
(shape 0)
(shape [1 2 3])
(shape [[1 2] [3 4]])
>>> And by the way, How would you go about implementing in detail
>>> a check to see if a nested vector is actually an authentic
>>> multidimensional array or not?
>>
>> That's a rather simple recursive function. The only problem is its
>> run-
>> time cost.
>
> Please provide an example. In the meantime, I'll give it a shot
> myself.
(defn check-multiarray
[item]
(and (vector? item)
(apply = (map shape item))))
; true
(check-multiarray [1 2 3])
(check-multiarray [[1 2] [3 4]])
; false
(check-multiarray 1)
(check-multiarray [[1 2] 3])
(check-multiarray [[1 2] [3]])
> I feel Clojure can and actually should become a language well-suited
> for scientific computation. It may not have all the prerequisites now,
> but, hey, this is Lisp, and it can be done, always! :)
I completely agree. I don't think Clojure will become a mainstream
language for science any time soon, for that it is too "exotic" for a
community that still sticks to Fortran. But it can find its niche, and
perhaps not even a small one.
Konrad.
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