Hi there,
I have a program that produces multidimensional LazySeqs, i.e. seqs of seqs
of seqs of...
I would like to write a function to convert these multidimensional LazySeqs
to vectors. This is in case a user needs constant lookup time.
The following function will do it:
(defn vectorize [obj]
(if-not (seq? obj)
obj
(vec (map vectorize obj))))
(def foo (list 1 2 3 (list 1 2 4 (list 1 4)) 2))
(vectorize foo)
>> [1 2 3 [1 2 4 [1 4]] 2]
However, since there is no recur there, the function is liable to blow the
stack on a very deep data structure (or so I gather from reading about
Clojure's lack of TCO).
I cannot figure out how to write the function using recur. Any ideas?
More broadly, this would not be necessary if I could tell my LazySeqs to
cache accesses and they cached them using a constant-lookup-time data
structure. I've seen mention that LazySeqs cache access, but they don't seem
to for me:
user=> (def foo (lazy-seq (range 10000000)))
user=> (time (nth foo 9999999))
"Elapsed time: 655.924286 msecs"
9999999
user=> (time (nth foo 9999999))
"Elapsed time: 675.42013 msecs"
9999999
Maybe I'm misunderstanding what is meant by caching.
Any thoughts on the vectorize function or caching?
Thanks.
Garth
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