Hi all,
I 'm a bit confused with this - I'm trying to think but I can't!!!
Probably cos I've not had any food yet!
Up till now I thought I could construct matrices with 'for'...So (for [i
(range 3)] i) gives us a 1d structure (a list)...
(for [i (range 3) j (range 4)] [i j]) gives us a 2d structure (list of
vectors)
On that basis I wrote the following little macro thinking I'd be bale to
create matrices with arbitrary dimensions:
(defn matrix [& dim-lengths]
(let [bindings (vec (mapcat #(vector (gensym) `(range ~%)) dim-lengths))
symbols (mapv first (partition 2 bindings))
counts (count symbols)]
`(for ~bindings (if (< counts 1) ~symbols (first ~symbols)))))
Now, even though this expands to the 'for' I want I'm starting to think
this is not the right approach for matrices...all I get is 2d structures
regardless of how many dimensions I pass in...
any ideas anyone?
Jim
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