I would like to find the entries with 4 adjacent cells (horizontally or
vertically) ?
Is this the right way to do this ? I don't think so, since my solution
seems to be very slow. Evaluating in LightTable takes about 10 seconds.
(def matrix [
{:row 1
:col 1}
{:row 1
:col 2}
{:row 1
:col 3}
{:row 1
:col 4}
{:row 2
:col 1}
{:row 3
:col 1}
{:row 4
:col 1}
{:row 3
:col 2}
])
(defn succo [row col row-offset col-offset]
(fresh [?pm ?row ?col]
(membero ?pm matrix)
(featurec ?pm {:row ?row :col ?col})
(fd/eq (= ?col (+ col col-offset)))
(fd/eq (= ?row (+ row row-offset)))))
(run* [q]
(fresh [?pm ?row ?col]
(featurec ?pm {:row ?row :col ?col})
(conde
[(succo ?row ?col 0 1)(succo ?row ?col 0 2)(succo ?row ?col 0
3)]
[(succo ?row ?col 1 0)(succo ?row ?col 2 0)(succo ?row ?col 3
0)])
(== q [?pm])
(membero ?pm matrix)))
Regards
Roger
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