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pl:prolog:pllib:variance [2019/06/27 15:50] (aktualna) |
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| + | ====== Variance ====== | ||
| + | {{tag>math}} | ||
| + | ===== Description ===== | ||
| + | Counting observation variance from list elements | ||
| + | |||
| + | **Source**: PROLOG str. 198 Wydawnictwo PLJ Warszawa 1991 ISBN 83-85190-63-5 | ||
| + | ===== Download ===== | ||
| + | Program source code: {{variance.pl}} | ||
| + | ===== Listing ===== | ||
| + | <code prolog> | ||
| + | wari(L, W) :- sred(L, Sr), rozn2(L, H, Sr), suma(H, Suma, 0, Ilosc, 0), | ||
| + | W is Suma/Ilosc. | ||
| + | rozn2([], [], _). | ||
| + | rozn2([H|T], [R|T1], Sr) :- R is (H - Sr)*(H - Sr), rozn2(T, T1, Sr). | ||
| + | |||
| + | test :- wari([1, 2, 3, 4, 5]).</code> | ||
| + | ===== Comments ===== | ||
