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pl:prolog:pllib:normalization [2019/06/27 15:50] (aktualna) |
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| + | ====== Normalization ====== | ||
| + | {{tag>math}} | ||
| + | ===== Description ===== | ||
| + | Normalizing plus expressions. | ||
| + | |||
| + | **Source**: The Art of Prolog | ||
| + | ===== Download ===== | ||
| + | Program source code: {{normalization.pl}} | ||
| + | ===== Listing ===== | ||
| + | <code prolog> | ||
| + | /* | ||
| + | normalize(Sum,NormalisedSum) :- | ||
| + | NormalizedSum is the result of normalizing the sum expression Sum. | ||
| + | |||
| + | */ | ||
| + | :- op(50,xfx,++). | ||
| + | |||
| + | normalize(Exp,Norm) :- normalize_ds(Exp,Norm++0). | ||
| + | |||
| + | normalize_ds(A+B,Norm++Space) :- | ||
| + | normalize_ds(A,Norm++NormB), normalize_ds(B,NormB++Space). | ||
| + | normalize_ds(A,(A+Space)++Space) :- | ||
| + | constant(A). | ||
| + | |||
| + | % Program 15.7 : Normalizing plus expressions. | ||
| + | </code> | ||
| + | ===== Comments ===== | ||
