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Add an unzip word

db4
Slava Pestov 2008-07-20 01:12:15 -05:00
parent 7577ffd5eb
commit 4c4c47de77
2 changed files with 4 additions and 1 deletions
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3
core/assocs/assocs.factor
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@ -158,6 +158,9 @@ M: assoc value-at* swap [ = nip ] curry assoc-find nip ;
: zip ( keys values -- alist )
2array flip ; inline
: unzip ( assoc -- keys values )
dup assoc-empty? [ drop { } { } ] [ >alist flip first2 ] if ;
: search-alist ( key alist -- pair i )
[ first = ] with find swap ; inline

2
extra/koszul/koszul.factor
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@ -184,7 +184,7 @@ DEFER: (d)
[ length ] keep [ (graded-ker/im-d) ] curry map ;
: graded-betti ( generators -- seq )
basis graded graded-ker/im-d flip first2 but-last 0 prefix v- ;
basis graded graded-ker/im-d unzip but-last 0 prefix v- ;
! Bi-graded for two-step complexes
: (bigraded-ker/im-d) ( u-deg z-deg bigraded-basis -- null/rank )