Power set: Difference between revisions
Content deleted Content added
→{{header|REXX}}: added the REXX language. -- ~~~~ |
m →{{header|REXX}}: changed the "set" variable name to '''S'''. -- ~~~~ |
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=={{header|REXX}}== |
=={{header|REXX}}== |
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<lang rexx>/*REXX program to display a power set, items may be anything (no blanks)*/ |
<lang rexx>/*REXX program to display a power set, items may be anything (no blanks)*/ |
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parse arg |
parse arg S /*let user specify the set. */ |
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if |
if S='' then S='one two three four' /*None specified? Use default*/ |
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N=words( |
N=words(S) /*number of items in the list.*/ |
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ps='{}' /*start with a null power set.*/ |
ps='{}' /*start with a null power set.*/ |
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do chunk=1 for N /*traipse through the items. */ |
do chunk=1 for N /*traipse through the items. */ |
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exit /*stick a fork in it, we done.*/ |
exit /*stick a fork in it, we done.*/ |
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/*─────────────────────────────────────$COMBN subroutine────────────────*/ |
/*─────────────────────────────────────$COMBN subroutine────────────────*/ |
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combN: procedure expose $ |
combN: procedure expose $ S; parse arg x,y; $= |
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!.=0; base=x+1; bbase=base-y; ym=y-1; do p=1 for y; !.p=p; end |
!.=0; base=x+1; bbase=base-y; ym=y-1; do p=1 for y; !.p=p; end |
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do j=1; L= |
do j=1; L= |
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do d=1 for y; _=!.d; L=L','word( |
do d=1 for y; _=!.d; L=L','word(S,_); end |
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$=$ '{'strip(L,'L',",")'}' |
$=$ '{'strip(L,'L',",")'}' |
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!.y=!.y+1; if !.y==base then if .combU(ym) then leave |
!.y=!.y+1; if !.y==base then if .combU(ym) then leave |
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