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September Morn Update

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Ingy döt Net 2019-09-12 10:33:56 -07:00
parent 4e2d22a71d
commit aac6731f2c
6856 changed files with 141342 additions and 21127 deletions
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41
Task/Power-set/REXX/power-set.rexx
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@ -1,29 +1,34 @@
/*REXX program displays a power set; items may be anything (but can't have blanks).*/
parse arg S /*allow the user specify optional set. */
if S='' then S= 'one two three four' /*Not specified? Then use the default.*/
@='{}' /*start process with a null power set. */
N=words(S); do chunk=1 for N /*traipse through the items in the set.*/
@=@ combN(N, chunk) /*take N items, a CHUNK at a time. */
end /*chunk*/
w=length(2**N) /*the number of items in the power set.*/
do k=1 for words(@) /* [↓] show combinations, one per line*/
say right(k, w) word(@, k) /*display a single combination to term.*/
end /*k*/
@= '{}' /*start process with a null power set. */
N= words(S); do chunk=1 for N /*traipse through the items in the set.*/
@=@ combN(N, chunk) /*take N items, a CHUNK at a time. */
end /*chunk*/
w= length(2**N) /*the number of items in the power set.*/
do k=1 for words(@) /* [↓] show combinations, one per line*/
say right(k, w) word(@, k) /*display a single combination to term.*/
end /*k*/
exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
combN: procedure expose S; parse arg x,y; base=x+1; bbase=base-y; !.=0
do p=1 for y; !.p=p; end /*p*/
combN: procedure expose S; parse arg x,y; base= x + 1; bbase= base - y
!.= 0
do p=1 for y; !.p= p
end /*p*/
$=
do j=1; L=
do d=1 for y; L=L','word(S, !.d)
end /*d*/
$=$ '{'strip(L, "L", ',')"}"
!.y=!.y+1; if !.y==base then if .combU(y-1) then leave
do j=1; L=
do d=1 for y; L= L','word(S, !.d)
end /*d*/
$=$ '{'strip(L, "L", ',')"}"; !.y= !.y + 1
if !.y==base then if .combU(y - 1) then leave
end /*j*/
return strip($) /*return with a partial powerset chunk.*/
/*──────────────────────────────────────────────────────────────────────────────────────*/
.combU: procedure expose !. y bbase; parse arg d; if d==0 then return 1; p=!.d
do u=d to y; !.u=p+1; if !.u==bbase+u then return .combU(u-1)
p=!.u
.combU: procedure expose !. y bbase; parse arg d; if d==0 then return 1
p= !.d
do u=d to y; !.u= p + 1
if !.u==bbase+u then return .combU(u-1)
p= !.u
end /*u*/
return 0