RosettaCodeData/Task/Knuths-algorithm-S/BBC-BASIC/knuths-algorithm-s.bbc

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HIMEM = PAGE + 20000000
PRINT "Single run samples for n = 3:"
SofN% = FNs_of_n_creator(3)
FOR I% = 0 TO 9
!^a%() = FN(SofN%)(I%)
PRINT " For item " ; I% " sample(s) = " FNshowarray(a%(), I%+1)
NEXT
DIM cnt%(9)
PRINT '"Digit counts after 100000 runs:"
FOR rep% = 1 TO 100000
IF (rep% MOD 1000) = 0 PRINT ; rep% ; CHR$(13) ;
F% = FNs_of_n_creator(3)
FOR I% = 0 TO 9
!^a%() = FN(F%)(I%)
NEXT
cnt%(a%(1)) += 1 : cnt%(a%(2)) += 1 : cnt%(a%(3)) += 1
NEXT
FOR digit% = 0 TO 9
PRINT " " ; digit% " : " ; cnt%(digit%)
NEXT
END
REM Dynamically creates this function:
REM DEF FNfunction(item%) : PRIVATE samples%(), index%
REM DIM samples%(n%) : = FNs_of_n(item%, samples%(), index%)
DEF FNs_of_n_creator(n%)
LOCAL p%, f$
f$ = "(item%) : " + CHR$&0E + " samples%(), index% : " + \
\ CHR$&DE + " samples%(" + STR$(n%) + ") : = " + \
\ CHR$&A4 + "s_of_n(item%, samples%(), index%)"
DIM p% LEN(f$) + 4 : $(p%+4) = f$ : !p% = p%+4
= p%
DEF FNs_of_n(D%, s%(), RETURN I%)
LOCAL N%
N% = DIM(s%(),1)
I% += 1
IF I% <= N% THEN
s%(I%) = D%
ELSE
IF RND(I%) <= N% s%(RND(N%)) = D%
ENDIF
= !^s%()
DEF FNshowarray(a%(), n%)
LOCAL i%, a$
a$ = "["
IF n% > DIM(a%(),1) n% = DIM(a%(),1)
FOR i% = 1 TO n%
a$ += STR$(a%(i%)) + ", "
NEXT
= LEFT$(LEFT$(a$)) + "]"