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Remove uses of old random generator #808

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May 31, 2016
Merged

Remove uses of old random generator #808

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14 changes: 6 additions & 8 deletions lib/stbcrand.gi
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Original file line number Diff line number Diff line change
Expand Up @@ -975,15 +975,15 @@ InstallGlobalFunction( SCRRandomString, function ( n )
local i, j, # loop variables
k, # number of 28 long substrings
rnd, # the random number which would be created by Random
string; # the random string constructed
string, # the random string constructed
range; # Upper value of range used for getting ints

range := 2^28-1;

string:=[];
k:=QuoInt(n-1,28);
for i in [0..k-1] do
# follow steps in Random to create a random number < 2^28
R_N := R_N mod 55 + 1;
R_X[R_N] := (R_X[R_N] + R_X[(R_N+30) mod 55+1]) mod 2^28;
rnd:=R_X[R_N];
rnd := Random(0,range);
# use each bit of rnd
for j in [1 .. 28] do
string[28*i+j] := rnd mod 2;
Expand All @@ -992,9 +992,7 @@ InstallGlobalFunction( SCRRandomString, function ( n )
od;

# construct last <= 28 bits of string
R_N := R_N mod 55 + 1;
R_X[R_N] := (R_X[R_N] + R_X[(R_N+30) mod 55+1]) mod 2^28;
rnd:=R_X[R_N];
rnd := Random(0, range);
for j in [28*k+1 .. n] do
string[j] := rnd mod 2;
rnd := QuoInt(rnd,2);
Expand Down