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seedy random numbers
Try
<cfset x=randomize(someinteger)>
<cfset y=randrange(1,100)>
<cfoutput>#y#</cfoutput>
The result of the randomize() function is not random as stated in the
Language Reference. I generally use a timestamp as the seed value.
DC
-----Original Message-----
From: Gavin Myers [mailto:[EMAIL PROTECTED]]
Sent: Friday, October 06, 2000 21:35
To: CF-Talk
Subject: seedy random numbers
okay, i've looked into randomize()
and from b.f.'s book it states:
Randomize(Number) seed the random number generator with the passed number
so if I do this:
<cfoutput>
#Randomize(1)#<br>
<cfset x = randrange(1,100)>
#x#
</cfoutput>
I get:
0.31415822
41
If I put #randomize(2)# instead of 1 i get:
0.62831643
50
with that being said, i could randomze off the timer... but as far as i
can
see the timer runs only in seconds... wich would be bad.
So this boils down to:
Question 1 Is it important to seed the randomizer before using random
commands? Or does cf automatically do this. The odd part is if it does do
this automatically then why would we need a seed in the first place?
Question 2 If it doesnt how can i seed the random number generator? If cf
doesnt auto-seed the random number generator then I cant do this:
<cfset x = randrange(1,100)>
#x#
</cfoutput>
#randomize(x)#
because the randrange wouldn't be seedy and random. Wich brings me over to
question 3
How can i use randomize(x) in a fasion that would make it not show up?
Because in order to use it in the way stated above i have to turn it into
a
variable...
do i do this:
#randomize(124, randrange(x))#
or would it be more like
#randomize(124, x)#
i don't understand why we still have to seed the randomizer... I know a
computer cannot technically whip out random numbers, but the moment you
ask
like yyyy:dd:mm:hh:mm:ssssssssssssssssssssssssssssssssssssssss
should get a pretty random number... unles again if you have a site that
gets tons of hits per day, there could be a chance of 2 people calling the
same thing the same second (or even mili-second) and that may depend on
how
cold fusion server side works.
feh
gavin
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<HTML><HEAD><TITLE>seedy random numbers</TITLE>
<META content=3D"text/html; charset=3Diso-8859-1" =
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<BODY>
<DIV> </DIV>
<DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20
class=3D338294912-09102000>Try</SPAN></FONT></DIV>
<DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20
class=3D338294912-09102000></SPAN></FONT> </DIV>
<DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20
class=3D338294912-09102000><cfset=20
x=3Drandomize(someinteger)></SPAN></FONT></DIV>
<DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20
class=3D338294912-09102000></SPAN></FONT> </DIV>
<DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20
class=3D338294912-09102000><cfset =
y=3Drandrange(1,100)></SPAN></FONT></DIV>
<DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20
class=3D338294912-09102000></SPAN></FONT> </DIV>
<DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20
class=3D338294912-09102000><cfoutput>#y#</cfoutput></SPAN></F=
ONT></DIV>
<DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20
class=3D338294912-09102000></SPAN></FONT> </DIV>
<DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN =
class=3D338294912-09102000>The=20
result of the randomize() function is not random as stated in the =
Language=20
Reference. I generally use a timestamp as the seed=20
value. </SPAN></FONT></DIV>
<DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20
class=3D338294912-09102000></SPAN></FONT> </DIV>
<DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20
class=3D338294912-09102000>DC</SPAN></FONT></DIV>
<DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20
class=3D338294912-09102000></SPAN></FONT> </DIV>
<BLOCKQUOTE style=3D"MARGIN-RIGHT: 0px">
<DIV align=3Dleft class=3DOutlookMessageHeader dir=3Dltr><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B> Gavin Myers=20
[mailto:[EMAIL PROTECTED]]<BR><B>Sent:</B> Friday, October =
06, 2000=20
21:35<BR><B>To:</B> CF-Talk<BR><B>Subject:</B> seedy random=20
numbers<BR><BR></DIV></FONT>
<P><FONT size=3D2>okay, i've looked into randomize()</FONT> <BR><FONT =
size=3D2>and=20
from b.f.'s book it states:</FONT> </P><BR>
<P><FONT size=3D2>Randomize(Number) seed the random number generator =
with the=20
passed number</FONT> </P>
<P><FONT size=3D2>so if I do this:</FONT> </P>
<P><FONT size=3D2><cfoutput></FONT> <BR><FONT=20
size=3D2>#Randomize(1)#<br></FONT> <BR><FONT size=3D2><cfset =
x =3D=20
randrange(1,100)></FONT> <BR><FONT size=3D2>#x#</FONT> <BR><FONT=20
size=3D2></cfoutput></FONT> </P>
<P><FONT size=3D2>I get:</FONT> </P>
<P><FONT size=3D2>0.31415822</FONT> <BR><FONT size=3D2>41</FONT> =
</P><BR>
<P><FONT size=3D2>If I put #randomize(2)# instead of 1 i get:</FONT> =
</P>
<P><FONT size=3D2>0.62831643</FONT> <BR><FONT size=3D2>50 =
</FONT></P><BR>
<P><FONT size=3D2>with that being said, i could randomze off the =
timer... but as=20
far as i can</FONT> <BR><FONT size=3D2>see the timer runs only in =
seconds...=20
wich would be bad.</FONT> </P>
<P><FONT size=3D2>So this boils down to:</FONT> </P>
<P><FONT size=3D2>Question 1 Is it important to seed the randomizer =
before using=20
random</FONT> <BR><FONT size=3D2>commands? Or does cf automatically do =
this. The=20
odd part is if it does do</FONT> <BR><FONT size=3D2>this automatically =
then why=20
would we need a seed in the first place?</FONT> </P>
<P><FONT size=3D2>Question 2 If it doesnt how can i seed the random =
number=20
generator? If cf</FONT> <BR><FONT size=3D2>doesnt auto-seed the random =
number=20
generator then I cant do this:</FONT> </P>
<P><FONT size=3D2><cfset x =3D randrange(1,100)></FONT> =
<BR><FONT=20
size=3D2>#x#</FONT> <BR><FONT size=3D2></cfoutput></FONT> </P>
<P><FONT size=3D2>#randomize(x)#</FONT> </P>
<P><FONT size=3D2>because the randrange wouldn't be seedy and random. =
Wich=20
brings me over to</FONT> <BR><FONT size=3D2>question 3</FONT> </P>
<P><FONT size=3D2>How can i use randomize(x) in a fasion that would =
make it not=20
show up?</FONT> <BR><FONT size=3D2>Because in order to use it in the =
way stated=20
above i have to turn it into a</FONT> <BR><FONT =
size=3D2>variable...</FONT> </P>
<P><FONT size=3D2>do i do this:</FONT> </P>
<P><FONT size=3D2>#randomize(124, randrange(x))#</FONT> </P>
<P><FONT size=3D2>or would it be more like</FONT> </P>
<P><FONT size=3D2>#randomize(124, x)#</FONT> </P><BR>
<P><FONT size=3D2>i don't understand why we still have to seed the =
randomizer...=20
I know a</FONT> <BR><FONT size=3D2>computer cannot technically whip =
out random=20
numbers, but the moment you ask</FONT> <BR><FONT size=3D2>like=20
yyyy:dd:mm:hh:mm:ssssssssssssssssssssssssssssssssssssssss</FONT> =
<BR><FONT=20
size=3D2>should get a pretty random number... unles again if you have =
a site=20
that</FONT> <BR><FONT size=3D2>gets tons of hits per day, there could =
be a=20
chance of 2 people calling the</FONT> <BR><FONT size=3D2>same thing =
the same=20
second (or even mili-second) and that may depend on how</FONT> =
<BR><FONT=20
size=3D2>cold fusion server side works.</FONT> </P>
<P><FONT size=3D2>feh</FONT> </P>
<P><FONT size=3D2>gavin</FONT> <BR><FONT=20
=
size=3D2>----------------------------------------------------------------=
--------------</FONT>=20
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