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From: Nazmi Ariff on 18 May 2010 23:37
Hi all,

I want to make a 1000 random data between 0 to 100 range in a 1000 row and 1 column.Now the problem is i dont how to do it.I already tried the command rand(1000,1)*1000 how ever the range are not very detail.I found that it they are no range start with 0.XXXX.So how to do it?..TQ
From: TideMan on 19 May 2010 00:08
On May 19, 3:37 pm, "Nazmi Ariff" <wonderkid...(a)gmail.com> wrote:
> Hi all,
>
> I want to make a 1000 random data between 0 to 100 range in a 1000 row and 1 column.Now the problem is i dont how to do it.I already tried the command rand(1000,1)*1000 how ever the range are not very detail.I found that it they are no range start with 0.XXXX.So how to do it?..TQ

To get a range between zero and 100, you should multiply rand by 100,
not 1000.

But I don't understand this: "the range are not very detail".
Please explain what you mean.
From: us on 19 May 2010 02:43
"Nazmi Ariff" <wonderkid969(a)gmail.com> wrote in message <hsvmd0$9q$1(a)fred.mathworks.com>...
> Hi all,
>
> I want to make a 1000 random data between 0 to 100 range in a 1000 row and 1 column.Now the problem is i dont how to do it.I already tried the command rand(1000,1)*1000 how ever the range are not very detail.I found that it they are no range start with 0.XXXX.So how to do it?..TQ

this is a bit confusing, can you show an example(?)...

us
From: Steven Lord on 19 May 2010 10:14

"Nazmi Ariff" <wonderkid969(a)gmail.com> wrote in message
news:hsvmd0$9q$1(a)fred.mathworks.com...
> Hi all,
>
> I want to make a 1000 random data between 0 to 100 range in a 1000 row and
> 1 column.Now the problem is i dont how to do it.I already tried the
> command rand(1000,1)*1000 how ever the range are not very detail.I found
> that it they are no range start with 0.XXXX.So how to do it?..TQ

Suppose I throw a six-sided die six times. Should I be guaranteed that each
of the numbers 1 through 6 come up exactly once during those six throws?

In fact, for the vector 1000*rand(1000, 1) to result in no values less than
1, that means the random vector created by rand(1000, 1) contained no values
less than (1/1000). Since those numbers are independent, what's the
probability of that happening?

P = (999/1000)^1000

P is not really that small.

You can check this:

function results = simulation(n)
if nargin < 1
n = 100000;
end

P = (999/1000)^1000;
numSuccess = 0;
for k = 1:n
if any(rand(1000, 1) < (1/1000))
numSuccess = numSuccess + 1;
end
end
numTrialsWithoutSmallValues = n - numSuccess;

results = [numTrialsWithoutSmallValues; n*P; ...
numTrialsWithoutSmallValues-n*P];

--
Steve Lord
slord(a)mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ
To contact Technical Support use the Contact Us link on
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