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From: HollyandIvy He on 28 Jan 2010 12:38
I don't know if this is possible. What I'm trying is to produce a row vector contain 6 random values presenting probability, thus the sum should be equal to 1.
From: Steven Lord on 28 Jan 2010 12:44

"HollyandIvy He" <charon13y(a)googlemail.com> wrote in message
news:hjsi1q$bjc$1(a)fred.mathworks.com...
>I don't know if this is possible. What I'm trying is to produce a row
>vector contain 6 random values presenting probability, thus the sum should
>be equal to 1.

You can do this using RAND, ./, and SUM.

--
Steve Lord
slord(a)mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ


From: HollyandIvy He on 28 Jan 2010 13:02
RAND, ./, and SUM

what's the meaning of './,'
I can only think of p=sum(rand(6),1).,Obviously it can not work
From: Steven Lord on 28 Jan 2010 13:21

"HollyandIvy He" <charon13y(a)googlemail.com> wrote in message
news:hjsjfj$cof$1(a)fred.mathworks.com...
> RAND, ./, and SUM
>
> what's the meaning of './,'

Type "help ./" (without the quotes) at the prompt and look for that symbol
in the text that appears. I'm being a little cryptic, I know, but I suspect
this is homework and if that's the case I think you'd get more of a benefit
if you did it (mostly) on your own.

> I can only think of p=sum(rand(6),1).,Obviously it can not work

Actually, I thought of another way (that works because you didn't specify a
distribution) -- generate a random 5 element vector and compute what the 6th
element must be to make it sum to 1.

--
Steve Lord
slord(a)mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ


From: HollyandIvy He on 28 Jan 2010 13:35

>
> Actually, I thought of another way (that works because you didn't specify a
> distribution) -- generate a random 5 element vector and compute what the 6th
> element must be to make it sum to 1.
>
> --
> Steve Lord
> slord(a)mathworks.com
> comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ
>
What if the first 5 exceed 1, any value should be positive between [0,1]
I have also thought about that before
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