Re: Value of a random variable X at Time t

On Sat, Jun 12, 2021 at 2:36 AM umairjamali <[email protected]>
wrote:

> BGreen wrote
> > On Fri, Jun 11, 2021 at 3:52 PM umairjamali &lt;
>
> > umairahmedjamali@
>
> > &gt;
> > wrote:
> >
> >> I defined a vector P that contains my probability distribution for a
> Dice
> >> Roll, i.e. 6 equal probabilities for each outcome.
> >>
> >> Now, I want to define a variable T5 such that P[T5=t] = P{Xt is the
> first
> >> random variable with outcome 5}
> >> In other words: I start my process of tossing a die and T5 is the first
> >> time
> >> a 5 is diced.
> >>
> >> How would I define it with an expression?
> >>
> >> --
> >> Sent from:
> >> https://octave.1599824.n4.nabble.com/Octave-General-f1599825.html
> >>
> >
> > You can use the rand function
> > &lt;https://octave.sourceforge.io/octave/function/rand.html&gt; to
> > generate
> > random numbers, and then scale or round them to be uniform 1 through 6.
> > P = floor(6*rand(1,N)+1)
> > Then use find
> > &lt;https://octav
> <https://octave.sourceforge.io/octave/function/find.html&gt>" mean(29):
> out of bound 1 (dimensions are 1x1) (note: variable 'mean'

shadows

>  function)"e.sourceforge.io/octave/function/find.html&gt
> <https://octave.sourceforge.io/octave/function/find.html&gt>; to
> > get the indices of all entries equal to 5:
> > T = find(P==5)
> > The first time a 5 is rolled is just the first element of T, i.e. it is
> > T(1)..
>
> Thank you. The find function worked and gave me and output of all times at
> which T==5. Now , I want to calculate the mean of those times but when I
> type mean(T) , it gives error:
>
> " mean(29): out of bound 1 (dimensions are 1x1) (note: variable 'mean'
> shadows
>  function)"
>
> Did you notice what the Note says?
You have made a new variable named "mean". So now Octave tries to use your
new variable when you ask for the "mean" of a vector.

Rename your local var. to mean2 or some other name.
Use the clear function to remove all  old var names.


> The output that I got from T=find(P==5) was something like this :
> T =
>
>    10   11   13   14   15   29
>
> Is it a matrix or vector? In any case, how do I calculate the mean of this
> output?
>
>
>
>
> --
> Sent from:
> https://octave.1599824.n4.nabble.com/Octave-General-f1599825.html
>
>
>

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