Re: Find egual number

[Przemek Klosowski]

On 2/9/19 5:58 AM, LucaLuca wrote:
> f=[1   2   3   4   4   7   7   6   8   5]
>
> it's possible to find >1 egual element? i want to know this position
>
> f(4)=4    f(5)=4
>
> f(6)=7  f(7)=7
>
> Ans=4,5
>         6,7

I am genuinely curious---there's what looks like to be a group of 
Italian gentlemen:

address@hidden

address@hidden

address@hidden

that regularly ask about Octave problems that, to me, share some common 
characteristics, in that they explore the intricacies of syntax, in ways 
that don't seem to be connected to actual practical problems. To me, it 
looks like either someone's exploration of intricacies of Matlab, or a 
series of homework etudes. It actually occurred to me that it could be a 
Google algorithm similar to Alpha Zero 
http://science.sciencemag.org/content/362/6419/1140 , trying to learn 
mathematical computing :), especially since when I tried to answer one 
of them (the last one) directly the email address bounced.

But, hey, let's play along. I am not sure that I understand the problem 
as stated above but maybe something along the lines of

k=1:length(f)

find(f(k)==k)

or

find(f(k)!=k)

would be a solution.