[Scilab-users] Loop query

[Lester Anderson]

Thanks for all the guidance guys!

Lester

On Sun, 15 Aug 2021 at 15:33, Stefan Du Rietz <sdr at durietz.se> wrote:

>
>
> On 2021-08-15 15:54, Samuel Gougeon wrote:
> > Le 15/08/2021 à 11:28, Lester Anderson a écrit :
> >> Hello Samuel,
> >>
> >> The size of ns (number of steps) and seq (sequence of values) are
> >> variable depending on the integer input, and this seems to be one issue.
> >
> > For this reason, seq must be a list, leading to
> >
> > function  [ns, seq] = collatz(p)
> >      seq  =  p
> >      while  %T
> >          if  pmodulo(p, 2)
> >              p  =  p*3+1
> >          else
> >              p  =  p/2
> >          end
> >          seq  =  [seq  p]
> >          if  p==1
> >              ns  =  length(seq)
> >              break
> >          end
> >      end
> > endfunction
> >
> > prime = primes(20); [ns, seq] = ([],list()); for  i  =  1:length(prime)
> >      [ns(i),  seq(i)]  =  collatz(prime(i));
> > end --> ns' ans = 2. 8. 6. 17. 15. 10. 13. 21. --> seq seq = (1) = [2,1]
> > (2) = [3,10,5,16,8,4,2,1] (3) = [5,16,8,4,2,1] (4) =
> > [7,22,11,34,17,52,26,13,40,20,10,5,16,8,4,2,1] (5) =
> > [11,34,17,52,26,13,40,20,10,5,16,8,4,2,1] (6) =
> > [13,40,20,10,5,16,8,4,2,1] (7) = [17,52,26,13,40,20,10,5,16,8,4,2,1] (8)
> > = [19,58,29,88,44,22,11,34,17,52,26,13,40,20,10,5,16,8,4,2,1]
> >
> > Samuel
> >
> Of course, Samuel, I didn't realize that the length of seq was not
> monotonically increasing (which I had if I had looked at the displayed
> matrix ...)!
>
> Stefan
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