[Scilab-users] Loop query

[Stefan Du Rietz]

One solution:

// Run the last (largest):
[ns, seq] = collatz(prime($))

// insert in new zeros vector:
ns = [zeros(prime-1), ns]
// insert seq in new zeros matrix:
seq = [zeros(length(seq), length(ns)-1), seq];

for  i = 1:length(prime)-1
   // Run collatz to get the new ns:
   [nsi, seqi] = collatz(prime(i));
   // insert in vector ns and matrix seq:
   ns(i) = nsi;
   seq(1:nsi, i) = seqi;
end

dispalay ns above seq:
[ns; seq]

Stefan


On 2021-08-15 13:03, Lester Anderson wrote:
> Hi Stefan,
> 
> Thank you for clarifying the meaning of the error message.
> 
> Lester
> 
> On Sun, 15 Aug 2021 at 11:59, Stefan Du Rietz <sdr at durietz.se 
> <mailto:sdr at durietz.se>> wrote:
> 
>     Hello Lester,
>     the problem is that seq in each loop is a vector of increasing length!
> 
>     Stefan
> 
> 
>     On 2021-08-15 12:05, Lester Anderson wrote:
>      > Hi Stefan,
>      >
>      > I did try that before, but got an error - "Submatrix incorrectly
>     defined"
>      >
>      > Lester
>      >
>      > On Sun, 15 Aug 2021 at 10:56, Stefan Du Rietz <sdr at durietz.se
>     <mailto:sdr at durietz.se>
>      > <mailto:sdr at durietz.se <mailto:sdr at durietz.se>>> wrote:
>      >
>      >
>      >
>      >     On 2021-08-15 09:00, Lester Anderson wrote:
>      >      > Hello,
>      >      >
>      >      > Basic query. I have a simple code that applies the Collatz
>      >     conjecture
>      >      > equation (3n+1) by running a function and then runs a loop
>     over the
>      >      > values stored in prime (the first 8 Prime numbers):
>      >      >
>      >      > clear
>      >      >
>      >      > exec('collatz.sci',-1);
>      >      >
>      >      > prime  =  primes(20);
>      >      >
>      >      > for  i  =  1:length(prime)
>      >      >      [ns,  seq]=collatz(prime(i))
>      >      > end
>      >      >
>      >      > As it stands, this just runs to the end (i=8) and the
>     value 19.
>      >     How can
>      >      > I get the code to write the results of each loop pass into the
>      >     variables
>      >      > ns and seq, such that each contains the results of the 8
>     passes?
>      >      >
>      >      > Can no longer search the forums online from the website.
>      >      >
>      >      > Thanks
>      >      > Lester
>      >
>      >
>      >     // Before the for loop:
>      >     ns = zeros(prime);
>      >     seq = ns;
>      >
>      >     // Changed for loop
>      >     for  i  =  1:length(prime)
>      >           [ns(i),  seq(i)]=collatz(prime(i))
>      >     end
>      >
>      >     Regards
>      >     Stefan
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