How to write an iterated function in Pari/GP

Asked Dec 29 '21 at 20:03

Active Dec 29 '21 at 21:09

Viewed 154 times

I am absolutely new to pari/gp. After watching a few videos on YouTube and looking through some online pdf tutorial files, 5 hours later I am still at a loss on how to write the iterated function below. I was using Excel but needed something that can handle very large numbers and was introduced to pari. The Excel formula is very simple and goes like this for b = 7 and c = 9/7:
(1) with numbers 1 to 10^5 in Column A;
(2) type the formula =IF(MOD(A1,7)=0,A1/7,CEILING(A1*9/7,1)) in B1; and
(3) drag B1 down to A100000 then drag the entire column horizontally as far as needed.

Iterated Function

Any help would be greatly appreciated.

edited Dec 29 '21 at 21:09

asked Dec 29 '21 at 20:03

Math777

You should retag this from `[pari]` to `[pari-gp]`, which is the correct tag for Pari/GP questions (can't edit because edit queue is full) – astroide Dec 29 '21 at 20:33
@astroide Thanks. Will do. – Math777 Dec 29 '21 at 21:10
I posted a solution in https://math.stackexchange.com/a/4345437/1714 (needs Pari/GP version \ge 2.13.0 ) – Gottfried Helms Dec 30 '21 at 20:35

How to write an iterated function in Pari/GP

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