Problem 2800. arithmetic progression

Created by Guillaume

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I've written a program to generate the first few terms of arithmetic progressions. I've noticed something odd though, there's always one wrong term. Surely, there couldn't be a bug in my code, could it?

Can you tell me the position of the wrong term, and return the correct sequence?

For example, given

errorsequence = [2 4 7 8 10]; %arithmetic sequence starting at 2 with increment 2

then

errorposition = 3;
truesequence = [2 4 6 8 10];

Solve

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207 Solutions
32 Solvers

Last Solution submitted on Oct 27, 2019

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Solution Comments

Solution 552450

1 Comment

1 Comment

J. S. Kowontan on 12 May 2018

input => errorsequence = [10 20 21 40]
output => truesequence = [19 20 21 22] , errorposition = [1 4]
Result: Test fail

Solution 552046

1 Comment

1 Comment

bainhome on 4 Jul 2018

It took me a while to figure this one out. Your mathmatical intuition and ability of code implementation keep stunning me. The solution really a mind blower. Bravo!

Solution 550365

2 Comments

2 Comments

Paul Berglund on 28 Dec 2014

Note that this will fail on a short sequence e.g. [10 20 21 40]

Alfonso Nieto-Castanon on 5 Jan 2015

I believe changing mode to median should work in all non-ambiguous cases (length>3)

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arithmetic progression integer