Problem 42839. Identify the sequence

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Given a row vector, x, return 1 if it is an arithmetic series, or 2 if it is a geometric series. If it is neither, return 0.

Example 1:

x = 1:8

y = 1

Example 2:

x = 2^(1:8)

y = 2

Example 3:

x = [1 1 2 3 5 8 13 21 34]

y = 0

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115 Solutions

31 Solvers

Last Solution submitted on Jul 10, 2026

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Peng Liu on 2 May 2016

Perhaps a better strategy is to make a new problem instead of frequently re-scoring due to incremental changes. BTW, the newly added last test case (#11) should return 2, not 1.

Jean-Marie Sainthillier on 2 May 2016

Yes, Test 11 -> 2

Tim on 5 May 2016

Test case 11 is still incorrect.

Jean-Marie Sainthillier on 9 May 2016

x = [i -2 -4i 8 16i] is an arithmetic serie ?

HH on 27 May 2016

Test case 11 fixed. Thanks.

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