Problem 42481. Low level NaN

Created by Mehmet OZC

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I have a dataset. Columns represents different variables.
A variable may start with NaN or any double type number.
If it starts with double number it continues with double type numbers.
If it starts with NaN, we do not know when it ends.
Return the row index where last NaN is observed in overall dataset. (Think column-wise)
Input
[ 1 NaN 5 NaN 2
2 NaN 4 4 8
6 NaN 8 2 4
0 0 0 0 0]
should return 3 because last NaN is observed in third row.
Test suite may be changed!

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Last Solution submitted on May 07, 2025

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Alfonso Nieto-Castanon on 31 Jul 2015

there seem to be some problems with the testsuite, in particular some of those matrices contain different number of elements per row (e.g. perhaps "5,7" should be "5.7"). I guess the same applies to your example dataset where the last row contains only four numbers instead of five?

Mehmet OZC on 1 Aug 2015

I have fixed test suite.

Christian Schröder on 23 Oct 2022

The example from the problem description isn't a valid matrix; the last row has 4 entries rather than 5.

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Problem 42481. Low level NaN

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Problem 42481. Low level NaN

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