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?
I have fixed test suite.
The test sets 2,3,5, and 6 have a problem with x. It should probably read 5.7 and not 5,7
Replace multiples of 5 with NaN
Is it a number?
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