HITS-TOS/TACO

Handling of value NA (not available) of R not supported in Python

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The special value NA used in R for values which are not available is not supported in python. For floating point numbers is would be possible to use NaN (not a number) instead. But for integer data (e.g. l, n) this is also not supported. A common solution for positive integers is the use of -1 for unavailable data. It must be checked if this is possible for all cases.

Decision of @saskiahekker: Usage of floating point type for integer data and NaN for not available.