... Those are bit fields. Basically, the number after the colon describes how many bits that field uses. Here is a quote from MSDN describing bit fields: The constant-expression specifies the width of the field in bits. The type-specifier for the dec...

...it reflects the fact that when you're doing row wise operations you're actually working with tuples from a list of vectors (the columns in a dataframe). share | improve this answer | ...

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