About
Str display compactly the internal structure of an R object.
Str is an alternative for summary
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Example
> v <- c(1,-2,3.3,7,-3)
> str(v)
num [1:5] 1 -2 3.3 7 -3
where
- num: indicates the numeric class
- [1:5]: from one to 5 elements
- 1 -2 3.3 7 -3: the elements