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how can i determine type of variable in R? 

t <- seq(from=0, to=10, by=2)
p <- 2

t and p are both: is.numeric, is.atomic, is.vector, not is.list, typeof double, class numeric.

How to determine that p is just only a number and that t is something more?

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    You want to find that `p` is numeric and `t` is a vector of numeric? –  Mar 06 '15 at 03:36
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    See http://stackoverflow.com/questions/6258004/r-types-and-classes-of-variables?rq=1 – Benjamin Mar 06 '15 at 03:36
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    @Benjamin Good reference but I am not sure that helps here: `class`, `mode` and `typeof` return always the same value for `t` and `p`. – RockScience Mar 06 '15 at 03:41
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    It might be helpful for you to know that there is no "scalar" data type in R. Everything is a vector, and "single numbers" are also stored internally as a vector of length one. So `p` and `t` really are the same type of thing, they differ only in length. – joran Mar 06 '15 at 04:09

1 Answers1

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To know the class of an object in R: 

class(t)
class(p)

These 2 objects share the same class numeric (they are actually both vectors of numerics, even p is a vector of length 1).

So to differenciate them you should use length:

length(t)
length(p)
RockScience
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