[R] how to view the top 20 lines in a long dataset

[Erik Iverson]

?head or just

df[1:20, ]

Louis Plough wrote:
> Hi,
> I am simply looking for the function that will allow you to look at the top
> 20 lines of a long dataset?
> 
> LP
> 
> 
> On Mon, Nov 1, 2010 at 10:46 AM, Louis Plough <lplough at usc.edu> wrote:
> 
>> Hi,
>> I am trying to generate all possible permutations (choose 2) of a vector,
>> b, for example--using 'combn' the combinations in only one direction are
>> generated...
>>
>>> b<-c(.1,.2,.3)
>>> combn(b,2)
>>      [,1] [,2] [,3]
>> [1,]  0.1  0.1  0.2
>> [2,]  0.2  0.3  0.3
>>
>>                         [1,] 0.1  0.2  0.3  0.2  0.3  0.3        These
>> should also be there.
>>                         [2,] 0.1  0.2  0.3  0.1  0.1  0.2
>>
>> Is there another R function that can do this??
>>
>> Thanks,
>> Louis
>>
> 
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> 
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