If poproh.3 was your dataset as a data.frame (an object with row and
column dimensions), you need a comma following the row selection
(sample(...)) to indicate that you want to select those rows and all
columns:
newsample -poprho.3[sample(1:1,100),] # note the last comma in the brackets
General use is:
my.data.frame[rows,columns]
Where either rows or columns (or both) can be left blank to indicate
that you want all of them. Similarly, a selection of the first column
would have been (comma followed by column number):
newsample -poprho.3[sample(1:1,100),1]
That's why your:
newsample -as.matrix(nameofdataset[sample(1:1,100),])
worked; the as.matrix wasn't necessary to simply sample the data.
Cheers,
Jeff.
On Tue, Oct 5, 2010 at 3:54 AM, Jumlong Vongprasert
jumlong.u...@gmail.com wrote:
Dear Jeffrey.
I used newsample -as.matrix(nameofdataset[sample(1:1,100),]).
Now it include all 2 variable.
Thank you for your answer to inspire.
Jumlong
2010/10/5 Jeffrey Spies jsp...@virginia.edu
We'll probably need much more info, but this should get you started:
nameOfDataSet[sample(1:1, 100),]
You can replace the 1 with dim(nameOfDataSet)[1] to make it more
dynamic.
Jeff.
On Tue, Oct 5, 2010 at 3:07 AM, Jumlong Vongprasert
jumlong.u...@gmail.com wrote:
Dear all.
I have data with 2 variable x,y size 1.
I want to sampling from this data with size 100.
How I can do it.
THANK.
--
Jumlong Vongprasert
Institute of Research and Development
Ubon Ratchathani Rajabhat University
Ubon Ratchathani
THAILAND
34000
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--
Jumlong Vongprasert
Institute of Research and Development
Ubon Ratchathani Rajabhat University
Ubon Ratchathani
THAILAND
34000
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R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
