Hi,
On Sep 16, 2009, at 1:42 PM, ogbos okike wrote:
Good evening to everybody. I have a data of four columns - three of
the
columns represent date while the fourth is counts. Setting 4000 as my
minimum point/value, I wish to find out the number of counts that
are less
or equal to 4000 and the dates they occur. I have installed pastecs
and have
been trying to use turnpoints function to do this. I have not been
much
lucky. I am a still learning. I have added part of my data here
where y
stands for year, m month, d day and lastly the count.
I would be grateful to anyone who could show me the way the do this.
Best regards
Ogbos
y m d count
93 02 07 3974.6
93 02 08 3976.7
93 02 09 3955.2
93 02 10 3955.0
93 02 11 3971.8
93 02 12 3972.8
93 02 13 3961.0
93 02 14 3972.8
93 02 15 4008.0
93 02 16 4004.2
93 02 17 3981.2
93 02 18 3996.8
93 02 19 4028.2
93 02 20 4029.5
93 02 21 3953.4
93 02 22 3857.3
93 02 23 3848.3
93 02 24 3869.8
93 02 25 3898.1
93 02 26 3920.5
93 02 27 3936.7
93 02 28 3931.9
Assume your data is stored in a variable called df
Look at what this gives you:
R> less4000 <- df$count < 4000
1. You can sum that vector to tell you how many rows have count less
than 4000
2. You can use it to select out of the vector.
R> df[less4000,]
You can also use the subset function
R> subset(df, count < 4000)
-steve
--
Steve Lianoglou
Graduate Student: Computational Systems Biology
| Memorial Sloan-Kettering Cancer Center
| Weill Medical College of Cornell University
Contact Info: http://cbio.mskcc.org/~lianos/contact
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