[R] Subset of a subset?

[jck13]

Hi All-

I have created a subset of my original csv for the times I am interested in
(9, 12, 3). I have a subset for all of those times then each individually. I
would like to have specific case studies to analyze individually for those
times. For example, I want to look at 2009/06/01-2009/06/10. Is the easiest
way to created a subset of ss? I haven't been able to figure out the easiest
way since I created by subsets based on the hour. 

Thanks for any help!!

da=paste(Date)
tiso= strptime(da,format="%d/%m/%Y %H:%M")
tiso$h
df1= data.frame(tiso, mv)

## creating a subset of 9am, 12pm and 3pm.

ss= subset(mv, tiso$h==9| tiso$h ==12| tiso$h==15)
ss9= subset(mv, tiso$h==9)
ss12= subset(mv, tiso$h==12)
ss15= subset (mv, tiso$h==15)

##create a subset of each event

ss0609= subset( ss, tiso==2009-06-01 | tiso==2009-06-02)

Example of Data:
Date	T002_03	T002_25	T004_03	T004_25	T006_03	
31/03/2007 23:00	31	3	18	5	6	5.8	7	3.5
1/4/2007 0:00	30	2	16	5	7	2.5	8	4.7
1/4/2007 1:00	34	1	15	4	7	2.7	12	4.4
1/4/2007 2:00	34	0	11	6	6	2.5	16	4.4
1/4/2007 3:00	37	0	NoData	6	6	2.7	NoData
1/4/2007 4:00	34	1	13	4	5	1.4	12	4
1/4/2007 5:00	23	1	15	2	4	1.4	12	4.5
1/4/2007 6:00	13	1	16	3	3	2.2	14	4.1
1/4/2007 7:00	30	0	10	5	5	2.3	15	4.8
1/4/2007 8:00	36	0	18	4	13	5.3	22	2.7
1/4/2007 9:00	38	0	23	4	23	2.8	31	1.1


  


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