Operating on the value from row i and row i+1
Hi Bert, I should have phrased my question differently. I actually want to do two things. First is to make a step plot. The "s"/"S" is a typo on my part. The second is to write a script that when I ask the program for Response of time == 4, I want it to return "6", or if I ask for response of time == 12, it will return "4", and so on. Pharavee -----Original Message----- From: Bert Gunter [mailto:gunter.berton at gene.com] Sent: Thursday, August 14, 2014 11:27 AM To: Jaiprasart, Pharavee (HSC) Cc: r-help at r-project.org Subject: Re: [R] Operating on the value from row i and row i+1 Your query is a bit unclear, but I suspect ?plot and a **careful read** about types "s" and "S" therein would address your problem. Cheers, Bert Bert Gunter Genentech Nonclinical Biostatistics (650) 467-7374 "Data is not information. Information is not knowledge. And knowledge is certainly not wisdom." Clifford Stoll
On Thu, Aug 14, 2014 at 8:07 AM, Jaiprasart, Pharavee (HSC) <pharavee-jaiprasart at ouhsc.edu> wrote:
Hi all,
I'd like to make a step plot of Time vs Response graph.
This is the example of my data frame - the real data frame has more than a thousand rows.
Time Duration of infusion Infusion Rate Response Subtype
0 3 2 5 0
3 6 3 6 0
9 6 4 4 0
I cannot just use type = c("s") for this because I also want to use the value of the in between time for further calculation too (If I ask the program for Response of time == 4, I want it to return "6").
The way I think the script should work is that:
For all rows that has subtype ==0, if time is between the value of row
/i/ and /i+1/ (e.g. row 1 and 2 which is 0-3), make a new column
"Dummy" and return the value of row /i/ from the Response column (e.g.
5 in this
example) , and do these for all rows (e.g. any time between row 2 and
3 which is 3-9, make a new column and return 6). Then I can say if
Time>0 (value in column1) and <3 (value from column 1+2), y = value in
Dummy
Is there any way to do this in R?
Thanks!
Pharavee
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