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If you study the solution you have been given until you understand how it
works, and combine that with an understanding of indexing from the Introduction
to R document that comes with R, you should be able to complete your code the
way you want it. Don't abuse the generosity of your helpers.
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Sent from my phone. Please excuse my brevity.
siddu479 <onlyfordigitalst...@gmail.com> wrote:
>Hi Arun,
>
>Thanks for your reply but your script is removing only one row( first
>row
>and last row) for each Unique and StepNo combination and calculating
>mean
>for the rest of rows.
>For below data , your script removing the #'s rows perfectly.
>But in reality I may need to ignore *say first 10 rows and last 20 rows
>for
>each Unique and StepNo combination.
>* for statistics calculation.
> Unique StepNo Data1 Data2
>1 A 1 4 5 #Your script removing this row
>successfully.
>2 A 1 5 6
>3 A 1 7 8
>4 A 1 3 4
>5 A 1 1 1 #Your script removing this row
>successfully.
>6 B 1 2 4 #Your script removing this row
>successfully.
>7 B 1 3 5
>8 B 1 4 5
>9 B 1 5 6
>10 B 1 6 7 #Your script removing this row
>successfully.
>
>Can you modify your script to get my requirement like below (making it
>generic, here *N=2*, removing first 2 lines and last 2 lines..
>*sometimes I
>may have two numbers N1 & N2 (no.of rows need to be removed from and
>top and
>bottom respectively*)
>
> Unique StepNo Data1 Data2
>1 A 1 4 5 #Ignore this
>2 A 1 5 6 #Ignore this
>3 A 1 7 8
>4 A 1 3 4 #Ignore this
>5 A 1 1 1 #Ignore this
>6 B 1 2 4 #Ignore this
>7 B 1 3 5 #Ignore this
>8 B 1 4 5
>9 B 1 5 6 #Ignore this
>10 B 1 6 7 #Ignore this
>
>and then calculate the statistics using ddply.
>
>I hope my problem statement is much clear now.
>
>
>
>
>
>
>
>-----
>Sidda
>Business Analyst Lead
>Applied Materials Inc.
>
>--
>View this message in context:
>http://r.789695.n4.nabble.com/Excluding-fixed-number-of-rows-from-calculation-while-summarizing-using-ddply-function-tp4648406p4648447.html
>Sent from the R help mailing list archive at Nabble.com.
>
>______________________________________________
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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.
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