[R] Script for conditional sums of vectors
Hi guys, I hope you can help me with this (probably) simple query: I have a data frame: -- a=c(1,1,1,1,1,1,2,2,2,2,2,2) b=c(1,1,1,2,3,4,1,1,2,2,3,4) c=c(400,200,300,100,500,300,200,100,500,400,200,100) data=data.frame(a=a,b=b,c=c) -- And I would like to get the following output: -- b a 1 2 3 4 1 900 100 500 300 2 300 900 200 100 -- The values in the output represent the sum of values c in data frame data, for each a and b combination. For example, where a = 1 and b = 1, the output is 400+200+300 = 900. Please would anyone be able to provide a script to create my desired output? Many thanks in advance, Ben Gillespie Research Postgraduate School of Geography University of Leeds Leeds LS2 9JT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Script for conditional sums of vectors
Hi Ben, let me suggest some background reading - Peter Dalgaard's or Phil Spector's book will set you up with what you need. You can also read one of the many free, contributed sets of notes kept on CRAN. I hope that this helps Andrew On Mon, Feb 4, 2013 at 8:29 PM, Benjamin Gillespie gy...@leeds.ac.ukwrote: Hi guys, I hope you can help me with this (probably) simple query: I have a data frame: -- a=c(1,1,1,1,1,1,2,2,2,2,2,2) b=c(1,1,1,2,3,4,1,1,2,2,3,4) c=c(400,200,300,100,500,300,200,100,500,400,200,100) data=data.frame(a=a,b=b,c=c) -- And I would like to get the following output: -- b a 1 2 3 4 1 900 100 500 300 2 300 900 200 100 -- The values in the output represent the sum of values c in data frame data, for each a and b combination. For example, where a = 1 and b = 1, the output is 400+200+300 = 900. Please would anyone be able to provide a script to create my desired output? Many thanks in advance, Ben Gillespie Research Postgraduate School of Geography University of Leeds Leeds LS2 9JT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Andrew Robinson Director (A/g), ACERA Senior Lecturer in Applied Statistics Tel: +61-3-8344-6410 Department of Mathematics and StatisticsFax: +61-3-8344 4599 University of Melbourne, VIC 3010 Australia Email: a.robin...@ms.unimelb.edu.auWebsite: http://www.ms.unimelb.edu.au FAwR: http://www.ms.unimelb.edu.au/~andrewpr/FAwR/ SPuR: http://www.ms.unimelb.edu.au/spuRs/ [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Script for conditional sums of vectors
try this: a - c(1,1,1,1,1,1,2,2,2,2,2,2) b - c(1,1,1,2,3,4,1,1,2,2,3,4) c - c(400,200,300,100,500,300,200,100,500,400,200,100) DF - data.frame(a, b, c) with(DF, tapply(c, list(a, b), sum)) I hope it helps. Best, Dimitris On 2/4/2013 10:29 AM, Benjamin Gillespie wrote: Hi guys, I hope you can help me with this (probably) simple query: I have a data frame: -- a=c(1,1,1,1,1,1,2,2,2,2,2,2) b=c(1,1,1,2,3,4,1,1,2,2,3,4) c=c(400,200,300,100,500,300,200,100,500,400,200,100) data=data.frame(a=a,b=b,c=c) -- And I would like to get the following output: -- b a 1 2 3 4 1 900 100 500 300 2 300 900 200 100 -- The values in the output represent the sum of values c in data frame data, for each a and b combination. For example, where a = 1 and b = 1, the output is 400+200+300 = 900. Please would anyone be able to provide a script to create my desired output? Many thanks in advance, Ben Gillespie Research Postgraduate School of Geography University of Leeds Leeds LS2 9JT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Dimitris Rizopoulos Assistant Professor Department of Biostatistics Erasmus University Medical Center Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands Tel: +31/(0)10/7043478 Fax: +31/(0)10/7043014 Web: http://www.erasmusmc.nl/biostatistiek/ __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Script for conditional sums of vectors
Here are some examples of data aggregation functions in R: http://www.slideshare.net/djandrija/data-aggregation-in-r http://www.psychwire.co.uk/2011/04/data-aggregation-in-r-plyr-sqldf-and-data-table/ Andrija On Mon, Feb 4, 2013 at 10:29 AM, Benjamin Gillespie gy...@leeds.ac.ukwrote: Hi guys, I hope you can help me with this (probably) simple query: I have a data frame: -- a=c(1,1,1,1,1,1,2,2,2,2,2,2) b=c(1,1,1,2,3,4,1,1,2,2,3,4) c=c(400,200,300,100,500,300,200,100,500,400,200,100) data=data.frame(a=a,b=b,c=c) -- And I would like to get the following output: -- b a 1 2 3 4 1 900 100 500 300 2 300 900 200 100 -- The values in the output represent the sum of values c in data frame data, for each a and b combination. For example, where a = 1 and b = 1, the output is 400+200+300 = 900. Please would anyone be able to provide a script to create my desired output? Many thanks in advance, Ben Gillespie Research Postgraduate School of Geography University of Leeds Leeds LS2 9JT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Script for conditional sums of vectors
Hello,
First, don't use data for a data frame, as it is a R function.
Here is a way to do what you are looking for:
a=c(1,1,1,1,1,1,2,2,2,2,2,2)
b=c(1,1,1,2,3,4,1,1,2,2,3,4)
c=c(400,200,300,100,500,300,200,100,500,400,200,100)
dat=data.frame(a=a,b=b,c=c)
dat.sum - aggregate(c ~ a+b, dat, sum)
dat.sum - reshape(dat.sum, timevar='b', idvar='a', direction='wide')
colnames(dat.sum) - c('a','b.1','b.2','b.3','b.4')
HTH,
Pascal
Le 04/02/2013 18:29, Benjamin Gillespie a écrit :
Hi guys,
I hope you can help me with this (probably) simple query:
I have a data frame:
--
a=c(1,1,1,1,1,1,2,2,2,2,2,2)
b=c(1,1,1,2,3,4,1,1,2,2,3,4)
c=c(400,200,300,100,500,300,200,100,500,400,200,100)
data=data.frame(a=a,b=b,c=c)
--
And I would like to get the following output:
--
b
a 1 2 3 4
1 900 100 500 300
2 300 900 200 100
--
The values in the output represent the sum of values c in data frame data, for each
a and b combination.
For example, where a = 1 and b = 1, the output is 400+200+300 = 900.
Please would anyone be able to provide a script to create my desired output?
Many thanks in advance,
Ben Gillespie
Research Postgraduate
School of Geography
University of Leeds
Leeds
LS2 9JT
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] Script for conditional sums of vectors
Thanks everyone - this seems to be the most efficient answer, I'll do a bit of reading around too as suggested. Thanks again, Ben Gillespie Research Postgraduate School of Geography University of Leeds Leeds LS2 9JT From: D. Rizopoulos [d.rizopou...@erasmusmc.nl] Sent: 04 February 2013 09:35 To: Benjamin Gillespie Cc: r-help@r-project.org Subject: Re: [R] Script for conditional sums of vectors try this: a - c(1,1,1,1,1,1,2,2,2,2,2,2) b - c(1,1,1,2,3,4,1,1,2,2,3,4) c - c(400,200,300,100,500,300,200,100,500,400,200,100) DF - data.frame(a, b, c) with(DF, tapply(c, list(a, b), sum)) I hope it helps. Best, Dimitris On 2/4/2013 10:29 AM, Benjamin Gillespie wrote: Hi guys, I hope you can help me with this (probably) simple query: I have a data frame: -- a=c(1,1,1,1,1,1,2,2,2,2,2,2) b=c(1,1,1,2,3,4,1,1,2,2,3,4) c=c(400,200,300,100,500,300,200,100,500,400,200,100) data=data.frame(a=a,b=b,c=c) -- And I would like to get the following output: -- b a 1 2 3 4 1 900 100 500 300 2 300 900 200 100 -- The values in the output represent the sum of values c in data frame data, for each a and b combination. For example, where a = 1 and b = 1, the output is 400+200+300 = 900. Please would anyone be able to provide a script to create my desired output? Many thanks in advance, Ben Gillespie Research Postgraduate School of Geography University of Leeds Leeds LS2 9JT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Dimitris Rizopoulos Assistant Professor Department of Biostatistics Erasmus University Medical Center Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands Tel: +31/(0)10/7043478 Fax: +31/(0)10/7043014 Web: http://www.erasmusmc.nl/biostatistiek/ __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Script for conditional sums of vectors
Hello, In what follows, I've renamed the data.frame 'dat', 'data' already is an R function. xtabs(c ~ a + b, data = dat) Hope this helps, Rui Barradas Em 04-02-2013 09:29, Benjamin Gillespie escreveu: Hi guys, I hope you can help me with this (probably) simple query: I have a data frame: -- a=c(1,1,1,1,1,1,2,2,2,2,2,2) b=c(1,1,1,2,3,4,1,1,2,2,3,4) c=c(400,200,300,100,500,300,200,100,500,400,200,100) data=data.frame(a=a,b=b,c=c) -- And I would like to get the following output: -- b a 1 2 3 4 1 900 100 500 300 2 300 900 200 100 -- The values in the output represent the sum of values c in data frame data, for each a and b combination. For example, where a = 1 and b = 1, the output is 400+200+300 = 900. Please would anyone be able to provide a script to create my desired output? Many thanks in advance, Ben Gillespie Research Postgraduate School of Geography University of Leeds Leeds LS2 9JT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Script for conditional sums of vectors
Hi, library(reshape2) dcast(DF,a~b,value.var=c,sum) # a 1 2 3 4 #1 1 900 100 500 300 #2 2 300 900 200 100 A.K. - Original Message - From: Benjamin Gillespie gy...@leeds.ac.uk To: r-help@r-project.org r-help@r-project.org Cc: Sent: Monday, February 4, 2013 4:29 AM Subject: [R] Script for conditional sums of vectors Hi guys, I hope you can help me with this (probably) simple query: I have a data frame: -- a=c(1,1,1,1,1,1,2,2,2,2,2,2) b=c(1,1,1,2,3,4,1,1,2,2,3,4) c=c(400,200,300,100,500,300,200,100,500,400,200,100) data=data.frame(a=a,b=b,c=c) -- And I would like to get the following output: -- b a 1 2 3 4 1 900 100 500 300 2 300 900 200 100 -- The values in the output represent the sum of values c in data frame data, for each a and b combination. For example, where a = 1 and b = 1, the output is 400+200+300 = 900. Please would anyone be able to provide a script to create my desired output? Many thanks in advance, Ben Gillespie Research Postgraduate School of Geography University of Leeds Leeds LS2 9JT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
