Hi, Look at the help page for ?Logic, and in particular the section that describes "&" and "|".
Best, Ista On Mon, Feb 4, 2013 at 9:01 AM, skpark <birdfir...@naver.com> wrote: > Hello, > > > I have trouble with using data.frame data. > > 1. I loaded data using the following: > ff <- read.table("E:/R/VM/matrix.txt", header=T) > The data I used is attached. > > I want to use at least 2 conditions for selecting of data. But I failed. > > It works. -> > fff <- ff[ff$HG == "GUEST",] > ffff <- fff[fff$WR == "READ",] > > But it doesn't work -> ff[ff$HG == "GUEST",ff$WR=="READ"] > > How can I use 2 or more conditions together in one sentence ? > > 2. I want to plot Throuput data using BlockSize as x-axis like the following: > plot(ffff$BlockSize, ffff$Throughput, type="o") > > But, Gap between 2 axis values are not consistent in the graph. > > So I tried to use log() like the following: > plot( log(ffff$BlockSize), ffff$Throughput, type="o") > > The problem seems to be fixed. > But x-axis sting is shown not as (1,2,4,8,16,32,64,128) but as (0,1,2,3,4,5), > which is not my intention. > > How can I fix this problem ? > > Thanks in advance, > SK Park > > > ______________________________________________ > 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.