plotting dates in x axis
Hi Maria, First, Excel files don't make it through the Mexican Wall. A CSV with the extension changed to .txt might. You can get all of the years like this: aa<-data.frame(var1=runif(180), SDATE=paste(sample(1998:2012,180,TRUE), sample(1:12,180,TRUE),sample(1:28,180,TRUE),sep="-")) aa$sdate<-as.Date(aa$SDATE) plot(aa$sdate,aa$var1,xaxt="n") library(plotrix) # set the tick marks at the middle of each year axis.dates<-as.Date(paste(1998:2012,6,30,sep="-")) staxlab(1,axis.dates,1998:2012,nlines=3) Obviously you don't want all of the months, so just add the months to the years: plot(aa$sdate,aa$var1,xaxt="n") staxlab(1,axis.dates,format(axis.dates,"%b/%Y"),nlines=3) Jim On Tue, Feb 28, 2017 at 2:26 AM, Maria Lathouri via R-help
<r-help at r-project.org> wrote:
Dear all,
I have an excel file of 180 observations with dates and one variable, from 1998 to 2012 by random months (there are some years that I might not have all the months or I might have two observations in one month). I am trying to plot the dates in x axis and the variable in y axis. I have already used as.Date for the dates so I can import them into R.
Here is my script:> aa<-read.csv("aa.csv")> attach(aa)> names(aa)#"SDATE" "var1"
I convert the dates into R: > sdate<-as.Date(SDATE, format="%Y-%m-%d")
I am plotting the dates with my var1:> plot(sdate, var1, type="l")
Up to now, everything seems ok. However, in the x-axis I only get three years, 2000, 2005 and 2010. As I want to show all the years or at least as many as it could be, I am using the following:
plot(sdate, var1, type="l", xaxt="n")
d1<-c((sdate[1]), (sdate[183]))> d2<-as.Date((d1[1])+365*(0:15)) axis(side=1, at=0:15, labels=strftime(d2, format="%Y"), cex.axis=0.8,las=2); I tried also to plot the dates in a month-Year form:
d2<-as.Date((d1[1])+150*(0:20)) plot(sdate, var1, type="l", xaxt="n")> axis(side=1, at=0:15, labels=strftime(d2, format="%m-%Y"), cex.axis=0.8,las=2)
But nothing happened. I cannot understand why it doesn't show anything. I have attached the file as well in case you want to have a more clear picture. I really appreciate it if you can help me on this. Thank you very much in advance. Kind regards,Maria
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