[R] Unexpected Gap in simple line plot

Bill.Venables at csiro.au Bill.Venables at csiro.au
Fri Jan 21 02:39:01 CET 2011

You do have missing values.  Setting xlim does not subset the data. 

How about

link <- "http://processtrends.com/files/RClimate_CTS_latest.csv"
cts <- read.csv(link, header = TRUE)

scts <- subset(cts, !is.na(GISS) & !is.na(cts))   ## remove defectives

plot(GISS ~ yr_frac, scts, type = "l", xlim = c(1982, 1983),
     xaxs = "i", yaxs = "i")
points(GISS ~ yr_frac, scts, type = "p", col = "red")


Bill Venables
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of D Kelly O'Day
Sent: Friday, 21 January 2011 11:12 AM
To: r-help at r-project.org
Subject: [R] Unexpected Gap in simple line plot

I am getting an unexpected gap in a simple plot of monthly data series.

I have created a csv file of monthly climate observations that I store
on-line. When I download the csv file and plot one of the series, I get a
gap even though there is data for the missing point.

Here is a snippet to show the problem.

  ## Strange plot results
    link <- "http://processtrends.com/files/RClimate_CTS_latest.csv"
    cts <- read.csv(link, header=T)

    ## Simple line plot - gap for no reason
    plot(cts$yr_frac, cts$GISS, type="l", xlim=c(1982, 1983),xaxs="i",

   ## May, 1982 observation missing
   ## Add points to plot in red, to see if May shows up
   points(cts$yr_frac, cts$GISS, type="p", col="red")
   ## yes, May shows up in points

## Look at cts data.frame. No obvious problems to me??
  small <- subset(cts, cts$yr_frac >1982 & cts$yr_frac <1983)

The same problem occurs in the other data vectors (HAD, NOAA, RSS, UAH, etc)

I have not been able to figure why I am getting the gap and how to show a
continuous line through May, 1982 data points.

Any suggestions?

D Kelly O'Day
http://chartsgraphs.worpress.com http://chartsgraphs.wordprss.com 

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