Line types in R : lty

The different line types available in R are shown in the figure hereafter. The argument lty can be used to specify the line type. To change line width, the argument lwd can be used.

The different line types

Line types in R

The function used to generate this figure is provided at the end of this document.

line type (lty) can be specified using either text (“blank”, “solid”, “dashed”, “dotted”, “dotdash”, “longdash”, “twodash”) or number (0, 1, 2, 3, 4, 5, 6). Note that lty = “solid” is identical to lty=1.


# Solid line (by default)
plot(1:10, 1:10, type="l")
# Use dashed line type
plot(1:10, 1:10, type="l", lty=2)
# Change line width
plot(1:10, 1:10, type="l", lty=2, lwd=3)

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By default lty = 1

R script to generate a plot of line types

Use the following R function to display a graph of the line types available in R :

#Line types
  par(font=2, mar=c(0,0,0,0))
  plot(1, pch="", ylim=c(0,6), xlim=c(0,0.7),  axes=FALSE,xlab="", ylab="")
  for(i in 0:6) lines(c(0.3,0.7), c(i,i), lty=i, lwd=3)
  text(rep(0.1,6), 0:6, labels=c("0.'blank'", "1.'solid'", "2.'dashed'", "3.'dotted'",
                                 "4.'dotdash'", "5.'longdash'", "6.'twodash'"))
  par(mar=oldPar$mar,font=oldPar$font )


This analysis has been performed using R (ver. 3.1.0).

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