If you can change the line colour try this
options(mgp=c(2,0.5,0),cex.lab=1.6)
plot(df1$B, predict(regressor,df1),
type="l",
col="grey",
lwd=2,
lty=1,
xlim=range(c(1.2,1.7)),
ylim=rev(range(c(-19,-8))))
lines(df1$B,as.numeric(df1$A),
type="p",
col="black",
cex=2,
pch=17)
box(lwd=3)
Saves typing by using options
Regards
Duncan
Duncan Mackay
Department of Agronomy and Soil Science
University of New England
Armidale NSW 2350
-----Original Message-----
From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of
jean-philippe
Sent: Tuesday, 5 December 2017 04:14
To: R mailing list
Subject: [R] problem with the behaviour of dashed lines in R plots
dear R users,
I am performing a linear regression with lm, and I would like to plot
the regressor in dashed lines. I know that the lty=2 option is the way
out, but it has a very strange behaviour: the line starts dashed but
then the spaces between each dash becomes very tiny and so the line
become somehow continuous for the human eye. Do you know how to fix that
problem, in order to have a dashed line with big enough spaces between
the dashes?
Here is a MWE (don't mind if clearly a linear model will not fit these
"fake randomly generated" data).
Also, changing the plot(...,type="l") to abline(regressor,lty=2,...)
helps and draw a pure dashed line but it is impossible to force it to
stay in the bounds of the data.
Changing to line instead shows the same problem as mentioned here in the
MWE.
pdf("reproducableex.pdf")
df1<-data.frame(B=runif(20,1.4,1.6),A=runif(20,-19.5,-9.8))
regressor<-lm(A~B,data = df1)
plot(df1$B,predict(regressor,df1),type="l", col="black",
mgp=c(2,0.5,0),cex.lab=1.6, lwd=2,
lty=2,xlim=range(c(1.2,1.7)),ylim=rev(range(c(-19,-8))))
par(new = TRUE)
plot(df1$B,as.numeric(df1$A),type="p", col="black",
mgp=c(2,0.5,0),cex.lab=1.6,cex=2, xlab = "", ylab =
"",xlim=range(c(1.2,1.7)),ylim=rev(range(c(-19,-8))),pch=17)
box(lwd=3)
dev.off()
Thanks in advance, best regards
Jean-Philippe Fontaine
--
Jean-Philippe Fontaine
PhD Student in Astroparticle Physics,
Gran Sasso Science Institute (GSSI),
Viale Francesco Crispi 7,
67100 L'Aquila, Italy
Mobile: +393487128593, +33615653774
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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 -- To UNSUBSCRIBE and more, see
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.
