On 09/11/2013 09:06 AM, Charles Novaes de Santana wrote:
Dear all,
I am following instructions of FAQ 7.2 (
http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-I-create-rotated-axis-labels_003f)
to create rotated labels in my plots, but I am facing some problems when
plotting variables with small values (in my case, values between 0.001 and
0.007).
When I try to plot these small values, the X-label of my plot doesn't
appear. Please find below the example I am trying to run:
#Definition of my variable and of the labels
a<-c(0.007,0.0004,0.0001)
laba<-c("number1","number2","number3")
#This plot doesn't work fine (label doesn't appear)
par(mar = c(7, 4, 4, 2) + 0.1)
plot(a,xaxt="n",xlab="",ylab="Y-Label")
axis(1,labels=FALSE,tick=FALSE)
mtext(1,text="X-Label",line=6)
text(1:length(a), par("usr")[3] - 0.25, srt = 45, adj = 1,labels = a, xpd =
TRUE,cex=0.75)
#If I just multiply my variable, the plot works fine (label appears)
par(mar = c(7, 4, 4, 2) + 0.1)
plot(1000*a,xaxt="n",xlab="",ylab="Y-Label")
axis(1,labels=FALSE,tick=FALSE)
mtext(1,text="X-Label",line=6)
text(1:length(a), par("usr")[3] - 0.25, srt = 45, adj = 1,labels = laba,
xpd = TRUE,cex=0.75)
Do you have any idea about why is it happening? I much appreciate any help!
Hi Charles,
The problem lies in your specification of the y values for the labels in
the "text" call. Because you are subtracting a large value relative to
the range of y values, the labels are displayed way off the bottom of
the plot. Try this instead:
text(1:length(a),par("usr")[3]-0.0002,srt=45,adj=1,
labels=a,xpd=TRUE,cex=0.75)
If you want to pass explicit values for the positions on the plot, check
them against the x and y ranges.
Jim
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