[R] Multiple plot in a page

[roslinazairimah zakaria]

Dear r-users,

I would like to plot 4 graphs arranged as 2 by 2 and follows are my codes.
However, it only shows one graph.

par(mfrow=c(1,2))

par(mar=c(4,4,2,1.2),oma=c(0,0,0,0),xaxs="i", yaxs="i")  ## To control
white space around and between the plots
hist(stn_all[,1],prob=TRUE, main ="Balok ",col="yellowgreen", cex.axis=1.2,
xlab="Rain (mm)", ylab="Relative frequency", ylim= c(0,.004),
xlim=c(0,1200))
lines(x, dgam1,col="red",lwd=3)
legend("topright", legend = c("observed","fitted"),
       col = c("yellowgreen", "red"), pch=c(15,NA), lty = c(0, 1),
       lwd=c(0,3),bty="n", pt.cex=2)
text(100,.012 , expression(paste(beta==64.64)))
box()

par(mar=c(4,4,2,1.2),oma=c(0,0,0,0),xaxs="i", yaxs="i")  ## To control
white space around and between the plots
hist(stn_all[,2],prob=TRUE, main ="Gambang ",col="yellowgreen",
cex.axis=1.2,
xlab="Rain (mm)", ylab="Relative frequency", ylim= c(0,.004),
xlim=c(0,1200))
lines(x, dgam2,col="red",lwd=3)
legend("topright", legend = c("observed","fitted"),
       col = c("yellowgreen", "red"), pch=c(15,NA), lty = c(0, 1),
       lwd=c(0,3),bty="n", pt.cex=2)
text(100,.012 , expression(paste(beta==64.64)))
box()


Thank you for your help.

-- 
*Dr. Roslinazairimah Binti Zakaria*
*Tel: +609-5492370; Fax. No.+609-5492766*

*Email: roslinazairimah at ump.edu.my <roslinazairimah at ump.edu.my>;
roslinaump at gmail.com <roslinaump at gmail.com>*
Deputy Dean (Academic & Student Affairs)
Faculty of Industrial Sciences & Technology
University Malaysia Pahang
Lebuhraya Tun Razak, 26300 Gambang, Pahang, Malaysia

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