Re: [R] Easy help with plots, font size

Thu, 03 Feb 2011 18:24:12 -0800 


On Feb 3, 2011, at 7:12 PM, gigi1234 wrote:
I am trying to make some plots for a poster. Each one needs to be 6 inches by inches. Right now the fonts are too small and the plots don't read well on my poster. I am pretty much an R newbie and I can't figure out how to change the fonts. It would also be nice to know how to specify the size of the plot 
and maybe how to save the plots as jpeg files. Any help would be much
appreciated! I am not too picky about the details like font type, I just 
want the size of the fonts (especially the axes and axes labels) to be
bigger!


?par
cex, cex.main, cex.lab, and cex.axis are arguments that should be helpful to control various font sizes. 

?Devices
?jpeg
The device settings are where you can change the plot size. There are examples on the help pages. 




Thanks so much!

Here is my code:

# Poster figure 1

stationmean=c(19.4833,10.8000)
fieldmean=c(14.6852, 15.5981)

plot(c(0,1),fieldmean,xaxt='n',type="b",pch=20,col="green3",
main="Foxtail Seeds Remaining vs.Field Type", ylab="Mean Number Foxtail 
Seeds Remaining",
        xlab="Field Type",ylim=c(10,20),xlim=c(-.25,1.25))
axis(1,at=c(0,1),labels=c("Cover Crop","Wheat Stubble"))

# Poster figure 2

stationmean=c(19.4833,10.8000)
fieldmean=c(14.6852, 15.5981)

plot(c(0,1),stationmean,xaxt='n',type="b",pch=20,col="green3",
main="Foxtail Seeds Remaining vs. Station Type", ylab="Mean Number Foxtail 
Seeds Remaining",
        xlab="Station Type",ylim=c(10,20),xlim=c(-.25,1.25))
axis(1,at=c(0,1),labels=c("Invertebrate Only","Open Access"))

# Poster figure 3

meantime=22.1
meancumrainfall=.4837
meanavelowt=35.4920071
meanavehight=55.3242738
meanvegcover=81.1729167

pred.veg = 33.3160 + -.2439*meantime - .8409*(.5) + 8.6833*(.5) +
        .5427*(meancumrainfall)-.3087*(meanavehight) +
        .01087*(seq(0,164.5,by=5))
pred.veg

plot(seq(0,164.5,by=5),pred.veg,type='l',col='blue',lwd=2,
        main='Foxtail Seeds Remaining vs. Vegetative Cover Biomass',
xlab='Vegetative Cover Biomass (g / 0.25 m^2',
        ylab='Mean Number Foxtail Seeds Remaining',ylim=c(10,22))

# Poster figure 4

meantime=22.1
meancumrainfall=.4837
meanavelowt=35.4920071
meanavehight=55.3242738
meanvegcover=81.1729167

pred.rain = 33.3160 + -0.2439*meantime - .8409*(.5) + 8.6833*(.5) -
        1.0571*(seq(0,1.569,by=.1))-.3087*(meanavehight) +
        .01087*(meanvegcover)
pred.rain

plot(seq(0,1.569,by=.1),pred.rain,type='l',col='blue',lwd=2,
main='Foxtail Seeds Remaining vs. Cumulative Rainfall', xlab='Cumulative 
Rainfall (in)',
        ylab='Mean Number Foxtail Seeds Remaining',ylim=c(10,22))

# Poster figure 5

meantime=22.1
meancumrainfall=.4837
meanavelowt=35.4920071
meanavehight=55.3242738
meanvegcover=81.1729167

pred.high = 33.3160 + -.2439*meantime - .8409*(.5) + 8.6833*(.5) +
        1.0571*(meancumrainfall)-.3087*(seq(37.733,74.38228571,by=1)) +
        .01087*(meanvegcover)
pred.high

plot(seq(37.733,74.38228571,by=1),pred.high,type='l',col='blue',lwd=2,
main='Foxtail Seeds Remaining vs. Average Daily High Temp', xlab='Average 
Daily High Temperature (degrees F)',
        ylab='Mean Number Foxtail Seeds Remaining',ylim=c(10,22))

# Poster figure 6

meantime=25.3333333
meancumrainfall=.4015
meanavelowt=37.9325
meanavehight=62.2579683
meanvegcover=77.6145833
meannumtotseedwt=.8708333

pred.seed = 24.4096 + -.1930*meantime - 3.5233*(.5) + 11.8611*(.5) -
        2.7335*(meancumrainfall)-.1510*(meanavehight) +
        .01286*(meanvegcover) - 3.2848*(seq(.2,1.6,by=.05))
pred.seed

plot(seq(.2,1.6,by=.05),pred.seed,type='l',col='blue',lwd=2,
main='Foxtail Seeds Remaining vs. Ambient Seed Load', xlab='Ambient Seed 
Load (g / 0.25 m^2',
        ylab='Mean Number Foxtail Seeds Remaining',ylim=c(8,16))

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David Winsemius, MD
West Hartford, CT

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and provide commented, minimal, self-contained, reproducible code.

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