[R] Easy help with plots, font size

[gigi1234]

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!

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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