Adding a legend to a plot

It's pretty easy!

plot (c(1968,2010),c(0,10),type="n", # sets the x and y axes scales

xlab="Year",ylab="Expenditures/GDP (%)") # adds titles to the axes

lines(year,defense,col="red",lwd=2.5) # adds a line for defense expenditures

lines(year,health,col="blue",lwd=2.5) # adds a line for health expenditures

legend(2000,9.5, # places a legend at the appropriate place
c("Health","Defense"), # puts text in the legend

# gives the legend appropriate symbols (lines)

lwd=c(2.5,2.5),col=c("blue","red")) # gives the legend lines the correct color and width


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Selva Prabhakaran said...

Great post! Thank you so much for sharing..

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May 25, 2014 at 11:59 PM

Rkurssi said...

Thank you.
Helped me a lot. Just one question remains:
How do you create custom symbols for lty=c() in case you want to use marks like *,+,o that are measured points in the graphic?

September 23, 2016 at 6:06 AM

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