MATH 6820 Week 4: Two Scales
The website http://data.worldbank.org/indicator/SP.POP.TOTL?cid=GPD_1 gives the population of many countries for many years.
I collect population data for Honduras from 2002 to 2011,and graph the log (base 2) of the population against year. Construct two scales for your graph where the left vertical scale shows the log (base 2) population and the right vertical scale shows the population.
From the graph, we can see that the population in Honduras is keeping growth for the past ten years, from 2002 to 2011. The the unit of measurement on the right vertical scale is in million and the left log population (base 2) is also in million measurement unit. However, it does not look like exponential.
Interesting part in this graph making:
1.The R help gives us par(mar=par()$mar+c(0,0,0,3)), is that equivalent to par(mar=c(5.1,4.1,4.1,5.1))? Why we will use the “+” in this commend?
2. To limited the decimal, I use the command “format(round(2^seq(2.7,3.0,0.05), 2), nsmall = 2)”
3. what is the best way to add tick mark label on every tick mark? I used the following code:
d <- seq(2.70,3.0,by=0.05) plot(Year, log2(Popu), pch=19,ylab="log2(Millions)",yaxt = 'n') axis (2, at= d)
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