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| '''[[R programming language|R]]''' is both a programming language, and a software environment for statistical computing.
| | {{welcome and expand}} |
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| == Loading and plotting data with R ==
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| This tutorial demonstrates how to plot data loaded from files in R.
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| * Given the data file ''data.txt'' located at ''<path>'':
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| 1970 45 63
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| 1980 52 59
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| 1990 59 52
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| 2000 63 45
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| * This data can easilty be loaded into R using the following commands:
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| setwd("<path>") # change working directory
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| data = read.table("data.txt") # load data
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| * Plotting can then be performed as follows:
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| # Setup empty plot window
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| plot(0, type = "n", main = "Plot Title", xlab = "X axis", ylab = "Y axis", xlim = c(1970,2000), ylim = c(0,100))
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| grid() # add grid
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| lines(data[,1], data[,2], lty = 1) # draw first dataset
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| lines(data[,1], data[,3], lty = 2) # draw second dataset
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| legend("topright", c("first dataset", "second dataset"), lty = c(1, 2) )
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| * Export of the plot to ''pdf'' is easilty performed by adding ''pdf("filename.pdf")'' prior to the plotting, and ''dev.off()'' after the plotting.
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| * Export to ''png'' can simmilarly be performed by calling ''png("filename.png")'' prior to the plotting, and ''dev.off()'' after the plotting. ''png("r_plot.png", width = 420, height = 340)'' will, for example yield the following figure:
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| [[Image:R_plot.png]]
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| {{stub}} | |
| [[Category:Programming]] | | [[Category:Programming]] |
| | [[Category:Pages moved from Wikibooks]] |
| | [[Category:How to use R]] |
