How to use R/Tutorials/Introduction: Difference between revisions

Latest revision as of 05:40, 11 April 2009

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

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Latest revision as of 05:40, 11 April 2009