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Alex Rivera
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I've been getting up to speed with R in the last month. Here is my question: What is a good way to assign colors to categorical variables in ggplot2 that have stable mapping? I need consistent colors across a set of graphs that have different subsets and different number of categorical variables. For example, plot1 <- ggplot(data, aes(xData, yData,color=categoricaldData)) + geom_line() where categoricalData has 5 levels. And then plot2 <- ggplot(data.subset, aes(xData.subset, yData.subset, color=categoricaldData.subset)) + geom_line() where categoricalData.subset has 3 levels. However, a particular level that is in both sets will end up with a different color, which makes it harder to read the graphs together. Do I need to create a vector of colors in the data frame? Or is there another way to assigns specific colors to categories?
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