R code doesn't save plot image

levelplot, plot, png, r

Solution

Well, I'll just write what I wrote in the comments as an answer.

When plotting `lattice` or `ggplot2` plots inside your own loops or functions, you have to explicitly `print` the `lattice`/`ggplot2` plots

Try this:

library(latticeExtra)
png(filename="plot_%02d.png")
for(i in seq(1,5)) {
    x=runif(40)
    y=runif(40)
    z=runif(40)
    # Assign your lattice plot to myPlot
    myPlot <- levelplot(z ~ x + y, panel = panel.levelplot.points, col.regions = rainbow(50))
    print(myPlot)
}
dev.off()

I believe this part of the R FAQs is relevant here: 7.22 Why do lattice/trellis graphics not work?

EDIT:

I changed the `png` code to come before the loop and placed `dev.off()` outside of the loop.

`png(filename="plot_%02d.png")` will save the first plot as `plot_01.png`, the second plot as `plot_02.png`, etc.

Problem

Original source

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