Created
January 11, 2015 01:49
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creates the 'png' image (The 'Base64.Encoder' class is in Java 1.8)
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| package rJava; | |
| import java.io.File; | |
| import java.io.IOException; | |
| import java.nio.file.Files; | |
| import java.util.Base64; | |
| import org.rosuda.JRI.Rengine; | |
| public class RSample { | |
| public static void main(String[] args) throws IOException { | |
| Rengine engine = new Rengine(new String[] { | |
| "--no-save" | |
| }, false, null); | |
| try { | |
| int n = 1000; | |
| double[] x = new double[n]; | |
| for (int i = 0; i < n; i++) { | |
| x[i] = 0.0; | |
| for (int j = 0; j < 8; j++) | |
| x[i] += Math.random(); | |
| x[i] = (x[i] - 4.0); | |
| } | |
| File file = File.createTempFile("plot", ".png"); | |
| file.deleteOnExit(); | |
| engine.assign("x", x); | |
| engine.eval("png('" + file.getAbsolutePath() + "')"); | |
| engine.eval("hist(x, xlim=c(-4,4), ylim=c(0,0.6), prob=T, ann=F, panel.first = grid())"); | |
| engine.eval("par(new=T)"); | |
| engine.eval("plot(density(x), xlim=c(-4,4), ylim=c(0,0.6), xlab='' , ylab='' , main='' , col='red' )"); | |
| engine.eval("dev.off()"); | |
| byte[] bytes = Files.readAllBytes(file.toPath()); | |
| String encode = (Base64.getEncoder()).encodeToString(bytes); | |
| String imageSrc = "data:image/png;base64," + encode; | |
| String out = "<html><body><img src=\""; | |
| out += imageSrc; | |
| out += "\"></body></html>"; | |
| System.out.println(out); | |
| } finally { | |
| engine.end(); | |
| } | |
| } | |
| } |
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