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POusing ggplot2 with data.table to produce multiple .pdfs produces all data on each plot
 

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  1. POusing ggplot2 with data.table to produce multiple .pdfs produces all data on each plot
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    <p>I have the same example as before (<a href="https://stackoverflow.com/questions/18165373/interpolation-of-grouped-data-using-data-table">interpolation of grouped data using data.table</a>), but here I am trying to use ggplot2 to create a single .pdf plot for each site_no. Instead of the data for each site_no printed on a single .pdf, all of the data from all of the plots are printed on each site_no named .pdf. Can you assist?</p> <p>Thank you.</p> <p>Irucka</p> <pre><code>library(data.table) library(ggplot2) tempbigdata1 &lt;- data.table(c(14.80, 14.81, 14.82), c(7900, 7920, 7930), c("02437100", "02437100", "02437100")) tempbigdata2 &lt;- data.table(c(9.98, 9.99, 10.00), c(816, 819, 821), c("02446500", "02446500", "02446500")) tempbigdata3 &lt;- data.table(c(75.65, 75.66, 75.67), c(23600, 23700, 23800), c("02467000", "02467000", "02467000")) tempsbigdata &lt;- rbind(tempbigdata1, tempbigdata2, tempbigdata3) setnames(tempsbigdata,c("depth", "discharge", "site_no")) setkey(tempsbigdata, site_no) tempsbigdata depth discharge site_no 1: 14.80 7900 02437100 2: 14.81 7920 02437100 3: 14.82 7930 02437100 4: 9.98 816 02446500 5: 9.99 819 02446500 6: 10.00 821 02446500 7: 75.65 23600 02467000 8: 75.66 23700 02467000 9: 75.67 23800 02467000 ratingsplot &lt;- tempsbigdata[,list(discharge,depth),by=site_no] for (u in unique(ratingsplot$site_no)) {pdf(file = file.path("/plots/", paste0(u, "_rating.pdf", sep = ""))) p &lt;- ggplot(ratingsplot, aes(x = discharge, y = depth, group = site_no)) print(p &lt;- p + geom_point() + theme_bw()) dev.off() } </code></pre>
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    1. COVoting to reopen because I think that the cited page gives exactly the opposite of what was requested. I suppose it is possible that a duplicate exists somewhere but do not see evidence of this at the moment.
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