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POPlotting a double y axis when x and y lenghts differ
 

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  1. POPlotting a double y axis when x and y lenghts differ
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    <p>I have two large data sets that I read into R. For simplicity, consider the following:</p> <pre><code>##Data set 1 x = c("2005", "2006", "2007", "2008", "2009", "2010") y = c(1,2,4,6,4,3) ##Data set 2 ##Shorter than D2. Missing 2005 x1 = c( "2006", "2007", "2008", "2009", "2010") y1 = c(20,40,60,50,29) </code></pre> <p>I want to plot both datasets as line plots with a double y axis. Ideally plotting would like this:</p> <pre><code>plot(x, y, type = "o", col = "red") par(new = TRUE) plot(x, y1, type = "o", col = "blue", xaxt = "n", yaxt = "n", xlab = "", ylab = "") axis(4) </code></pre> <p>But of course the <code>x</code> any <code>y1</code> are not the same size so I get an error. I've tried</p> <pre><code>plot(x1, y1, type = "o", col = "blue", xaxt = "n", yaxt = "n", xlab = "", ylab = "") </code></pre> <p>but then <code>y1</code> just gets stretch out to cover the entire length of.</p> <p>In this simple case I could just add a blank row of <code>Y1</code> to cover the missing 2005 data, but it's not a practical solution in my real data. Is there anyway I can tell R to line up the two datasets accordingly?</p> <p>Additionally, I would prefer to use gplots because I love the easy ability to offset my error bars. The code might look something like this </p> <pre><code>SE = c(.20,.40,.60,.50,.29) SE1 = c(.20,.40,.60,.50,.29) offset = .08 plotCI(x = x, y = y, uiw = SE, type = "o",col = "red") par(new = TRUE) plotCI(x = (x1) + offset, y = y1, type = "o", uiw = SE1, col = "blue", xaxt = "n", yaxt = "n", xlab = "", ylab = "") axis(4) </code></pre>
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    1. COA sample graphic would be handy. Do you want the values to scale through the height of the graph maybe just differentiated by colour (matching the axis)? Or, do you want the scale to be the range of all of the values with the low ones very far down and the higher ones farther up?
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    2. COThanks for the reply! I'm a new user so I could not post a pic of what I am hoping to do. But check out http://all-geo.org/highlyallochthonous/2007/09/how-fast-is-the-arctic-melting/. They have a double y axis plot similar to what I was hoping to create. Except in my case one of my plot lines has fewer years worth of data than the other.
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    3. COI'd still be happy to hear what others have to say, but someone else shared the idea of using xlim=range(Data1$Year,Data2$Year) in the second plot command and this seems to fix it very well. Thanks to everyone for their help!
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