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POChange the number of tick marks on a figure in R
 

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  1. POChange the number of tick marks on a figure in R
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    <p>I created a figure of two plots (two years) of climate data (temp and precip) that looks exactly like I want it, except that one of my axes has too many tick marks. With everything I have going on with this figure, I can't find a way to specify fewer tick marks without messing up other parts. I would also like to specify where the tick marks are. Here is the figure: <img src="https://i.imgur.com/XyVeWlh.png" alt="Climate"></p> <p>You can see that the tick marks for the top axis just blur together and the numbers chosen are not very meaningful to me. How can I tell R what I really want?</p> <p>Here are the datasets I am using: <a href="https://www.dropbox.com/s/ysoiut7ma5y8q30/cobs10.txt" rel="nofollow noreferrer">cobs10</a> and <a href="https://www.dropbox.com/sh/phonq4ssjv5dnb0/7iLelar0pR" rel="nofollow noreferrer">cobs11</a>.</p> <p>And here is my code:</p> <pre><code>par(mfrow=c(2,1)) par(mar = c(5,4,4,4) + 0.3) plot(cobs10$day, cobs10$temp, type="l", col="red", yaxt="n", xlab="", ylab="", ylim=c(-25, 30)) axis(side=3, col="black", at=cobs10$day, labels=cobs10$gdd) at = axTicks(3) mtext("Thermal Units", side=3, las=0, line = 3) axis(side=2, col='red', labels=FALSE) at= axTicks(2) mtext(side=2, text= at, at = at, col = "red", line = 1, las=0) mtext("Temperature (C)", side=2, las=0, line=3) par(new=TRUE) plot(cobs10$gdd, cobs10$precip, type="h", col="blue", yaxt="n", xaxt="n", ylab="", xlab="") axis(side=4, col='blue', labels=FALSE) at = axTicks(4) mtext(side = 4, text = at, at = at, col = "blue", line = 1,las=0) mtext("Precipitation (cm)", side=4, las=0, line = 3) par(mar = c(5,4,4,4) + 0.3) plot(cobs11$day, cobs11$temp, type="l", col="red", yaxt="n", xlab="Day of Year", ylab="", ylim=c(-25, 30)) axis(side=3, col="black", at=cobs11$day, labels=cobs11$gdd) at = axTicks(3) mtext("", side=3, las=0, line = 3) axis(side=2, col='red', labels=FALSE) at= axTicks(2) mtext(side=2, text= at, at = at, col = "red", line = 1, las=0) mtext("Temperature (C)", side=2, las=0, line=3) par(new=TRUE) plot(cobs11$gdd, cobs11$precip, type="h", col="blue", yaxt="n", xaxt="n", ylab="", xlab="", ylim=c(0,12)) axis(side=4, col='blue', labels=FALSE) at = axTicks(4) mtext(side = 4, text = at, at = at, col = "blue", line = 1,las=0) mtext("Precipitation (cm)", side=4, las=0, line = 3) </code></pre> <p>Thanks for thinking about it.</p>
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