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    <p>Looking at <code>page(twoord.plot)</code> we see that in <code>twoord.plot</code> when <code>plot</code> is called, argument <code>axes</code> is -already- set to <code>FALSE</code> and axes are built by calling <code>axis</code>. So, <code>xaxt</code> won't have any effect.</p> <p>The thing is, though, that in the code is written: <code>axis(1, ... **cex** = axilsab.cex</code>. But setting <code>cex</code> in <code>axis</code> won't have the desired effect; <code>cex.axis</code> should be used instead. For axes 2 and 4, though, <code>axilslab.cex</code> argument is used by calling <code>mtext</code>. E.g. <code>mtext(axat, 2... cex = axislab.cex</code>; here <code>cex</code> (inside <code>mtext</code>) has the desired effect.</p> <p>Concluding, you can write a function <code>twoord.plot2</code> where you change the <code>cex</code> argument to <code>cex.axis</code> when calling <code>axis(1...</code>. And then run your code by calling <code>twoord.plot2</code>. I.e. <code>axis(1,... **cex.axis** = axislab.cex)</code>.</p> <p><strong>EDIT</strong></p> <p>I will add a <code>x_axislab.cex</code> argument in the original <code>twoord.plot</code> in order to change <strong>only</strong> the size of x-axis' tickmarks:</p> <p>Copy-paste everything from <code>page(twoord.plot)</code> in a text editor and name it <code>twoord.plot2</code>. Then add an extra argument and change the body of the function:</p> <pre><code>twoord.plot2 &lt;- #function (lx, ly, rx, ry, data = NULL, xlim = NULL, lylim = NULL, #rylim = NULL, mar = c(5, 4, 4, 4), lcol = 1, rcol = 2, xlab = "", #ylab = "", rylab = "", lpch = 1, rpch = 2, type = "b", xtickpos = NULL, #xticklab = NULL, halfwidth = 0.4, axislab.cex = 1, **x_axislab.cex = 1**, # do.first = NULL, # ...) #add argument `x_axislab.cex = 1` in the arguments of the original `twoord.plot` #{ # if (!is.null(data)) { # ly &lt;- unlist(data[ly]) #...everything else... #if (is.null(xticklab)) axis(1, **cex.axis = x_axislab.cex**) #change here. it was **cex = axislab.cex** # else { #if (is.null(xtickpos)) #xtickpos &lt;- 1:length(xticklab) # if (is.null(xticklab)) # xticklab &lt;- xtickpos axis(1, at = xtickpos, labels = xticklab, **cex.axis = x_axislab.cex**) #change here. it was **cex = axislab.cex** #.....everything else... </code></pre> <p>Then copy-paste your function in <code>R</code> and run something like:</p> <pre><code>twoord.plot2(...other arguments..., x_axislab.cex = 0.8) </code></pre> <p>to plot your data and change the size of x-axis' tickmarks.</p>
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    1. POHow to modify the size of the x axis text in a twoord plot from the plotrix package?
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    1. USalexis_laz
    1. USalexis_laz
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    1. COAlexis would it be possible for you to supply with some R code for this? I have not yet reached that stage where I am able to write my own R functions. Thanks!
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      1. USRidhima
    2. CO@Ridhima: I, just, updated my answer.
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    3. COThanks Alexis, that worked. How can I get a tick mark to be displayed for each value?Currently only the odd numbers are displayed and also how can I get the labels to be loacted nearer to the tick marks?
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