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POggplot2: Adjust the symbol size in legends
 

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  1. POggplot2: Adjust the symbol size in legends
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    <p>How should I change the size of symbols in legends? I checked the document of <code>theme</code> but found no answer. </p> <p>Here is an example:</p> <pre><code>library(ggplot2);library(grid) set.seed(1000) x &lt;- 1:6 mu &lt;- sin(x) observed &lt;- mu + rnorm(length(x), 0, 0.5*sd(mu)) data &lt;- data.frame( t=rep(x, 2), value=c(mu, observed) - min(mu, observed) + 0.5, class = rep(c("mu", "observed"), each=length(x))) mu &lt;- data$value[1:length(x)] observed &lt;- data$value[1:length(x) + length(x)] mu.min &lt;- mu - 3 * 0.5 * sd(mu) mu.max &lt;- mu + 3 * 0.5 * sd(mu) g &lt;- ggplot(data=data) g &lt;- g + geom_point(aes(x=value, y=t, shape=class, size=24)) + scale_size(guide="none") g &lt;- g + scale_shape(name="", labels=expression(paste(S[u](t), ", the observation at time ", t), paste(mu[u](t), ", the mean of ", tilde(S)[u](t), " "))) stat_function.color &lt;- gray(0.5) g &lt;- g + geom_segment(aes(y=1:6, yend=1:6, x=mu.min, xend=mu.max, linetype="2", alpha = 1), color=stat_function.color) + scale_alpha(guide="none") + scale_linetype(name= "", labels=expression(paste("probability density function (pdf) of ", tilde(S)[u], " at time ", t))) for(i in 1:length(x)) { g &lt;- g + stat_function(fun=function(x, i) { ifelse( x &lt;= mu.max[i] &amp; x &gt;= mu.min[i], dnorm(x, mu[i], sd(mu)) + i, NA) }, color=stat_function.color, args=list(i=i)) } background.color &lt;- gray(0.75) g &lt;- g + theme( axis.text=element_blank(), title=element_text(size=rel(1.5)), legend.text=element_text(size=rel(1.5)), legend.position="top", legend.direction="vertical", # legend.key.size = unit(2, "cm"), panel.background=element_rect(fill=background.color), panel.grid.major=element_line(color=background.color), panel.grid.minor=element_line(color=background.color) ) + coord_flip() plot(g) </code></pre>
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