title: ggplots2 ggsave text size not changing
body: <p>I'm having issues with changing the size of the title, X-Y labels, X-Y axis text for my <code>ggplot2</code>. I'm using <code>ggsave</code> to save the plot as a jpg.</p>
  
  <pre><code>p &lt;- ggplot()
  p + theme(axis.title = element_text(size=30), axis.text.y = element_text(size=30),
            axis.text.x = element_text(size=30))
  </code></pre>
  
  <p>but changing the sizes of these texts doesn't change anything on the plot. Would anyone know how to properly change the text sizes?</p>
  
  <hr>
  
  <p>So I fixed the issue I was having so the changes I make to theme are not affecting the plot (I've tested with changing text color), however the size of the axis text still does not change.</p>
  
  <pre><code>p &lt;- ggplot(d[d$user==i,], aes(x=date, y=url, group=user, label=user)) + geom_line() + geom_point() +
    labs(list(title=i, x="Date and Time", y = "URL")) +   # Plot labels
    axis.POSIXct(1, at=seq(daterange[1], daterange[2], by="hour")) # Set x axis range to first and last date-time in data
  p &lt;- p + modifiedtheme
  ggsave(plot = p, filename = "sample.jpg", height=2, width=6)
  </code></pre>