ggplot2r
I have the following graph that I generated using ggplot2 
I had finalPlot as the ggplot object. To add labels I used
finalPlot + stat_bin() + scale_x_continuous('Solution Cost') + scale_y_continuous('Number of Solutions')`
How can I change the orientation of the y axis label to make it appear horizontal and if possible span it across two lines like
Number of
Solutions
Change the last line to
q + theme(axis.text.x = element_text(angle = 90, vjust = 0.5, hjust=1))
By default, the axes are aligned at the center of the text, even when rotated. When you rotate +/- 90 degrees, you usually want it to be aligned at the edge instead:
The image above is from this blog post.
As code in comments does not display nicely, so I am posting this as an answer. You could do something like this and add labels manually with geom_text():
ggplot(data, aes(x, y)) +
geom_bar(stat = 'identity') +
scale_x_continuous(breaks = NA) +
opts(
panel.grid.major = theme_line(size = 0.5, colour = '#1391FF'),
panel.grid.minor = theme_blank(),
panel.background = theme_blank(),
axis.ticks = theme_blank()
)+
geom_text(aes(label = x, y = -.3))
Best Answer
The syntax has changed in recent versions of ggplot2; if you try the above answer, you'll get
These days you should use