Frequently Googled Questions

Linux

• Extract (decompress) with a file pattern (wildcard) ref

tar -xf MyTar.tar --wildcards "*.jpg"

ggplot2

• rotate axis label ref

p + 
  theme(axis.text.x = element_text(angle = 90, hjust = 1))

• remove legend title ref

# Remove title for fill legend
p + 
  guides(fill=guide_legend(title=NULL))

# Remove title for all legends
p + 
  theme(legend.title=element_blank())

• legends in multiple columns/rows ref
• A lot of interesting and useful things in this ref
• overriding the alpha value
• customizing the legend text angle
• etc

p + 
  guides(col = guide_legend(nrow = 8))