Elizabeth questions

• Sorting data frames by columns in r [duplicate]
• Adding text to a plot axes without removing existing axes labels in r
• Splitting ggplot plot map into 3 frames
• Creating multiple pairs in R
• Filtering out rows in a matrix containing only 0 in R
• Set the scale in ggplot to be 1:1 in r
• Combine columns in matrix having same column name
• Centring legend below two plots in r
• Overlaying clustering results on an ordination
• Removing lines through symbols in legend in r

Elizabeth answers