Elizabeth questions

• 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
• Creating a legend for a dendrogram with coloured leaves in r
• Filtering a data frame by factors in R
• Replacing columns names using a data frame in r
• Outputting a textplot and qplot in same pdf or png in r

Elizabeth answers