remove legend title in ggplot

Question

I m trying to remove the title of a legend in ggplot2   df  lt - data frame    g   rep letters 1 2   5     x   rnorm 10     y   rnorm 10     library ggplot2  ggplot df  aes x  y  colour g       geom line stat  identity        theme legend position  bottom       I ve seen this question and none of the solutions there seem to work for me  Most give an error about how opts is deprecated and to use theme instead  I ve also tried various versions of theme legend title NULL   theme legend title      theme legend title element blank   etc  Typical error messages are     opts  is deprecated  Use  theme  instead   Deprecated  last used in version 0 9 1   theme blank  is deprecated  Use  element blank  instead   Deprecated  last used in version 0 9 1    I m using ggplot2 for the first time since version 0 9 3 was released and I m finding it difficult to navigate some of the changes

User · Answer

This works too and also demonstrates how to change the legend title   ggplot df  aes x  y  colour g       geom line stat  identity        theme legend position  bottom       scale color discrete name

User · Answer

Another option using labs and setting colour to NULL   ggplot df  aes x  y  colour   g       geom line stat    identity       theme legend position    bottom       labs colour   NULL

User · Answer

Since you may have more than one legends in a plot  a way to selectively remove just one of the titles without leaving an empty space is to set the name argument of the scale  function to NULL  i e   scale fill discrete name   NULL    kudos to  pascal for a comment on another thread

User · Answer

You were almost there   just add theme legend title element blank     ggplot df  aes x  y  colour g       geom line stat  identity        theme legend position  bottom       theme legend title element blank      This page on Cookbook for R gives plenty of details on how to customize legends

User · Answer

For Error   opts  is deprecated  Use theme   instead   Defunct  last used in version 0 9 1   I replaced opts title    Boxplot - Candidate s Tweet Scores   with labs title    Boxplot - Candidate s Tweet Scores    It worked

[r] remove legend title in ggplot

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