ggplot2: Add coloring to a fix ggplot object












1














I have a fix ggplot object (coming from a nice function that I do not want to touch). However, I would like to add some coloring afterwards, thus add new data. How would that be possible?



Here's a simple example. 



gg <- ggplot(iris, aes(Sepal.Length, Sepal.Width)) + geom_point()


Now, I want object gg to be colored by Petal.Length,e.g. something like (but that's not working)



gg_colored <- gg + aes(col=Petal.Length)


to obtain:



enter image description here






r ggplot2 colors







share|improve this question





























    1














    I have a fix ggplot object (coming from a nice function that I do not want to touch). However, I would like to add some coloring afterwards, thus add new data. How would that be possible?



    Here's a simple example. 



    gg <- ggplot(iris, aes(Sepal.Length, Sepal.Width)) + geom_point()


    Now, I want object gg to be colored by Petal.Length,e.g. something like (but that's not working)



    gg_colored <- gg + aes(col=Petal.Length)


    to obtain:



    enter image description here






    r ggplot2 colors







    share|improve this question



























      1












      1








      1







      I have a fix ggplot object (coming from a nice function that I do not want to touch). However, I would like to add some coloring afterwards, thus add new data. How would that be possible?



      Here's a simple example. 



      gg <- ggplot(iris, aes(Sepal.Length, Sepal.Width)) + geom_point()


      Now, I want object gg to be colored by Petal.Length,e.g. something like (but that's not working)



      gg_colored <- gg + aes(col=Petal.Length)


      to obtain:



      enter image description here






      r ggplot2 colors







      share|improve this question















      I have a fix ggplot object (coming from a nice function that I do not want to touch). However, I would like to add some coloring afterwards, thus add new data. How would that be possible?



      Here's a simple example. 



      gg <- ggplot(iris, aes(Sepal.Length, Sepal.Width)) + geom_point()


      Now, I want object gg to be colored by Petal.Length,e.g. something like (but that's not working)



      gg_colored <- gg + aes(col=Petal.Length)


      to obtain:



      enter image description here






      r ggplot2 colors




      r ggplot2 colors






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 14 '18 at 11:19

























      asked Nov 14 '18 at 9:59









      panuffel

      145212




      145212
























          2 Answers
          2






          active

          oldest

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          1














          The solution is to work with the way to handle aesthetics programmatically using aes_string or aes_().



          The plot can be equally generated with



          data(iris)
          
gg <- ggplot(iris, aes(x=Sepal.Length, y=Sepal.Width, col=Petal.Length)) +
          
geom_point()
          
gg


          Or



          data(iris)
          
gg <- ggplot(iris, aes(x=Sepal.Length, y=Sepal.Width))
          
gg_colored <- gg + geom_point(aes_string(col="Petal.Length"))
          
gg_colored





          share|improve this answer























          • Thanks, but that's not what I mean. Please consider gg as a object. I need something like gg + aes(col=Petal.Length)
            – panuffel
            Nov 14 '18 at 11:14












          • Ok, now I got it!
            – paoloeusebi
            Nov 14 '18 at 11:49










          • Oh cool, thanks paoloeusebi :)
            – panuffel
            Nov 14 '18 at 12:41



















          0














          With the help of paoloeusebi's anwer, I also found a way to add a new colouring variable (instead of Petal.Length which is inside of iris)



          mydat <- gg$data 
          
mydat$col <- rep(LETTERS[1:3], each=50) 
          
gg_colored <- gg + geom_point(data=mydat, aes_string(col="col"))





          share|improve this answer





















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            2 Answers
            2






            active

            oldest

            votes








            2 Answers
            2






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            1














            The solution is to work with the way to handle aesthetics programmatically using aes_string or aes_().



            The plot can be equally generated with



            data(iris)
            
gg <- ggplot(iris, aes(x=Sepal.Length, y=Sepal.Width, col=Petal.Length)) +
            
geom_point()
            
gg


            Or



            data(iris)
            
gg <- ggplot(iris, aes(x=Sepal.Length, y=Sepal.Width))
            
gg_colored <- gg + geom_point(aes_string(col="Petal.Length"))
            
gg_colored





            share|improve this answer























            • Thanks, but that's not what I mean. Please consider gg as a object. I need something like gg + aes(col=Petal.Length)
              – panuffel
              Nov 14 '18 at 11:14












            • Ok, now I got it!
              – paoloeusebi
              Nov 14 '18 at 11:49










            • Oh cool, thanks paoloeusebi :)
              – panuffel
              Nov 14 '18 at 12:41
















            1














            The solution is to work with the way to handle aesthetics programmatically using aes_string or aes_().



            The plot can be equally generated with



            data(iris)
            
gg <- ggplot(iris, aes(x=Sepal.Length, y=Sepal.Width, col=Petal.Length)) +
            
geom_point()
            
gg


            Or



            data(iris)
            
gg <- ggplot(iris, aes(x=Sepal.Length, y=Sepal.Width))
            
gg_colored <- gg + geom_point(aes_string(col="Petal.Length"))
            
gg_colored





            share|improve this answer























            • Thanks, but that's not what I mean. Please consider gg as a object. I need something like gg + aes(col=Petal.Length)
              – panuffel
              Nov 14 '18 at 11:14












            • Ok, now I got it!
              – paoloeusebi
              Nov 14 '18 at 11:49










            • Oh cool, thanks paoloeusebi :)
              – panuffel
              Nov 14 '18 at 12:41














            1












            1








            1






            The solution is to work with the way to handle aesthetics programmatically using aes_string or aes_().



            The plot can be equally generated with



            data(iris)
            
gg <- ggplot(iris, aes(x=Sepal.Length, y=Sepal.Width, col=Petal.Length)) +
            
geom_point()
            
gg


            Or



            data(iris)
            
gg <- ggplot(iris, aes(x=Sepal.Length, y=Sepal.Width))
            
gg_colored <- gg + geom_point(aes_string(col="Petal.Length"))
            
gg_colored





            share|improve this answer














            The solution is to work with the way to handle aesthetics programmatically using aes_string or aes_().



            The plot can be equally generated with



            data(iris)
            
gg <- ggplot(iris, aes(x=Sepal.Length, y=Sepal.Width, col=Petal.Length)) +
            
geom_point()
            
gg


            Or



            data(iris)
            
gg <- ggplot(iris, aes(x=Sepal.Length, y=Sepal.Width))
            
gg_colored <- gg + geom_point(aes_string(col="Petal.Length"))
            
gg_colored






            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited Nov 14 '18 at 11:46

























            answered Nov 14 '18 at 10:35









            paoloeusebi

            641413




            641413












            • Thanks, but that's not what I mean. Please consider gg as a object. I need something like gg + aes(col=Petal.Length)
              – panuffel
              Nov 14 '18 at 11:14












            • Ok, now I got it!
              – paoloeusebi
              Nov 14 '18 at 11:49










            • Oh cool, thanks paoloeusebi :)
              – panuffel
              Nov 14 '18 at 12:41


















            • Thanks, but that's not what I mean. Please consider gg as a object. I need something like gg + aes(col=Petal.Length)
              – panuffel
              Nov 14 '18 at 11:14












            • Ok, now I got it!
              – paoloeusebi
              Nov 14 '18 at 11:49










            • Oh cool, thanks paoloeusebi :)
              – panuffel
              Nov 14 '18 at 12:41
















            Thanks, but that's not what I mean. Please consider gg as a object. I need something like gg + aes(col=Petal.Length)
            – panuffel
            Nov 14 '18 at 11:14






            Thanks, but that's not what I mean. Please consider gg as a object. I need something like gg + aes(col=Petal.Length)
            – panuffel
            Nov 14 '18 at 11:14














            Ok, now I got it!
            – paoloeusebi
            Nov 14 '18 at 11:49




            Ok, now I got it!
            – paoloeusebi
            Nov 14 '18 at 11:49












            Oh cool, thanks paoloeusebi :)
            – panuffel
            Nov 14 '18 at 12:41




            Oh cool, thanks paoloeusebi :)
            – panuffel
            Nov 14 '18 at 12:41













            0














            With the help of paoloeusebi's anwer, I also found a way to add a new colouring variable (instead of Petal.Length which is inside of iris)



            mydat <- gg$data 
            
mydat$col <- rep(LETTERS[1:3], each=50) 
            
gg_colored <- gg + geom_point(data=mydat, aes_string(col="col"))





            share|improve this answer


























              0














              With the help of paoloeusebi's anwer, I also found a way to add a new colouring variable (instead of Petal.Length which is inside of iris)



              mydat <- gg$data 
              
mydat$col <- rep(LETTERS[1:3], each=50) 
              
gg_colored <- gg + geom_point(data=mydat, aes_string(col="col"))





              share|improve this answer
























                0












                0








                0






                With the help of paoloeusebi's anwer, I also found a way to add a new colouring variable (instead of Petal.Length which is inside of iris)



                mydat <- gg$data 
                
mydat$col <- rep(LETTERS[1:3], each=50) 
                
gg_colored <- gg + geom_point(data=mydat, aes_string(col="col"))





                share|improve this answer












                With the help of paoloeusebi's anwer, I also found a way to add a new colouring variable (instead of Petal.Length which is inside of iris)



                mydat <- gg$data 
                
mydat$col <- rep(LETTERS[1:3], each=50) 
                
gg_colored <- gg + geom_point(data=mydat, aes_string(col="col"))






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 14 '18 at 12:44









                panuffel

                145212




                145212






























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