R; replace variable with contents of the variable

Question

How can I replace the variable by its content/value? See sample code below.

###########SET my plotting variable##########################
    plot_var_y<-'var1'
    plot_var_x<-'var2'
####################EVALUATE THE FOLLOWING##################
        temp$plot_var_y
        # The above expression evaluates to null which is not what I want.temp$var1 is what I was looking for

    plot1<-ggplot(aes(y = plot_var_y, x = as.factor(plot_var_x), fill = no_of_heads), data =temp) +
      geom_boxplot()+stat_summary(fun.y=mean, geom="line",aes(group=1),colour=I("red"))+stat_summary(fun.y=mean, geom="point",shape=18,size=3)+xlab("position")

Eventually temp[[plot_var_y]]

jogo
– jogo

2017-12-12 09:05:39 +00:00
Commented Dec 12, 2017 at 9:05 — jogo
– jogo, Commented Dec 12, 2017 at 9:05
Thanks. How about inside ggplot function?

Ravishankar Shivarama
– Ravishankar Shivarama

2017-12-12 09:47:26 +00:00
Commented Dec 12, 2017 at 9:47 — Ravishankar Shivarama
– Ravishankar Shivarama, Commented Dec 12, 2017 at 9:47

axiom · Accepted Answer · 2017-12-12 15:35:38Z

1

Use aes_string instead of aes

try

 plot1<-ggplot(aes_string(y = plot_var_y, x = as.factor(plot_var_x), fill = no_of_heads), data =temp) +
      geom_boxplot()+stat_summary(fun.y=mean, geom="line",aes(group=1),colour=I("red"))+stat_summary(fun.y=mean, geom="point",shape=18,size=3)+xlab("position")

See How to use a variable to specify column name in ggplot

edited Dec 12, 2017 at 15:35

answered Dec 12, 2017 at 10:05

axiom

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