Plotting two barplots together in R (ggplot2)

Question

I want to do a barplot of this dataset

           df <- data.frame(Modelos=c("Model 1", "Model 2"),            
          MSE_test=c(123293931,23231231),MSE_train=c(100001,2292894))

I want to do a barplot of this to compare the values of each model in train and test. I think on that code but this doesn't do what I want.

           ggplot(df, aes(x=Modelos,y=MSE_test, fill = MSE_train)) + 
          geom_bar(position = "dodge")

I want each Model in the x axis and for each model one bar to test and the other to train. I hope to be clear.

Pete · Accepted Answer · 2017-11-21 20:03:12Z

1

You need to reshape the data first with reshape2 or tidyverse packages:

library(reshape2)

df <- df %>% 
    melt(id = "Modelos")

or

library(tidyverse)

df <- df %>%
    gather(variable, value, - Modelos)

then plot:

 ggplot(df, aes(Modelos, value)) + 
    geom_bar(aes(fill = variable),stat = "identity", position = "dodge") +
    scale_y_log10()

answered Nov 21, 2017 at 19:38

Pete

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