CODEWITHSUNDEEP
rggplot2bar-chart
Adam_S
Adam_S

Reputation: 770

Specify location of bar on bar chart R

I have example data below:

> eg_data <- data.frame(period = c("1&2", "1&2","1", "1", "2","2"), size = c("big", "small", "big", "small","big", "small"), trip=c(1000, 250, 600, 100, 400, 150))

I want to make a stacked bar chart, where I have both periods as the first bar, period one as second, and period two as third. This is specified in the data as they are entered, but when I run the ggplot bar command, R decides that period one is a better candidate for first position. 

ggplot() + 
  geom_bar(data = eg_data, aes(y = trip, x = period, fill = size), 
           stat = "identity",position = 'stack')

First, why does R feel the need to display data in a manner other than how I fed it in, and second, how do I correct this IE specify which groupings I want and in what order.

All help is appreciated, thank you.

Upvotes: 2

Views: 138

Answers (1)

akrun
akrun

Reputation: 887901

We can create the column as a factor with levels specified as the unique values of that column. With that, the values are not sorted and would be in the same order as in the order of sequence of occurrence of the first unique value of 'period'

library(tidyverse)
eg_data %>%
   mutate(period = factor(period, levels = unique(period))) %>% 
   ggplot() +
      geom_bar(aes(y = trip, x = period, fill = size),  
            stat="identity",position='stack')

enter image description here

EDIT - solution with baseR would be as follows - 

eg_data$period <- factor(eg_data$period, levels = c("1 & 2", "1", "2"))

Upvotes: 2

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