geom_bar plot with several variables
1
4
Entering edit mode
3.6 years ago

Hi all, I need your help. I am struggling on getting a bar plot with ggplot2 package.

Imagine I have 3 different variables (which would be my y values in aes) that I want to plot for each of my samples (x aes):

 str(df) 
'data.frame':   4 obs. of  4 variables:
 $ samples: Factor w/ 4 levels "S1","S2","S3",..: 1 2 3 4
 $ v1     : int  234 189 167 235
 $ v2     : int  345 265 235 254
 $ v3     : int  54 48 32 645

I would like to have a barplot in which I have a group per sample (4), each of them with 3 bars, one for each variable (12 bars in total). I know that if I want to extract the height from the df I have to call for stat = "identity". So far this has been my guess, but it's not working properly:

n <- ggplot(df) + 
  geom_bar(mapping = aes(x = samples, y = v1), stat = "identity", position = "dodge") + 
  geom_bar(mapping = aes(x = samples, y = v2), stat = "identity", position = "dodge") +
  geom_bar(mapping = aes(x = samples, y = v3), stat = "identity", position = "dodge")

Could you please help me?

Thanks before hand

R ggplot2 • 50k views
ADD COMMENT
0
Entering edit mode

4 observation of 4 variables: I have Type position in more variable (20),how to give minimum variable(5)

ADD REPLY
0
Entering edit mode

Excuse me...?

ADD REPLY
6
Entering edit mode
3.6 years ago

with iris data : 4 observation of 4 variables:

data(iris)
library(ggplot2)
library(tidyr)

iris %>%
  gather("Type", "Value",-Species) %>%
  ggplot(aes(Species, Value, fill = Type)) +
  geom_bar(position = "dodge", stat = "identity") +
  theme_bw()

Rplot

Separate boxes for each species:

iris %>%
  gather("Type", "Value",-Species) %>%
  ggplot(aes(Species, Value, fill = Type)) +
  geom_col(position = "dodge") +
  theme_bw()+
  facet_wrap(~Species,scales = "free_x")

Rplot01

input (for one species, likewise for rest two species):

> head(iris)
  Sepal.Length Sepal.Width Petal.Length Petal.Width Species
1          5.1         3.5          1.4         0.2  setosa
2          4.9         3.0          1.4         0.2  setosa
3          4.7         3.2          1.3         0.2  setosa
4          4.6         3.1          1.5         0.2  setosa
5          5.0         3.6          1.4         0.2  setosa
6          5.4         3.9          1.7         0.4  setosa
ADD COMMENT
0
Entering edit mode

Hi, Wonderful explanations. Thanks! But like to know how to rearrange the variables in the each box. for example, petal.length, sepal.length, petal.width, sepal.width

Also how about display in descending order. Thanks

ADD REPLY
0
Entering edit mode

You can re-order these by converting them to [ordered] factors in the input data.

ADD REPLY
0
Entering edit mode
ADD REPLY

Login before adding your answer.

Traffic: 1517 users visited in the last hour
Help About
FAQ
Access RSS
API
Stats

Use of this site constitutes acceptance of our User Agreement and Privacy Policy.

Powered by the version 2.3.6