plot count histogram in R ggplot

Question

I need help with this please. I have searched here but not got the right output.

I am trying to plot this in R, so I can plot 3 files side-by-side in a single plot using GGplot. The output I desire (plotted with excel) is this

What i am getting using GGplot is this

The R code i am using is this

A1 <- read.table("A1.txt", header = T, sep = "\t")
library(ggplot2)
ggplot(A1, aes(x = count)) + geom_bar()

The data is a tab-delimited file like this

length  count
26  344776
27  289439
18  673395
28  338146
19  710702
20  928326
21  3491352
22  2724981
23  699007
24  726121
25  472509

The length, as it were will only be labels on the x axis for the counts plotted on the y-axis.

You don't need a histogram. You need a bar plot. Try a bar plot with length as x axis and count as y axis — Rohit
– Rohit, Commented Jun 12, 2018 at 10:43

ozgeneral · Accepted Answer · 2018-06-12 12:39:58Z

5

Is this what you wanted?

ggplot(A1, aes(x = as.character(length), y=count)) + geom_bar(stat="identity")

edited Jun 12, 2018 at 12:39

answered Jun 12, 2018 at 10:46

ozgeneral

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6 Comments

CEPHAS Over a year ago

Thanks a lot. This works great. How can I make the labels on the x-axis correspond to each bar...like 18 19 20 21 etc. What i have now is 17.5 20.0 22.5 25.0 27.5

CEPHAS Over a year ago

(stat="identity") appears to be the main difference to the code I wrote earlier. what is the meaning of this please?

ozgeneral Over a year ago

if you dont use stat it would calculate the counts automatically. when you say stat="identity" you are basically saying 'dont count number of times you see 18 in lengths but take the count column as that value instead'

ozgeneral Over a year ago

the labels are dependent on your length column. it should show exactly the same values. if you want integers you can use round

ozgeneral Over a year ago

also you should mark this as answer if this was what you are looking for

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