[R] Unable to make plots using ggplot2

[Rui Barradas]

Hello,

Your error is that you are not plotting the values in your file
See what is in df, it's one column only with 3 character strings, 
c("Young_Control", "Young_Treated", "CHG_methylation"). Those *are not* 
the names of columns, they are just strings.

The right way of doing it is to reshape your data from wide format to 
long format first. I will reformat with tidyr::pivot_longer and pipe the 
result directly to ggplot.

Also, given the large difference in the values plotted, I suggest you 
comment out the code line with "log10", it will plot the y axis in the 
logarithmic scale.


library(tidyverse)
library(ggplot2)

df1 %>%
   pivot_longer(
     cols = c("Young_Control", "Young_Treated"),
     names_to = "Treatment",
     values_to = "Value"
   ) %>%
   ggplot(aes(x = CHG_methylation, y = Value, fill = Treatment)) +
   geom_col(position = position_dodge(0.9)) +
   #scale_y_continuous(trans = "log10") +
   theme(axis.text.x = element_text(angle = 60, vjust = 1))


Hope this helps,

Rui Barradas


Às 22:01 de 16/02/20, pooja sinha escreveu:
> Hi All,
> 
> I have data in excel with the following details:
> CHG_methylation Young_Control Young_Treated
> 0-10% 95.23 94.53
> 10-20% 3.71 4.16
> 20-30% 0.68 0.8
> 30-40% 0.18 0.22
> 40-50% 0.07 0.09
> 50-60% 0.04 0.06
> 60-70% 0.02 0.04
> 70-80% 0.02 0.03
> 80-90% 0.02 0.03
> 90-100% 0.04 0.05
> I am trying to plot the graph using ggplot2 but not successful yet. My code
> is below:
> 
> library(readxl)
> library(dplyr)
> library(tidyverse)
> data2 <- read_excel("CHG_meth_plot1.xlsx")
> df <- data2
> df <- data.frame(var=c("Young_Control", "Young_Treated", "CHG_methylation"))
> df
> 
> ggplot(data = df, aes(x = var, y = CHG_methylation)) +
>    geom_bar(aes(fill = CHG_methylation))
> 
> I am getting error as something is wrong with my df. Also I needed to
> create breaks in y-axis as I do not know whether it is possible in R or
> not.
> Any kind of help is highly appreciated.
> 
> Thanks,
> Puja
> 
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> 
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