I want to repost part of a question with some clarification. I am not looking for a highly overcomplicated answer. I want to take the following dataframe in r.

df <- data.frame(nucleotide = c("A", "C", "G", "T"), first.exon = c(18, 28, 33, 21), internal.exon = c(25, 28, 26, 21), last.exon = c(26, 22, 23, 29)) # Print dataframe

nucleotide first.exon internal.exon last.exon 1 A 18 25 26 2 C 28 28 22 3 G 33 26 23 4 T 21 21 29 

Make a grouped barplot where the nucleotides are the groups on the X axis and the three exons are the subgroups on the x-axis. The number of nucleotides in each exon should be the y-axis. in this way we can compare the number of each nucleotide in each exon. A stacked bar graph is not preferable in this case. either base r or ggplot is fine. thanks