charts - Barplot with multiple columns in R

Question

New to R and trying to figure out the barplot.
I am trying to create a barplot in R that displays data from 2 columns that are grouped by a third column.

DataFrame Name: SprintTotalHours

Columns with data:

OriginalEstimate,TimeSpent,Sprint
178,471.5,16.6.1
210,226,16.6.2
240,195,16.6.3

I want a barplot that shows the OriginalEstimate next to the TimeSpent for each sprint. I tried this but I am not getting what I want:

colours = c("red","blue")

barplot(as.matrix(SprintTotalHours),main='Hours By Sprint',ylab='Hours', xlab='Sprint' ,beside = TRUE, col=colours)

abline(h=200)

I would like to use base graphics but if it can't be done then I am not opposed to installing a package if necessary.

Answer 1

Using base R :

DF  <- read.csv(text=
"OriginalEstimate,TimeSpent,Sprint
178,471.5,16.6.1
210,226,16.6.2
240,195,16.6.3")

# prepare the matrix for barplot
# note that we exclude the 3rd column and we transpose the data
mx <- t(as.matrix(DF[-3]))
colnames(mx) <- DF$Sprint

colours = c("red","blue")
# note the use of ylim to give 30% space for the legend
barplot(mx,main='Hours By Sprint',ylab='Hours', xlab='Sprint',beside = TRUE, 
        col=colours, ylim=c(0,max(mx)*1.3))
# to add a box around the plot
box()

# add a legend
legend('topright',fill=colours,legend=c('OriginalEstimate','TimeSpent'))