Hello everyone, I have the following data frame which consists of visual / sightings per hour (SPH) and acoustic / clicks per hour (CPH) data sets for a time span of 8 weeks. I'd like to to have a grouped bar plot which groups the two values for one week together. So e.g. it's 2.676 sightings/h in week 1 and 75.35 clicks/h in week 1. Because of the different units for both variables I also need two y-axes, one for sightings/h on the left and one for clicks/h on the right.

I tried to create a matrix to plot the data, but I don't know how to tell R properly that the first two variables belong to week 1, the second two to week 2 etc.