Multiple y axis in r ggplot2. Jul 23, 2025 ยท In this article, we are going to see how to add two vertical axes on either side having different scales using the ggplot2 bar plot in R Programming Language using a suitable example. axis attribute to add the second Y axis. e. It's not possible in ggplot2 because I believe plots with separate y scales (not y-scales that are transformations of each other) are fundamentally flawed. We can achieve this by creating a new scale for the right side of the chart using scale_y_continuous with an appropriate limits parameter. Example: Drawing ggplot2 Plot with Two Y-Axes Using sec_axis () Function In this Example, I’ll show how to print a ggplot2 graphic that has two y-axes with different scales on each side of the plot. Align multiple ggplot2 graphs with a common x axis and different y axes, each with different y-axis labels. Although ggplot doesn't allow creating a separate independent y-axis, it does allow creating a second y axis that is a one-to-one transformation of the first. Some problems: They are not invertible: given a point on the plot space, you can not uniquely map it back to a point in the data space. I've searched everywhere and I know that the designers aren't too fond of making graphs this way so it's tough, but I have seen it done with multiple line graphs/scatter plots using two y axis. maxk u3sdlsk qwkr w3 tvka 65uov qqicb j3rz6xq lc lxwb8