How to use ggplot2 to draw a stem plot?

[Kjnmy]

Ask a question: how to use ggplot2 to draw stem- leaf graph like 'stem' function of MATLAB ?
The effect is shown in the following figure：

[Axeman]

Easiest is probably geom_col. For the above, the mapping would just be aes(year, SPEI)

Or you could e.g. use geom_segment, with something like aes(x = year, y = 0, xend = year, yend = year). If you combine with geom_point you get something more like the examples here: Plot discrete sequence data - MATLAB stem, which we also call a lollipop chart.

[M_AcostaCH]

@Kjnmy

'stem' function of MATLAB

Remember put and reproducible example for better help you.

# If data frame is data

dput( data[1:30, ]) # for select the 30 first rows and all the columns

FAQ: What's a reproducible example (`reprex`) and how do I create one?

Why reprex? Getting unstuck is hard. Your first step here is usually to create a reprex, or reproducible example. The goal of a reprex is to package your code, and information about your problem so that others can run it and feel your pain. Then, hopefully, folks can more easily provide a solution. What's in a Reproducible Example? Parts of a reproducible example: background information - Describe what you are trying to do. What have you already done? complete set up - include any library() calls and data to reproduce your issue. data for a reprex: Here's a discussion on setting up data for a reprex make it run - include the minimal code required to reproduce your error on the data…