osme | Open Sheet Music Education : A configurable generator | Learning library

The variables that you are passing to ggplot (more specifically geom_point) look to be character vectors. Internally R is converting the character strings into factors before plotting them and the default order of the levels of factors is lexical (the order that you are seeing in the plots).

There is some variety in how different programs deal with ordering in plots. Older programs (from before rich data structures) would consider the ordering to be a property of the plot, so you would specify any ordering as an option to the plot. R has richer data structures and sees ordering as a property of the data rather than the plot (you can specify it once and have it be consistent in all plots, tables, etc. instead of having to repeat the ordering over and over). This means that the best way to get the ordering you want is to modify your data (data frame or tibble) to have the variable(s) of interest be factors with the ordering that you want, then call ggplot on the modified data.

There are a few ways to do this. Since you are using ggplot2, you probably will not mind using other tidyverse packages. A simple approach is to use the str_sort function from the stringr package:

You can split your string from example with shlex.split (docs here), regular expression is not necessary:

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you can do it using flag variable(if your data is in foreach loop)