Hello Michael,
You were absolutely right, it was not the database mtcars I wanted to
use. but the example you sent me helped me a lot.
I took the code that I adapted to this and what I wanted and resulted in
perfection.
Thank you for your help.
dataset
*with (dataset, plot (dataset $ Na, K $ dataset, $ col = dataset Drug, type
= "p", pch = 20))
with # (dataset, legend ("top", legend = unique (Drug), pch = unique
(dataset $ Drug)))
with (dataset, legend ("bottom", legend = unique (dataset $ Drug), pch =
20, col =
unique (dataset $ Drug)))*
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