@SantiagoNuñez-Corrales check the sharpplot class document especially the APL example sharpplot.com/Languages.htm

However recently I find vega.github.io/vega-lite much easier to use since that is declarative

btw if your are not using windows version Dyalog, you are limited to pure-APL workspace version but most of the API is still the same

@Adám thank's for mention TI-BASIC in the podcast, it indeed uses different symbols for substraction and negative.

while the HP RPN calculators does not distinguish them

@SantiagoNuñez-Corrales No and no, but you can use the full SharpPlot for those things.