What does pch stand for

Question

This line of R code

plot(1:3,4:6,pch=7:9)

produces a plot with three points drawn with different symbols. What does pch stand for?

Answer 1

Plot character or pch is the standard argument to set the character that will be plotted in a number of R functions. Explanatory text can be added to a plot in several different forms, including axis labels, titles, legends, or a text added to the plot itself.

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