In R graphics, what is the different between plotting characters (pch) 16 and 19?

Question

I can\'t find any documentation other than mentions of \"filled\" vs \"solid\".

library(graphics)
plot.new()
points(.48, .5, pch=19)
points(.52, .5, pch=16)
         


        

Answer 1

This may help:

Values of pch are stored internally as integers. The interpretation is

NA_integer_: no symbol.

0:18: S-compatible vector symbols.

19:25: further R vector symbols.

26:31: unused (and ignored).

32:127: ASCII characters.

128:255 native characters only in a single-byte locale and for the symbol font. (128:159 are only used on Windows.)

-32 ... Unicode code point (where supported).

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