[Gnuplot-info] point type depending on data column

[seb_kramm <seb...@ya...>]

Hello,

When plotting points from a datafile, gnuplot offers me the ability to change the 
color of the point depending of some column:
plot "datafile" using 1:2:3 with points palette

I can also have the size of the point depend on a column of data:
plot "datafile" using 1:2:3 with points ps variable

Now, I want to have the type of the point depend on a column of data. Assuming of 
course that this column has values lying in the range
[0-nb of point types that the terminal has]

How can I do this ? This:
plot "datafile" using 1:2:3 with points pt variable
does not work, neither does this:
plot "datafile" using 1:2 with points pt $3

Any idea ?