[Plplot-general] Simple coloring question

[fred <far...@ya...>]

Hello,

 I'm using the wxWidgets binding of plPlot, wxPlot,
but I think my question is general enough to post
here. I apologize in advance if this question is
obvious.

I have a three data arrays, x[], y[], z[], all of
equal length.  I would like to plot the x, y arrays
against each other using z to color the points.  I
don't think that a contour plot will work here, as the
z[] values are discontinuous and non-linear in x and
y.  For those of you who use R, I am basically trying
to call something like:

plot( x, y, col = z)

In plplot, I tried the following:

for( int i = 0; i < NUM_POINTS; i++ ){
  myPlot->col( z[i] );   
  myPlot->poin( 1, x[i], y[i], 1 );
}

This kind of works, but it is slow and inelegant and
some of the colors don't seem to display properly.
Moreover, a continuous color range along the lines
"Color Map 1" from the documentation would be
preferable.  I think that I may want to use a shade
plot, but it is not well documented, and I only want
to color the individual points.

Advice?  Suggestions?  Thanks in advance.

Fred

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