Hello,
I'm using S-PLUS 4.5, Release 2. I'm trying to figure out the proper
arguments to give to the Bubble Plot dialog box (actually the
Line/Scatter Plot dialog box) in order to make the results consistent
with calling the command line function symbols() and using the circles
argument.
Consider the following (with apologies to Bill Nye the Science Guy):
x <- c(0:10, 5, 5)
y <- c(0:10, 5, 4 + sqrt(2))
z <- c(rep(0,11), 1, 2)
plot(x, y, type = "n")
symbols(x, y, circles = sqrt(z), add=T)
This yields a plot with two circles, one of which is supposed to be
twice as large in area as the other, although I'm not quite sure why
they don't share the point (4,4).
When I create a "bubble plot" by using the pull-down menu or 2D Graph
palette, I put x in the "x Column(s)" box, y in the "y Column(s)" box,
but I'm not sure whether I'm supposed to put z or sqrt(z) in the "z
Column(s)" box (the help file gives no information on this point).
Either way, the resulting plot shows bubbles for the points where z
has values of 0, so there is an inconsistency between the way a bubble
plot works and the symbols() function.
Can someone help me figure out what I'm supposed to put in the "z
Column(s)" box and whether bubble plot is really plotting circles in
the correct way (i.e., the *area* of the circle is proportional to what
you put in the "z Column(s)" box)?
Thanks so much for your time and help!
Sincerely,
--Steve M.
_____________
| *** | Steven P. Millard, Ph.D.
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| * * * | P robability, TEL: 206-528-4877
| * * * | S tatistics & FAX: 206-528-4802
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