[R] ggplot2, geom_point with some symbols unfilled

[Roy Mendelssohn - NOAA Federal]

Hi All:

I have a data frame the first part of which is the following:

         date     lon    lat       mean     chlcol missing
1  2003-04-23 203.899 19.664 0.07300000 0.15176637       0
2  2003-04-24 204.151 19.821        NaN        NaN       1
3  2003-04-30 203.919 20.351 0.07400000 0.15515780       0
4  2003-05-01 204.229 20.305 0.06525000 0.12548281       0
5  2003-05-02 204.082 20.340 0.04028571 0.04081825       0
6  2003-05-03 203.716 20.394 0.08366667 0.18794159       0
7  2003-05-04 204.150 20.346 0.02825000 0.00000000       0
8  2003-05-05 204.385 20.297 0.05566667 0.09298163       0
9  2003-05-07 204.997 20.451        NaN        NaN       1
10 2003-05-08 206.066 20.448 0.06533334 0.12576544       0

or from dput:

> dput(temp)
structure(list(date = structure(c(12165, 12166, 12172, 12173, 
12174, 12175, 12176, 12177, 12179, 12180), class = "Date"), lon = c(203.899, 
204.151, 203.919, 204.229, 204.082, 203.716, 204.15, 204.385, 
204.997, 206.066), lat = c(19.664, 19.821, 20.351, 20.305, 20.34, 
20.394, 20.346, 20.297, 20.451, 20.448), mean = c(0.0729999989271164, 
NaN, 0.0740000000223517, 0.0652500009164214, 0.0402857145028455, 
0.0836666661004225, 0.028249999973923, 0.0556666664779186, NaN, 
0.0653333364365001), chlcol = c(0.151766366071598, NaN, 0.155157797040127, 
0.125482811598769, 0.040818250276168, 0.187941591833751, 0, 0.0929816299987062, 
NaN, 0.1257654379528), missing = c(0, 1, 0, 0, 0, 0, 0, 0, 1, 
0)), .Names = c("date", "lon", "lat", "mean", "chlcol", "missing"
), row.names = c("1", "2", "3", "4", "5", "6", "7", "8", "9", 
"10"), class = "data.frame”)

What I want to do is put a point at each lat-lon location, with the color set by chlcol, except where chlcol is NaN, where I want the point to be a an open circle color black. The variable “missing" is 1 if chlcol is NaN, and zero if not.  So I have tried:

 ggplot(temp,aes(x=lon,y=lat)) + geom_point(aes(colour=chlcol),size=3.,shape=missing) + scale_colour_gradient(low="lightblue", high="red") + scale_shape_manual(values=c(1,21)) + theme_bw() 

This gets real close except the missing circles are black and filled, rather than black and open.  A shape value of 21 is suppose to be an open circle.

Thanks for any help.

-Roy

**********************
"The contents of this message do not reflect any position of the U.S. Government or NOAA."
**********************
Roy Mendelssohn
Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
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Phone: (831)-420-3666
Fax: (831) 420-3980
e-mail: Roy.Mendelssohn at noaa.gov www: http://www.pfeg.noaa.gov/

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