[R] Plot table of counts

Greg Snow Greg.Snow at imail.org
Sat Oct 18 18:12:27 CEST 2008

The image function will plot a rectangle for each cell of a table with the color of the rectangle determined by the value of the rectangle.  Any cells in the table that are NA will not produce a rectangle in the image plot.

Can you make that work for your plot?

Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of pofigster at gmail.com
> Sent: Friday, October 17, 2008 10:44 PM
> To: R-help at r-project.org
> Subject: [R] Plot table of counts
> I have a data set which is comprised of counts, that is, the number of
> times a mass spectrometer measured a particular mass at a particular
> time (the rows and columns of the table).  Is there a way to make a
> plot so that it draws a square at the mass/time spot on the graphic if
> there is a count and leave it empty if it's empty?
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