[R] Plot table of counts

pofigster at gmail.com pofigster at gmail.com
Sat Oct 18 06:44:02 CEST 2008

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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