Thank you for your suggestions - image() produced a plot that worked, I'll
be trying out all these other options as well.

-----------------------------------------
Mark Ewing


On Sun, Oct 19, 2008 at 4:03 AM, Jim Lemon <jim@bitwrit.com.au> wrote:

> pofigster@gmail.com wrote:
>
>> 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?
>>
>>
>>
> Hi pofigster,
> You can do this with color2D.matplot in the latest version of plotrix
> (2.4-8) that has just been uploaded (may take a day or two to appear):
>
> color2D.matplot(mydata,1,0,1)
>
> will produce a plot with purple rectangles at each number and white
> (default, you can change it) rectangles where there are NAs.
>
> Jim
>
>

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