[R] Color cells of a matrix as in Excel

[Kenneth Frost]

Hi, John-
Sorry if my last email was not clear.  In R I imagine you having two matrices. One with the raw values and one with values scaled or standardized by column. The matrix with the values scaled by column is used to make the heatmap (i.e. color the image) and the matrix with the raw values is then overlaid on the heatmap. The details of the image or heatmap functions escape me as I have not worked with them for several years. Without doing this myself (and without a lot of time to try it out), I cannot speak for its difficulty, although I don't imagine it being too tedious. It is likely that others will have good ideas and I have copied this back to the list to hopefully find out...
Ken       

On 02/14/12, John Nicholas   wrote:
> I can do that for the color ramp (although a bit tedious to do for each new spreadsheet), but then how do I get the actual values printed in the cells?
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> On Tue, Feb 14, 2012 at 2:35 PM, Kenneth Frost <kfrost at wisc.edu <kfrost at wisc.edu>> wrote:
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> > Hi, John-
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> > Would it be possible to scale the values in each column to fall between 0 and 1 (or standardize them) and use a single color ramp?
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> > Ken
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> > On 02/14/12, John Nicholas   wrote:
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> > > All,
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> > > I frequently make spreadsheets in Excel in which I rank values in columns
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> > > by stop-light colors (red is bad, yellow is OK, green is good).
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> > > Image and heatmap expect a matrix in which all the data are in the same
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> > > scale, but I frequently have different scales in different columns. ie.
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> > > Column one runs from 1-10 while column 2 runs from 1-100. I thus need to
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> > > define a separate color ramp for each column. In addition, sometimes the
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> > > smaller numbers are colored green, while sometimes the larger numbers are
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> > > preferred and colored green. I also want to print in each cell the numeric
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> > > value, and I need to show row names. A crude example without the color:
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> > > RowNames        Col1     Col2
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> > > ----------------------------------------------
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> > > Row1                   1          1
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> > > Row2                   5         50
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> > > Row3                  7.5       80
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> > > Row4                  10        99
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> > > ......
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> > > Is there any R package that can do something similar? Can I create a plot
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> > > that is a matrix of rectangles and get color and text that way?
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> > > Any help is greatly appreciated.
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> > > Thanks,
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> > > John
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> > >       [[alternative HTML version deleted]]
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> > > and provide commented, minimal, self-contained, reproducible code.
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