[BioC] Adding a text label to the classvec colour bar in heatplot

[Mikhail, Amy]

Dear BioCs,

I'm trying to create a heat plot with a matrix containing real time PCR data for just 5 genes.  There are 105 samples, belonging to 7 groups (groups are in numerical order).  The matrix looks like this (Age is my grouping variable):

                   Gene1        Gene2       Gene3      Gene4       Gene5        Age
A1R_D03  -13.71434 -14.19288 -15.79439 -14.93712 -14.87174   3
A4R_D03  -13.29068 -13.39888 -16.49077 -14.87276 -15.21852   3
A7R_D03  -13.19423 -13.09508 -15.80787 -14.59671 -14.47190   3
A10R_D03 -13.33472 -13.34051 -15.60396 -14.69521 -14.28135   3
A13R_D03 -11.89260 -11.73026 -16.05069 -14.59895 -16.40680   3
A61K_D03 -14.64341 -14.55358 -16.37900 -15.44644 -15.80778   3

...etc

As there are so many samples, it doesn't make sense to have the individual sample names on the graph, so I would like to have the samples in their group order with just the seven group labels.  With heatplot I can get the colourbar for my seven groups using the classvec argument, but can't find any way to label the colourbars with text...

Also, I'm a little confused about the re-ordering that heatplot does - how can I be sure that the samples belonging to a particular group are underneath the appropriate colourbar (and given my situation I would also want the groups to appear in numerical order)?

I have tried using heatmap.2 as well, but it seems only heatplot has the colour bar by group option - heatmap.2 only allows you to add a colourbar representing each column separately?

Here is my code:

#(Ngenet is a transposition of my matrix and the Age variable is in a separate dataframe so that it doesn't appear directly on the plot).

>heatplot(Ngenet, dend="none", cols.default=FALSE, margin=c(7, 7), labCol=FALSE, lowcol="red", highcol="green", scale="none",  classvec=Mop$Age)

If anyone could suggest how I might add the group labels, I'd be very grateful - appologies if this is something very simple, I have actually seen papers with plots showing exactly what I want to do but just can't figure out how to do it.

With best wishes,
Amy

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Amy Mikhail
Research student
Parasite and Vector Biology group
University of Aberdeen
Zoology Building
Tillydrone Avenue
Aberdeen
AB24 2TZ
Scotland
Email: a.mikhail at abdn.ac.uk
Phone: 00-44-1224-273256 (office)


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