[R] heatmap and continuous variable

Hans-Ulrich Klein h.klein at uni-muenster.de
Wed Jun 25 10:19:30 CEST 2008

Gregory Warnes wrote:
> Hello Hans,
> Do you need *both* a categorical *and* a continuous variable, or just a
> continuous variable?
> -Greg
Hello Greg,

I want to visualize survival data above the columns. So my continuous 
variable is follow up time and my categorical variable indicates the 
event. As the event has only two states (death or alive), one probably 
can omit an extra side bar for this variable and represent it by 
different colors within the plot for the follow up time. If it is easier 
to place two annotations above the heat map, that would be fine, too.

Probably the simplest solution is: Just plot numbers (follow up times) 
in red (death) or blue(alive) above the columns. (Analogous to the 
sample names under the columns.) I do not know how to do this.


> On 6/24/08 4:51PM , "Hans-Ulrich Klein" <h.klein at uni-muenster.de> wrote:
>> Dear All,
>> I want to plot a heat map with annotated columns. Both functions heatmap
>> (stats) and heatmap.2 (gplots) can plot a horizontal side bar that can
>> be used to visualize a categorical variable. In addition to a
>> categorical variable, I would like to visualize a continuous variable.
>> This could be done by small bars, a curve or simply numbers above the
>> columns. (The Sample names are already located at the bottom.)
>> Does someone have example code for this or a similar problem? Is this so
>> special that I have to get down to the lattice package?
>> Thank you,
>> Hans-Ulrich

Hans-Ulrich Klein
Department of Medical Informatics and Biomathematics
Westfälische Wilhelms-Universität Münster
Tel.: +49 (0)251 83-58405

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