[R] Newbie: how to get unique x unique x aggregate chart?

[Jeffrey Robert Spies]

I'm not sure I understand the question, but you might look into the  
following functions:

unique
heatmap
image

Again, if I understand the question, you would create a length(unique 
(x)) by length(unique(y)) sized matrix, and fill it with appropriate  
values of z.  Then pass that to heatmap or image.

Hope that helps--feel free to tell me if I've answered  the wrong  
question,

Jeff.

On Nov 15, 2006, at 8:30 AM, Christian Convey wrote:

> I'm very new to R, so please forgive me if I just missed the answer in
> existing documentation...
>
> I have a data set with at least three columns, X, Y, and Z.
>
> I want to produce a chart where one axis shows all the unique  
> values of X,
> and the other axis shows all the unique values of Y.  Each cell  
> within the
> chart should contain the result of applying an aggregate function  
> (such as
> mean(), for example) to Z value of those rows that are associated  
> with that
> cell (via their X and Y values).
>
> Can someone recommend a good way to do this?
>
> Thanks very much,
> Christian
>
> 	[[alternative HTML version deleted]]
>
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