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]] > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting- > guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.