Hi, while we are at the plotting stuff:
For the spectral unmixing I really miss some functionality in GRASS which I used in XGOBI [1] in 1998/99 for my master thesis. It had connected plots for - untransformed scatterplot - PCA space - Parallel coordinates See attached screenshot: one could click on a data point and it was highlighted in all the other data spaces, too. In spectral unmixing, the pure endmembers are in the corners of the PCA space, to the direct query to the other spaces was useful, too. And the parallel coordinates plot showed the spectrum in that point. Maybe rather "easy" to implement when carrying over the coordinates as an attribute to find the related data point back in the (un)transformed data cloud. (?) Markus [1] http://www2.research.att.com/areas/stat/xgobi/
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