When I type "isoMDS()" in the R environment, a error shows up: no such
function "isoMDS". Why? And what should I do to use isoMDS? Additionally, I
cannot install add-on packages. Typing "Rcmd.exe INSTALL e:/VR_7.2-44.zip"
results in "'perl' is neither command nor executable file...". Why this
happens?Thanks.
The setup file I downloaded is R-2.7.2-win32.exe. After double click and
installation, I did nothing more.

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