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A general description is here.
(Windows only) If both 32 and 64 bit versions of R are installed, the ‘bin/R.exe’ and ‘bin/Rscript.exe’ executables now run 64 bit R. (To run 32 bit R, overwrite these files with copies of ‘bin/i386/Rfe.exe’.)
The ‘plot’ method for ‘"hclust"’ objects gets an optional argument ‘check’; When that is true, as per default, it checks more carefully for valid input.
(Windows only) If a user chose to install 64 bit R but not 32 bit R, the ‘bin/R’ and ‘bin/Rscript’ executables failed to run. (PR#15981)
‘merge(<dendrogram>, ..)’ now works correctly for two `independent' dendrograms (PR#15648), and still compatibly via ‘adjust = "auto"’ e.g. for two branches of an existing dendrogram.