[GRASS-dev] PCA question

[Hamish]

Hi,

FWIW, it's a known feature that GRASS's i.pca and R's version
give transposed output. It's just cosmetic and the row and column
headers tell you what's what. GRASS lists the principal
components row-wise, R presents them column-wise.

See discussion and GRASS vs. R testing/validation w/Nikos from
c. March 2009. (& trac ticket #430)


See also other open i.pca tickets:
  "i.pca fails to center data prior to analysis"
  http://trac.osgeo.org/grass/ticket/576

  "i.pca: close map before writing out metadata?"
  http://trac.osgeo.org/grass/ticket/511

  "i.pca metadata truncated"
  http://trac.osgeo.org/grass/ticket/1279


Hamish