Help! Matrix algebra people?

I need help, please, to figure out why my data matrix is not "positive definite."

( The gory details. )

Update - I had misunderstood my advisor. He said that principal components analysis works in this case. He's right; it does. Now I have to re-learn what on earth that is.

Closing the "gay gap" in Iran

By Jon Carroll, San Francisco Chronicle:

Our nation's gay leaders pronounced themselves "surprised" at Iranian President Mahmoud Ahmadinejad's open admission that the long-rumored "gay gap" is real. CIA sources have been saying privately for some time that advanced satellite imaging has revealed traces of gays in the area around Tehran, but other pundits were skeptical. "The idea that gays have a different heat signature is an unproven hypothesis," said spokesperson Leslie Tracy.

Now, in the wake of Ahmadinejad's candid admission, a team of gay proselytizers is being formed in a humanitarian effort to bring Iran up to First World standards. "Never let it be said," said Col. Tracy Leslie of the Revolutionary Gay Army, "that America sat idly by while another nation suffered through a decadeslong gay drought."

( Read more. )

Source.