[BeetleB]

> If your college background is math, you used Matlab in school.

This is as misinformed as you can get. Matlab is not meant for math - it's meant for computation and the target is science/engineering. Sage likely does a lot that Matlab doesn't do well.

> I've never met anyone who uses Sage and work at large research center.

My company has licenses for MATLAB and Maple. Still, quite a few employees prefer to use Sage over those two.