If you run Matlab on an AMD processor, you aren't getting all the performance you're entitled to. Matlab refuses to execute certain code on AMD CPUs, even when those CPUs support the code in question.

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Launch matlab as an X Windows application from the PuTTy command line. For example, type matlab at the PuTTy command prompt. A matlab window should appear on your local desktop. How to access Matlab ...

This is a Matlab surface 3-D plot of a two-dimensional unnormalized sinc function (obviously!). We got it from Wikipedia.