You may try scilab (which is a clone of matlab written by INRIA) for plotting graphics and so on.
But if you are looking for some scientific application, please don't forget to consult SAL (http://SAL.KachinaTech.COM/index.shtml) it has a good summary of linux scientific applications. Paulo. -- Paulo José da Silva e Silva <[EMAIL PROTECTED]> Ph.D. Student in Applied Math. University of São Paulo - Brazil http://www.ime.usp.br/~rsilva "May the code be with you" :-)