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Mathematica 7.0

What can be easier, than Mathematica 7.0 ???

But these symmetric matrixes kill me... Learned a lot of functions today how to build diagonal matrix (Append, Prepend, ConstantArray). But the answer was in the SparseArray ;(  Spent 4 hours, looking for the right command... what a shit!!!!
Now it is 3.30 p.m., the program is ready, and I am completely dead...

Today I have a german test. Hope to be not in the first group...I still know a bit in german. Will be at home at 8:30 today, tomorrow, and till Friday ;( it kills me a bit... no relax. But the WE was really fine!