all of the variables n, st, st2, st3, st4, st5, st6, sx, sxt, sxt2, and
sxt3 are all floats.
A = array([[N, st, st2, st3],[st, st2, st3, st4], [st2, st3, st4, st5],
[st3, st4, st5, st6]])
B = array ([sx, sxt, sxt2, sxt3])
lina = linalg.solve(A, B)
Is your matrix A in fact singular? Without numerical values of A, st, etc., it is hard to know.
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