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Hi everyone,
does anyone knows any library in c for calculating eigenvalues and eigenvectors of large, symmetric, sparse matrices?
Specifically i want the second smallest eigenvalue and the...

is there any function somewhere that i can see which solves linear systems?

the steps are these;
represation,search in matrix,add 2 matrices,multiply 2 matrices, inverse matrice, converse matrice, solve A*x=b. I ll post the code tomorow cause i dont have it in my computer...

i ve done the represetion but i cant think anything about the functions.

Does anyone have something in mind?
I am trying to find functions for addition,multiply and solving A*x=b system for matrices which are represented as linked lists.