**Numerical Methods in Quantum Mechanics**
http://www.fisica.uniud.it/~giannozz/Corsi/MQ/LectureNotes/mq.pdf

needed to add an underscore ( ) in the calling program, as in: dsyev , dgemm . This is due to di erent, and machine-dependent, C-Fortran conventions for the naming of \symbols" (i.e. compiled routines). Note that the C compiler may also need -lm to link general mathematical libraries (i.e. operations like the square root).

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