Hi, I calculated the eigenvalues from a matrix A and of her transposed matrix A^t. In the first case i got complex eigenvalues and in the second real eigenvalues. But i would expect that both have the same eigenvalues, because det(A-s*Id)=det((A-s*Id)^t)=det(A^t -s*Id). I added my program with my data file. The program is written in C. For calling the programm from a console if the data file 100eV513.txt and the programm in the same folder: ./Eig.x 100eV513.txt non // for the calculation of the eigvalues and ./Eig.x 100eV513.txt trans // for calulating the eigvalues of the transposed matrix gcc -Wall -g -llapack -lblas -lgfortran qss_main.c read_data.c Hom_DGL_Solver.c -o Eig.x Did I make a mistake or lapack ? Greetings Mike -------------- next part -------------- A non-text attachment was scrubbed... Name: A.tex Type: text/x-tex Size: 25279 bytes Desc: not available Url : http://lists.eecs.utk.edu/mailman/private/lapack/attachments/20100728/3871cc3c/A-0001.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: Atrans.tex Type: text/x-tex Size: 25775 bytes Desc: not available Url : http://lists.eecs.utk.edu/mailman/private/lapack/attachments/20100728/3871cc3c/Atrans-0001.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: Eig.x Type: application/octet-stream Size: 79868 bytes Desc: not available Url : http://lists.eecs.utk.edu/mailman/private/lapack/attachments/20100728/3871cc3c/Eig-0001.obj -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: 100eV513.txt Url: http://lists.eecs.utk.edu/mailman/private/lapack/attachments/20100728/3871cc3c/100eV513-0001.txt -------------- next part -------------- A non-text attachment was scrubbed... Name: Hom_DGL_Solver.c Type: text/x-c++src Size: 6102 bytes Desc: not available Url : http://lists.eecs.utk.edu/mailman/private/lapack/attachments/20100728/3871cc3c/Hom_DGL_Solver-0002.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: Hom_DGL_Solver.h Type: text/x-chdr Size: 487 bytes Desc: not available Url : http://lists.eecs.utk.edu/mailman/private/lapack/attachments/20100728/3871cc3c/Hom_DGL_Solver-0003.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: complex_funktion.h Type: text/x-chdr Size: 579 bytes Desc: not available Url : http://lists.eecs.utk.edu/mailman/private/lapack/attachments/20100728/3871cc3c/complex_funktion-0001.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: lapack.h Type: text/x-chdr Size: 1016 bytes Desc: not available Url : http://lists.eecs.utk.edu/mailman/private/lapack/attachments/20100728/3871cc3c/lapack-0001.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: matrix.h Type: text/x-chdr Size: 147 bytes Desc: not available Url : http://lists.eecs.utk.edu/mailman/private/lapack/attachments/20100728/3871cc3c/matrix-0001.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: qss_main.c Type: text/x-c++src Size: 1165 bytes Desc: not available Url : http://lists.eecs.utk.edu/mailman/private/lapack/attachments/20100728/3871cc3c/qss_main-0001.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: read_data.c Type: text/x-c++src Size: 2442 bytes Desc: not available Url : http://lists.eecs.utk.edu/mailman/private/lapack/attachments/20100728/3871cc3c/read_data-0002.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: read_data.h Type: text/x-chdr Size: 121 bytes Desc: not available Url : http://lists.eecs.utk.edu/mailman/private/lapack/attachments/20100728/3871cc3c/read_data-0003.bin |
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