yanyaqin wrote:

Hi folks, I'm ready to use boost lu_substitute for solving sparse symmetric linear equation, but the document for lu.hpp is almost none. Is there someone could provide me a real number demo?

Best regards! Yan Yaqin 2004-09-02

Hi, Yan Yaqin attached is a simple example that use lu_substitute et al to calculate the length of each spring in a system of 10 springs arranged in series: |------o------o--- ~ ---o------o------| where each spring has a random stiffness in the range 0.8 <= k <= 1.2 $ g++ -I$HOME/boost/1_31_0 -o mesh mesh.cpp $ ./mesh Node[0] position: 0 Node[1] position: 0.864606, element length: 0.864606 Node[2] position: 1.93203, element length: 1.06742 Node[3] position: 3.14607, element length: 1.21404 Node[4] position: 4.03935, element length: 0.893288 Node[5] position: 5.02106, element length: 0.981706 Node[6] position: 5.96605, element length: 0.94499 Node[7] position: 6.95916, element length: 0.993113 Node[8] position: 8.02025, element length: 1.06109 Node[9] position: 9, element length: 0.979749 Note that the code doesn't run when compiled against current Boost CVS because of a bug introduced to the Ublas library yesterday. Regards, Angus