These generalized symmetric eigenproblems were extracted from various structural engineering packages such as GT-STRUDL, MCS/NASTRAN, and BCS ATLAS. They represent interesting problems encountered after the first set of structural engineering matrices were collected. Problems number 19, 20, and 22 have very poorly conditioned stiffness matrices. Problem 21 is a standard textbook problem with multiple eigenvalues.

Matrices in this set:

• BCSSTK19 (real symmetric indefinite, 817 by 817, 3835 entries), Part of a suspension bridge
• BCSSTK20 (real symmetric indefinite, 485 by 485, 1810 entries), Frame within a suspension bridge
• BCSSTK21 (real symmetric indefinite, 3600 by 3600, 15100 entries), Clamped square plate
• BCSSTK22 (real symmetric indefinite, 138 by 138, 417 entries), Textile loom frame
• BCSSTK23 (real symmetric indefinite, 3134 by 3134, 24156 entries), Part of a 3D globally triang. building
• BCSSTK24 (real symmetric indefinite, 3562 by 3562, 81736 entries), Calgary Olympic Saddledome arena
• BCSSTK25 (real symmetric indefinite, 15439 by 15439, 133840 entries), Columbia Center (Seattle) 76-story skyscraper
• BCSSTM19 (real symmetric positive definite, 817 by 817, 817 entries), Part of a suspension bridge
• BCSSTM20 (real symmetric positive definite, 485 by 485, 485 entries), Frame within a suspension bridge
• BCSSTM21 (real symmetric positive definite, 3600 by 3600, 3600 entries), Clamped square plate
• BCSSTM22 (real symmetric positive definite, 138 by 138, 138 entries), Textile loom frame
• BCSSTM23 (real symmetric positive definite, 3134 by 3134, 3134 entries), Part of a 3D globally triang. building
• BCSSTM24 (real symmetric positive definite, 3562 by 3562, 3562 entries), Calgary Olympic Saddledome arena
• BCSSTM25 (real symmetric positive definite, 15439 by 15439, 15439 entries), Columbia Center (Seattle) 76-story skyscraper
  
  
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Last change in this page: Wed Sep 22 13:33:27 US/Eastern 2004 [Comments: ]