Matrix: Cylshell/s3rmt3m3

Description: FEM, cylindrical shell, graded tri. mesh w/ 1666 triangles. , R/t=1000

Cylshell/s3rmt3m3 graph
(undirected graph drawing)

Cylshell/s3rmt3m3 graph

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  • Matrix group: Cylshell
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  • download as a MATLAB mat-file, file size: 1 MB. Use UFget(1611) or UFget('Cylshell/s3rmt3m3') in MATLAB.
  • download in Matrix Market format, file size: 1 MB.
  • download in Rutherford/Boeing format, file size: 965 KB.

    Matrix properties
    number of rows5,357
    number of columns5,357
    structural full rank?yes
    structural rank5,357
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries572
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorR. Kouhia
    editorR. Boisvert, R. Pozo, K. Remington, B. Miller, R. Lipman, R. Barrett, J. Dongarra
    kindstructural problem
    2D/3D problem?yes

    Additional fieldssize and type
    coordfull 5357-by-3


    %FILE  s3rmt3m3.mtx                                                            
    %TITLE Cyl shell R/t=1000 grad trian mesh 1666 stab MITC3 elem with drill rot  
    %KEY   s3rmt3m3                                                                
    %CONTRIBUTOR Reijo Kouhia (                                
    %BEGIN DESCRIPTION                                                             
    % Matrix from a static analysis of a cylindrical shell                         
    % Radius to thickness ratio R/t = 1000                                         
    % Length to radius ratio    R/L = 1                                            
    % One octant discretized with graded triangular mesh (1666 elements)           
    % element:                                                                     
    % facet-type shell element where the bending part is formulated                
    % using the stabilized MITC theory (stabilization paramater 0.4)               
    % the membrane part includes drilling rotations using                          
    % the Hughes-Brezzi formulation with (regularizing parameter = G/1000,         
    % where G is the shear modulus)                                                
    % full 3-point integration                                                     
    % --------------------------------------------------------------------------   
    % Note:                                                                        
    % The sparsity pattern of the matrix is determined from the element            
    % connectivity data assuming that the element matrix is full.                  
    % Since this case the  material model is linear isotropically elastic          
    % there exist some zeros.                                                      
    % Since the removal of those zero elements is trivial                          
    % but the reconstruction of the current sparsity                               
    % pattern is impossible from the sparsified structure without any further      
    % knowledge of the element connectivity, the zeros are retained in this file.  
    % ---------------------------------------------------------------------------  
    %END DESCRIPTION                                                               

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD438,361
    Cholesky flop count5.7e+07
    nnz(L+U), no partial pivoting, with AMD871,365
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD566,229
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD1,115,039

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 572 explicit zero entries.

    SVD-based statistics:
    null space dimension0
    full numerical rank?yes

    singular values (MAT file):click here
    SVD method used:s = svd (full (A)) ;

    Cylshell/s3rmt3m3 svd

    For a description of the statistics displayed above, click here.

    Maintained by Tim Davis, last updated 12-Mar-2014.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.