This file is created when the
OUTPUT,MATRIX,REDUCED,DENSE/SPARSE
I/O Options Entry is used.
File Contents
Output
Description
Reduced Stiffness Matrix
Is output by default or if the DENSE option is selected
for Modal Frequency Response Analysis. This also includes the Resvec
modes, for which the Eigenvalues are printed, and for the structural
modes, the Generalized stiffness values are printed in the matrix. If
SPARSE is selected, then the sparse matrix with all
the zeros excluded, is printed in the
<filename>.reduced.mat file.
Reduced Mass Matrix
Is output by default or if the DENSE option is selected
for Modal Frequency Response Analysis. If SPARSE is
selected, then the sparse matrix with all the zeros excluded, is printed
in the <filename>.reduced.mat file.
File Format
The .reduced.mat file has the following format:
Name
Content
Matrix Name
Identifies the matrix name (STIFFNESS, MASS, or DOFS)
Subcase ID
The subcase ID of the corresponding Modal Frequency Response
Subcase
Number Type
Identifies whether the matrix elements are Integers (1), Real (2), or
Complex (3) numbers
Matrix Type
Identifies the matrix type of Dense (1) or Sparse (3) matrix
Matrix Size (mxn)
Indicates the size of the matrix (m columns and n rows)
Precision Information
Fortran precision information
Matrix Data
Matrices are presented as a list of Columns with a range of row elements
for each column ID.
Figure 1. Dense Matrix Example Figure 2. Sparse Matrix Example
