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Home MathPack Matrix Format of the matrix file
See also: Format of the sparse matrix file, Format of the Vector File 

Format of the matrix file

The first line defines the index of the lower and upper row; the second line specifies the lower and upper column of the matrix extract. The following lines contain the elements of the specified matrix area, one line per row. The matrix elements may be stored in any format and must be separated by at least one blank.

The following example shows a matrix part which comprises the first four columns of the rows three to eight:

 
3   8 
1   4 
0.0     0.2     0.3     0.22 
1       2       0.2    -0.9 
0.8877  1e-2    0.55  -55.66 
3.3    -3.3    -4.4    -0.0002 
12.3   23.9     7.00    7 
10.883  0      -8       0.992

Last Update: 2023-Feb-06