Description Usage Arguments Details Author(s) Examples
The EXPOKIT
's DMEPXV and DGEXPV functions both deal with sparse matrices.
These matrices have a lot of zeros, and can therefore be stored more efficiently by converting the
matrix into CRS (Compressed Row Storage) format.
1 | crs2mat(mat, n)
|
mat |
a 3 column list including the vectors; ia, ja and a. |
n |
the dimension of the square (nxn) matrix. |
In EXPOKIT
and its wrapper functions, a CRS-formatted matrix is input as
3 vectors:
ia = row pointer. This vector stores the location in the ‘a’ vector that is the first non-zero element
in a row.
ja = column indices for non-zero elements.
a = non-zero elements of the matrix.
This function takes a 3-column list CRS matrix and converts it back to standard square format.
Meabh G. McCurdy mmccurdy01@qub.ac.uk
1 2 3 4 5 6 7 8 9 10 |
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