Open MarcelKoch opened 1 week ago
Actually, this is already checked. But the issue remains if the MM-file contains multiple values per line. Then each value in a row seems to be interpreted as being on a row by itself. Thus the value is not interpreted as the next column value, but instead as a value for the next row.
Consider this file:
%%MatrixMarket matrix array real general
4 2
1 1
2 2
3 3
4 4
Then reading and writing it again one would expect (without deeper knowledge of the MM standard) the matrix entries in a single list using column major format:
%%MatrixMarket matrix array real general
4 2
1
2
3
4
1
2
3
4
But instead one gets
%%MatrixMarket matrix array real general
4 2
1
1
2
2
3
3
4
4
Reading an MM-file doesn't check the file itself for consistency. For example, if the MM file defines a
6x4
matrix, but less then 24 lines after the size definition contain values, not all values of the created matrix/vector will be filled. IMO there should be a simple test that after a definition of aMxN
dense matrix, exactlyM * N
lines should contain a value. This checking would not apply to the coordinate format, as missing values will be assumed to be zero anyway.