%%MatrixMarket matrix coordinate real general
 %=================================================================================
 %
 % This ASCII file represents a sparse MxN matrix with L 
 % nonzeros in the following Matrix Market format:
 %
 % +----------------------------------------------+
 % |%%MatrixMarket matrix coordinate real general | <--- header line
 % |%                                             | <--+
 % |% comments                                    |    |-- 0 Or more comment lines
 % |%                                             | <--+         
 % |    M  N  L                                   | <--- rows, columns, entries
 % |    I1  J1  A(I1, J1)                         | <--+
 % |    I2  J2  A(I2, J2)                         |    |
 % |    I3  J3  A(I3, J3)                         |    |-- L lines
 % |        . . .                                 |    |
 % |    IL JL  A(IL, JL)                          | <--+
 % +----------------------------------------------+   
 %
 % Indices are 1-based, i.e. A(1,1) Is the first element.
 %
 %=================================================================================
  5  5  8
    1     1   1.000e+00
    2     2   1.050e+01
    3     3   1.500e-02
    1     4   6.000e+00
    4     2   2.505e+02
    4     4  -2.800e+02
    4     5   3.332e+01
    5     5   1.200e+01