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

The first line of a sparse matrix file contains the unique identifier 'SLD_sparse_matrix'. This identifier is used by LoadSparseMat to ensure that the format is correct. The next line contains the number of nonzero elements of the sparse matrix. The next two lines contain the lowest and highest column and row indices. All other lines contain the matrix data using the format [ix,iy]=value. All lines may contain comments separated by double slashes. The following example shows a small sample matrix :
SDL_sparse_matrix 12 // number of elements in sparse matrix 2 9 // lowest and highest column 1 10 // lowest and highest row [2,1]=211 [3,2]=3002 [3,5]=305 [3,7]=38777 [3,8]=8 [3,10]=30 [5,7]=4421107 [7,7]=712007 [8,1]=112001 [8,8]=22 [9,1]=21401 [9,7]=933
