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Turnbull China Bikeride
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Turnbull China Bikeride - Disc 1.iso
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examples
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sparse
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1994-09-20
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776b
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52 lines
//
// Create and manipulate sparse matrices via RLaB lists.
//
//
// Given row and column indices, create a sparse matrix
// structure using lists.
//
make_sparse = function ( cm )
{
sm = <<>>; // Create initial list.
ri = set (cm[;1]); // Get a set of the row indices.
for (i in 1:ri.n) // Create the row lists.
{
sm.[ri[i]] = <<>>;
}
// Now load up the sparse matrix
for (i in 1:cm.nr)
{
sm.[cm[i;1]].[cm[i;2]] = cm[i;3];
}
return sm;
};
//
// Print out a sparse matrix.
//
print_sparse = function ( sm )
{
for (i in members (sm))
{
for (j in members (sm.[i]))
{
printf (" row: %6s\tcol: %6s\tvalue: %g\n", i, j, sm.[i].[j]);
}
}
};
//
// Add two sparse matrices.
//
//
// Multiply two sparse matrices.
//