private void Form1_Load(object sender, EventArgs e)
{
// Make some sparse arrays.
SparseIntArray array1 = new SparseIntArray(0);
array1[1, 1] = 101;
array1[-1, -1] = -101;
array1[3, 3] = 303;
array1[2, 4] = 204;
array1[4, 1] = 401;
SparseIntArray array2 = new SparseIntArray(0);
array2[1, 0] = 100;
array2[3, 3] = 303;
array2[1, 4] = 104;
array2[4, 1] = 401;
array2[10, 10] = 1010;
SparseIntArray array3 = array1.Add(array2);
resultTextBox.Text =
array1.ToString() + Environment.NewLine +
array2.ToString() + Environment.NewLine +
array3.ToString();
resultTextBox.Select(0, 0);
}
// Add two SparseArrays representing matrices.
public SparseIntArray Add(SparseIntArray other)
{
SparseIntArray result = new SparseIntArray(this.DefaultValue);
// Variables to move through all of the arrays.
IntArrayRow array1Row = this.TopSentinel.NextRow;
IntArrayRow array2Row = other.TopSentinel.NextRow;
IntArrayRow resultRow = result.TopSentinel;
while ((array1Row != null) && (array2Row != null))
{
// Make a new result row.
resultRow.NextRow = new IntArrayRow();
resultRow = resultRow.NextRow;
resultRow.RowSentinel = new IntArrayEntry();
resultRow.NextRow = null;
// See which input row has the smaller row number.
if (array1Row.RowNumber < array2Row.RowNumber)
{
// array1Row comes first. Copy its values into result.
resultRow.RowNumber = array1Row.RowNumber;
CopyEntries(array1Row.RowSentinel.NextEntry, resultRow.RowSentinel);
array1Row = array1Row.NextRow;
}
else if (array2Row.RowNumber < array1Row.RowNumber)
{
// array2Row comes first. Copy its values into result.
resultRow.RowNumber = array2Row.RowNumber;
CopyEntries(array2Row.RowSentinel.NextEntry, resultRow.RowSentinel);
array2Row = array2Row.NextRow;
}
else
{
// The row numbers are the same. Add their values.
resultRow.RowNumber = array1Row.RowNumber;
AddEntries(
array1Row.RowSentinel.NextEntry,
array2Row.RowSentinel.NextEntry,
resultRow.RowSentinel);
array1Row = array1Row.NextRow;
array2Row = array2Row.NextRow;
}
}
// Add any remaining rows.
if (array1Row != null)
{
// Make a new result row.
resultRow.NextRow = new IntArrayRow();
resultRow = resultRow.NextRow;
resultRow.RowNumber = array1Row.RowNumber;
resultRow.RowSentinel = new IntArrayEntry();
resultRow.NextRow = null;
CopyEntries(array1Row.RowSentinel.NextEntry, resultRow.RowSentinel);
}
if (array2Row != null)
{
// Make a new result row.
resultRow.NextRow = new IntArrayRow();
resultRow = resultRow.NextRow;
resultRow.RowNumber = array2Row.RowNumber;
resultRow.RowSentinel = new IntArrayEntry();
resultRow.NextRow = null;
CopyEntries(array2Row.RowSentinel.NextEntry, resultRow.RowSentinel);
}
return(result);
}
