void start(int rows, int columns, int startRow, int endRow, int startColumn, int endColumn)
This method is called once before any entry of the matrix is visited.
rows- number of rows of the matrix
columns- number of columns of the matrix
startRow- Initial row index
endRow- Final row index (inclusive)
startColumn- Initial column index
endColumn- Final column index (inclusive)
void visit(int row, int column, double value)
row- row index of the entry
column- column index of the entry
value- current value of the entry
This method is called once after all entries of the matrix have been visited.
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