Python program to Convert a Matrix to Sparse Matrix Last Updated : 15 Jan, 2025 Comments Improve Suggest changes Like Article Like Report Converting a matrix to a sparse matrix involves storing only non-zero elements along with their row and column indices to save memory.Using a DictionaryConverting a matrix to a sparse matrix using a dictionary involves storing only the non-zero elements of the matrix, with their row and column indices as keys and the corresponding values as dictionary values. Python m = [ [1, 0, 0, 0], [0, 0, 3, 0], [0, 0, 0, 4] ] sparse_matrix = {} for i in range(len(m)): for j in range(len(m[i])): if m[i][j] != 0: sparse_matrix[(i, j)] = m[i][j] print(sparse_matrix) Output{(0, 0): 1, (1, 2): 3, (2, 3): 4} Explanation:The program iterates through each element of the matrix and stores non-zero elements in a dictionary, where the key is a tuple of indices (i, j) and the value is the element.This reduces memory usage by only storing non-zero values.Using a List of TuplesConverting a matrix to a sparse matrix using a list of tuples involves storing the non-zero elements as tuples where each tuple contains the row index, column index and the value. This method is efficient for representing sparse matrices while maintaining the order of the elements. Python m = [ [1, 0, 0, 0], [0, 0, 3, 0], [0, 0, 0, 4] ] sparse_matrix = [] for i in range(len(m)): for j in range(len(m[i])): if m[i][j] != 0: sparse_matrix.append((i, j, m[i][j])) print(sparse_matrix) Output[(0, 0, 1), (1, 2, 3), (2, 3, 4)] Explanation:The program creates a list of tuples, each containing the row index, column index, and non-zero value of the matrix.This format allows easy tracking of positions and values for sparse matrices. Comment More infoAdvertise with us Next Article Python program to Convert a Matrix to Sparse Matrix riturajsaha Follow Improve Article Tags : Python Python Programs python-list Python list-programs Python matrix-program +1 More Practice Tags : pythonpython-list Similar Reads Python Program to Check if a given matrix is sparse or not A matrix is a two-dimensional data object having m rows and n columns, therefore a total of m*n values. If most of the values of a matrix are 0 then we say that the matrix is sparse. 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