1. Chapter 10 Sparse, Cell, & Structure Arrays

2. Sparse Arrays A sparse array (matrix) is a large matrix in which the vast majority of the elements are zero.

3. Sparse Matrix Functions sparse: Converts a full matrix into a sparse matrix. full: Converts a sparse matrix into a full matrix.

5. Sparse Array Example Solve the following simultaneous system of equations with sparse matrices: 1.0 X X X X4 = X X X X4 = X X X X4 = X X X X4 = 1.0

7. Cell Arrays Array in which each element is a bin which can contain an array. Cells of mixed data types are allowed. Use { } instead of ( ) for selecting & displaying the contents of cells.

8. Creating Cell Arrays C = cell(n) Creates n x n cell array of empty matrices. celldisp(C) Displays the content of cell array C. { } = empty cell

10. Example Cell Arrays
Result of executing the following script?
>>A=ones(3,2);
>>B=magic(3);
>>C=char(‘Pressure’,’Temp’,’Disp’);
>>D=[6+7j, 15];
>>Cel={A, B; C, D}

11. Structure Arrays Arrays composed of structures
Structure Arrays Arrays composed of structures. Each element is given a name (field). Each field may be of different type. Address fields with structure & field separated by period.

12. Structure Functions rmfield >> Remove field n_str=rmfield(str,’field’) fieldnames(S) Returns field names in structure S.