Hi Grace,
From what I understand, the goal is to create a MATLAB code that can generate the CRS structure for any given matrix.
Let's break down the steps to implement the CRS structure based on the reference article you provided:
- Initialize the CRS structure:
- Create three empty arrays:“val”,“rind”, and“cind”.
- “val”will store the non-zero values of the matrix.
- “rind”will store the row indices corresponding to the non-zero values.
- “cind”will store the column indices corresponding to the non-zero values.
- Traverse the matrix:
- Iterate over each row of the matrix.
- Within each row, iterate over each column.
- If the element at the current position is non-zero, store its value in the“val”array.
- Store the row index in the“rind”array.
- Store the column index in the“cind”array.
- Finalize the CRS structure:
- After traversing the entire matrix, store the total number of non-zero elements in a variable,“nnz”.
- Append a zero at the end of the“val”array.
- Append the value“nnz”at the end of the“rind”array.
- Append the value“nnz”at the end of the“cind”array.
Here's an example implementation:
matrix = [1 0 0 0; 0 2 0 0; 3 0 4 0; 0 0 0 5];
[nrows, ncols] = size(matrix);
val = [val matrix(i, j)];
disp("val: " + mat2str(val))
disp("rind: " + mat2str(rind))
disp("cind: " + mat2str(cind))
Attached below are some documentation links that you may find helpful:
Hope this helps!
Karan Singh Khati