Input: The sample number, mean, eigenvectors, eigenvalues of old data, , , , , the sample number and mean of
deleted samples , , .
Output: The sample number, mean, eigenvectors, eigenvalues of remained data, , , , .
 (1) Update the sample number and mean, , .
 (2) Compute the extra deleted sample, .
 (3) Equivalent deleted data matrix, .
 (4) Compute , via EVD-Dualdating with , and deleted data .
Algorithm 4: EVDD-base decremental PCA (EVDD-DPCA).