A modified code for R-mode correspondence analysis of large-scale problems
A modified FORTRAN code for R-mode correspondence analysis is presented for large-scale digital image analysis problems. It reduces the required memory capacity by more than a factor of 4M. where M is the number of Variables considered per sample. The original code, CORSPOND. requires 4NM memory. where N is the total number of samples that are considered. The modified code requires only an N-dimensional vector to form the matrix S. For a PC having 128 MB RAM. the code can be used for a problem with up to N = 253,000 and M = 30. The code automatically detects, then shifts negative values to zeros or positive values. Applications to grey-level co-occurrence matrix parameter data are used to demonstrate the efficiency of the code. (C) 2001 Elsevier Science Ltd. All rights reserved.
correspondence analysis digital image analysis aeromagnetic data grey-level co-occurrence matrices