30 June 2020 9:27:56.676 AM FD2D_PREDATOR_PREY FORTRAN90 version A two dimensional finite difference algorithm for a predator-prey system. Enter parameter alpha: Enter parameter beta: Enter parameter gamma: Enter parameter delta: Enter a in [a,b]: Enter b in [a,b]: Enter space-step h: Enter maximum time t: Enter time-step Delta t: Enter SOLVE ( 0 = GMRES, 1 = Jacobi ): Parameters: ALPHA = 0.400000 BETA = 2.00000 GAMMA = 0.600000 DELTA = 10.0000 A = 0.00000 B = 500.000 H = 1.00000 BIGJ = 500 (number of intervals on one side) DIMJ = 501 (number of nodes on one side) N = 251001 (total number of nodes) T = 150.000 (final time) DELT = 0.416667E-01 (time step) TIME_STEPS = 3600 MU = 0.416667E-01 SOLVE = 0.416667E-01 = Jacobi iteration. Arrays allocated. Arrays initialized. FD2D_PREDATOR_PREY: Maximum number of nonzeros = 1255991 Sparse matrix values assigned. Begin sorting. 30 June 2020 9:27:56.736 AM 30 June 2020 9:27:57.775 AM Sorting done. Compress the matrix data. Initial number of matrix entries, NZ_NUM = 1255991 After compression, NZ_NUM = 1253997 Begin time loop. TIME_STEP = 360 30 June 2020 9:28:28.812 AM Number of iterations: 4 Last change in solution 0.584790E-05 Number of iterations: 10 Last change in solution 0.178352E-04 TIME_STEP = 720 30 June 2020 9:28:59.955 AM Number of iterations: 5 Last change in solution 0.188241E-05 Number of iterations: 10 Last change in solution 0.267525E-04 TIME_STEP = 1080 30 June 2020 9:29:32.037 AM Number of iterations: 4 Last change in solution 0.880453E-05 Number of iterations: 10 Last change in solution 0.380718E-04 TIME_STEP = 1440 30 June 2020 9:30:05.656 AM Number of iterations: 5 Last change in solution 0.307342E-05 Number of iterations: 10 Last change in solution 0.649733E-04 TIME_STEP = 1800 30 June 2020 9:30:40.053 AM Number of iterations: 5 Last change in solution 0.433260E-05 Number of iterations: 10 Last change in solution 0.942496E-04 TIME_STEP = 2160 30 June 2020 9:31:14.370 AM Number of iterations: 5 Last change in solution 0.436230E-05 Number of iterations: 10 Last change in solution 0.102442E-03 TIME_STEP = 2520 30 June 2020 9:31:47.556 AM Number of iterations: 5 Last change in solution 0.592924E-05 Number of iterations: 10 Last change in solution 0.127553E-03 TIME_STEP = 2880 30 June 2020 9:32:21.745 AM Number of iterations: 5 Last change in solution 0.529609E-05 Number of iterations: 10 Last change in solution 0.132707E-03 TIME_STEP = 3240 30 June 2020 9:32:54.371 AM Number of iterations: 5 Last change in solution 0.653224E-05 Number of iterations: 10 Last change in solution 0.124188E-03 TIME_STEP = 3600 30 June 2020 9:33:27.133 AM Number of iterations: 5 Last change in solution 0.456149E-05 Number of iterations: 10 Last change in solution 0.126209E-03 FD2D_PREDATOR_PREY: Normal end of execution. 30 June 2020 9:33:27.401 AM