Rename variable `N(anti|cyclo)` to `N_eddies`

Rename variable `N(anti|cyclo)` to `N_eddies` in file
`N(anti|cyclo).mat`. Motivation: allow more transparent processing in
`overlap_v6.py`.

Convert_Matlab/overlap.m

@@ -25,12 +25,14 @@ toc
 clear
 disp('Processing Parameters_Anticyclonic_Eddies...')
 load('Parameters_Anticyclonic_Eddies.mat', 'Nanti', 'date_num')
-save('Nanti', 'Nanti', '-v6')
+N_eddies = Nanti;
+save('Nanti', 'N_eddies', '-v6')
 save('date_num', 'date_num', '-v6')
 
 clear
 disp('Processing Parameters_Cyclonic_Eddies...')
 load('Parameters_Cyclonic_Eddies.mat', 'Ncyclo')
-save('Ncyclo', 'Ncyclo', '-v6')
+N_eddies = Ncyclo;
+save('Ncyclo', 'N_eddies', '-v6')
 
 exit

Convert_Matlab/overlap_v6.py

@@ -28,8 +28,8 @@ def adjust_n(n_Matlab):
 orientation = sys.argv[1] # "cyclo" or "anti"
 id_child = sio.loadmat(f"id_child_{orientation}.mat", squeeze_me=True)\
     ["id_child"]
-n_eddies = sio.loadmat(f"N{orientation}.mat", squeeze_me = True)\
-    [f"N{orientation}"].astype(int, casting = "safe", copy = False)
+n_eddies = sio.loadmat(f"N{orientation}.mat", squeeze_me = True)["N_eddies"]\
+              .astype(int, casting = "safe", copy = False)
 date_num = sio.loadmat("date_num.mat", squeeze_me = True)["date_num"]
 n_dates = n_eddies.size
 print("n_dates =", n_dates)