keep only < 273 for both icing and no-icing regions

modules/icing/pirep_goes.py

@@ -1220,3 +1220,25 @@ def run_mean_std(check_cloudy=False, no_icing_to_icing_ratio=5):
     [h5f.close() for h5f in no_ice_h5f_lst]
 
     return mean_dct, std_dct
+
+
+def split_data(num_obs, perc=0.2, skip=1):
+    idxs = np.arange(num_obs)
+    idxs = list(idxs)
+
+    num_test = int(num_obs * perc)
+    skip = int(num_obs / num_test)
+
+    test_idxs = idxs[::skip]
+
+    test_set = set(test_idxs)
+    train_set = (set(idxs)).difference(test_set)
+    train_idxs = list(train_set)
+
+    test_idxs = np.array(test_idxs)
+    train_idxs = np.array(train_idxs)
+
+    np.random.shuffle(test_idxs)
+    np.random.shuffle(train_idxs)
+
+    return train_idxs[::skip], test_idxs[::skip]