Merge pull request matplotlib#25087 from MichaDit/feat/add-new-si-prefixes

feat: add new SI prefixes to ticker

Author: ksunden

lib/matplotlib/tests/test_ticker.py

@@ -1290,8 +1290,8 @@ class TestEngFormatter:
         (True, 1001, ('1.001 k', '1 k', '1.00 k')),
         (True, 100001, ('100.001 k', '100 k', '100.00 k')),
         (True, 987654.321, ('987.654 k', '988 k', '987.65 k')),
-        # OoR value (> 1000 Y)
-        (True, 1.23e27, ('1230 Y', '1230 Y', '1230.00 Y'))
+        # OoR value (> 1000 Q)
+        (True, 1.23e33, ('1230 Q', '1230 Q', '1230.00 Q'))
     ]
 
     @pytest.mark.parametrize('unicode_minus, input, expected', raw_format_data)

lib/matplotlib/ticker.py

@@ -1330,6 +1330,8 @@ class EngFormatter(Formatter):
 
     # The SI engineering prefixes
     ENG_PREFIXES = {
+        -30: "q",
+        -27: "r",
         -24: "y",
         -21: "z",
         -18: "a",
@@ -1346,7 +1348,9 @@ class EngFormatter(Formatter):
          15: "P",
          18: "E",
          21: "Z",
-         24: "Y"
+         24: "Y",
+         27: "R",
+         30: "Q"
     }
 
     def __init__(self, unit="", places=None, sep=" ", *, usetex=None,