matplotlib
diff --git a/‎lib/matplotlib/_mathtext.py
Lines changed: 25 additions & 0 deletions b/‎lib/matplotlib/_mathtext.py
Lines changed: 25 additions & 0 deletions
diff --git a/‎lib/matplotlib/tests/baseline_images/test_mathtext/mathtext1_dejavusans_05.png
5.75 KB b/‎lib/matplotlib/tests/baseline_images/test_mathtext/mathtext1_dejavusans_05.png
5.75 KB
diff --git a/‎lib/matplotlib/tests/test_mathtext.py
Lines changed: 1 addition & 1 deletion b/‎lib/matplotlib/tests/test_mathtext.py
Lines changed: 1 addition & 1 deletion
@@ -1864,6 +1864,7 @@ def csnames(group, names):
         p.text             = Forward()
         p.token            = Forward()
         p.underset         = Forward()
+        p.substack         = Forward()
 
         set_names_and_parse_actions()  # for mutually recursive definitions.
 
@@ -1914,6 +1915,9 @@ def csnames(group, names):
 
         p.text <<= cmd(r"\text", QuotedString('{', '\\', endQuoteChar="}"))
 
+        p.substack <<= cmd(
+            r"\substack", OneOrMore(p.required_group("value")))
+
         p.placeable     <<= (
             p.accent     # Must be before symbol as all accents are symbols
             | p.symbol   # Must be second to catch all named symbols and single
@@ -1930,6 +1934,7 @@ def csnames(group, names):
             | p.sqrt
             | p.overline
             | p.text
+            | p.substack
         )
 
         p.simple        <<= (
@@ -2599,3 +2604,23 @@ def auto_delim(self, s, loc, toks):
             # if "mid" in toks ... can be removed when requiring pyparsing 3.
             toks["mid"].asList() if "mid" in toks else [],
+
+    def substack(self, s, loc, toks):
+        state = self.get_state()
+        thickness = state.get_current_underline_thickness()
+        vlist = []
+
+        max_width = sorted(toks[1:], key= lambda c: c.width)[-1].width
+
+        for sub in toks[1:]:
+            cp = HCentered([sub])
+            cp.hpack(max_width, 'exactly')
+            vlist.append(cp)
+
+        vlist = [x for l in (vlist[i:i+1] +
+                             [Vbox(0, thickness * 2.0)] *
+                             (i < len(vlist) - 1)
+                             for i in range(0, len(vlist), 1)) for x in l]
+        vlt = Vlist(vlist)
+        result = [Hlist([vlt])]
+        return result
@@ -134,7 +134,7 @@
     r'$\sum x\quad\sum^nx\quad\sum_nx\quad\sum_n^nx\quad\prod x\quad\prod^nx\quad\prod_nx\quad\prod_n^nx$',  # GitHub issue 18085
     r'$1.$ $2.$ $19680801.$ $a.$ $b.$ $mpl.$',
     r'$\text{text}_{\text{sub}}^{\text{sup}} + \text{\$foo\$} + \frac{\text{num}}{\mathbf{\text{den}}}\text{with space, curly brackets \{\}, and dash -}$',
-
+    r'$\sum_{\substack{k = 1}{k \neq \lfloor n/2\rfloor}}^{n}P(i,j) \sum_{\substack{i \neq 0}{-1 \leq i \leq 3}{1 \leq j \leq 5}} F^i(x,y)}$',
 ]
 
 digits = "0123456789"
Original file line number	Diff line number	Diff line change
`@@ -134,7 +134,7 @@`
`134`	`134`	`r'$\sum x\quad\sum^nx\quad\sum_nx\quad\sum_n^nx\quad\prod x\quad\prod^nx\quad\prod_nx\quad\prod_n^nx$', # GitHub issue 18085`
`135`	`135`	`r'$1.$ $2.$ $19680801.$ $a.$ $b.$ $mpl.$',`
`136`	`136`	`r'$\text{text}_{\text{sub}}^{\text{sup}} + \text{\$foo\$} + \frac{\text{num}}{\mathbf{\text{den}}}\text{with space, curly brackets \{\}, and dash -}$',`
`137`		`-`
	`137`	`+ r'$\sum_{\substack{k = 1}{k \neq \lfloor n/2\rfloor}}^{n}P(i,j) \sum_{\substack{i \neq 0}{-1 \leq i \leq 3}{1 \leq j \leq 5}} F^i(x,y)}$',`
`138`	`138`	`]`
`139`	`139`
`140`	`140`	`digits = "0123456789"`