--- a/NEWS	Wed Nov 04 19:55:43 2020 -0800
+++ b/NEWS	Wed Nov 04 20:18:11 2020 -0800
@@ -169,6 +169,9 @@
 * `rng`
 * `startsWith`
 * `streamribbon`
+* `xtickangle`
+* `ytickangle`
+* `ztickangle`
 
 ### Deprecated functions and properties
 

--- a/doc/interpreter/plot.txi	Wed Nov 04 19:55:43 2020 -0800
+++ b/doc/interpreter/plot.txi	Wed Nov 04 20:18:11 2020 -0800
@@ -342,6 +342,16 @@
 @findex zticklabels
 @DOCSTRING(xticklabels)
 
+The @code{xtickangle}, @code{ytickangle}, and @code{ztickangle} functions
+may be used to get or set the rotation angle of labels for the respective axis.
+Each has the same form.
+
+@anchor{XREFytickangle}
+@anchor{XREFztickangle}
+@findex ytickangle
+@findex ztickangle
+@DOCSTRING(xtickangle)
+
 @node Two-dimensional Function Plotting
 @subsubsection Two-dimensional Function Plotting
 @cindex plotting, two-dimensional functions

--- a/scripts/help/__unimplemented__.m	Wed Nov 04 19:55:43 2020 -0800
+++ b/scripts/help/__unimplemented__.m	Wed Nov 04 20:18:11 2020 -0800
@@ -1319,16 +1319,13 @@
   "xmlread",
   "xmlwrite",
   "xslt",
-  "xtickangle",
   "xtickformat",
   "year",
   "years",
   "ymd",
-  "ytickangle",
   "ytickformat",
   "yyaxis",
   "yyyymmdd",
-  "ztickangle",
   "ztickformat",
   };
 

--- a/scripts/plot/appearance/module.mk	Wed Nov 04 19:55:43 2020 -0800
+++ b/scripts/plot/appearance/module.mk	Wed Nov 04 20:18:11 2020 -0800
@@ -53,10 +53,12 @@
   %reldir%/ylabel.m \
   %reldir%/ylim.m \
   %reldir%/yticks.m \
+  %reldir%/ytickangle.m \
   %reldir%/yticklabels.m \
   %reldir%/zlabel.m \
   %reldir%/zlim.m \
   %reldir%/zticks.m \
+  %reldir%/ztickangle.m \
   %reldir%/zticklabels.m
 
 %canon_reldir%dir = $(fcnfiledir)/plot/appearance

--- a/scripts/plot/appearance/private/__tickangle__.m	Wed Nov 04 19:55:43 2020 -0800
+++ b/scripts/plot/appearance/private/__tickangle__.m	Wed Nov 04 20:18:11 2020 -0800
@@ -43,7 +43,7 @@
         return;
       else
         angle = hax;
-        hax = gca ();
+        hax = [];
       endif
 
     case 3
@@ -59,6 +59,10 @@
     error ([caller ": function called with output query and input set value"]);
   endif
 
+  if (isempty (hax))
+    hax = gca ();
+  endif
+
   set (hax, [ax, "ticklabelrotation"], angle);
 
 endfunction

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/plot/appearance/ytickangle.m	Wed Nov 04 20:18:11 2020 -0800
@@ -0,0 +1,93 @@
+########################################################################
+##
+## Copyright (C) 2020 The Octave Project Developers
+##
+## See the file COPYRIGHT.md in the top-level directory of this
+## distribution or <https://octave.org/copyright/>.
+##
+## This file is part of Octave.
+##
+## Octave is free software: you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## Octave is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with Octave; see the file COPYING.  If not, see
+## <https://www.gnu.org/licenses/>.
+##
+########################################################################
+
+## -*- texinfo -*-
+## @deftypefn  {} {@var{angle} =} ytickangle ()
+## @deftypefnx {} {@var{angle} =} ytickangle (@var{hax})
+## @deftypefnx {} {} ytickangle (@var{angle})
+## @deftypefnx {} {} ytickangle (@var{hax}, @var{angle})
+## Query or set the rotation angle of the tick labels on the y-axis of the
+## current axes.
+##
+## When called without an argument, return the rotation angle in degrees of the
+## tick labels as specified in the axes property @qcode{"YTickLabelRotation"}.
+## When called with a numeric scalar @var{angle}, rotate the tick labels
+## counterclockwise to @var{angle} degrees.
+##
+## If the first argument @var{hax} is an axes handle, then operate on this axes
+## rather than the current axes returned by @code{gca}.
+##
+## Programming Note: Requesting a return value while also setting a specified
+## rotation will result in an error.
+##
+## @seealso{xtickangle, ztickangle, get, set}
+## @end deftypefn
+
+function retval = ytickangle (hax, angle)
+
+  switch (nargin)
+    case 0
+      retval = __tickangle__ (mfilename ());
+
+    case 1
+      if (nargout > 0)
+        retval = __tickangle__ (mfilename (), hax);
+      else
+        __tickangle__ (mfilename (), hax);
+      endif
+
+    case 2
+      if (nargout > 0)
+        retval = __tickangle__ (mfilename (), hax, angle);
+      else
+        __tickangle__ (mfilename (), hax, angle);
+      endif
+
+  endswitch
+
+endfunction
+
+
+%!test
+%! hf = figure ("visible", "off");
+%! hax = axes (hf);
+%! unwind_protect
+%!   ytickangle (45);
+%!   assert (ytickangle (), 45);
+%!   ytickangle (hax, 90);
+%!   a1 = ytickangle ();
+%!   a2 = ytickangle (hax);
+%!   assert (a1, a2);
+%!   assert (a1, 90);
+%! unwind_protect_cleanup
+%!   close (hf);
+%! end_unwind_protect
+
+## Test input validation
+%!error <HAX must be a handle to an axes object> ytickangle (0, 45)
+%!error <ANGLE must be .* scalar> ytickangle (eye (2))
+%!error <ANGLE must be .* numeric> ytickangle ({90})
+%!error <ANGLE must be .* finite> ytickangle (Inf)
+%!error <called with output query and input set value> ang = ytickangle (45)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/plot/appearance/ztickangle.m	Wed Nov 04 20:18:11 2020 -0800
@@ -0,0 +1,93 @@
+########################################################################
+##
+## Copyright (C) 2020 The Octave Project Developers
+##
+## See the file COPYRIGHT.md in the top-level directory of this
+## distribution or <https://octave.org/copyright/>.
+##
+## This file is part of Octave.
+##
+## Octave is free software: you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## Octave is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with Octave; see the file COPYING.  If not, see
+## <https://www.gnu.org/licenses/>.
+##
+########################################################################
+
+## -*- texinfo -*-
+## @deftypefn  {} {@var{angle} =} ztickangle ()
+## @deftypefnx {} {@var{angle} =} ztickangle (@var{hax})
+## @deftypefnx {} {} ztickangle (@var{angle})
+## @deftypefnx {} {} ztickangle (@var{hax}, @var{angle})
+## Query or set the rotation angle of the tick labels on the z-axis of the
+## current axes.
+##
+## When called without an argument, return the rotation angle in degrees of the
+## tick labels as specified in the axes property @qcode{"ZTickLabelRotation"}.
+## When called with a numeric scalar @var{angle}, rotate the tick labels
+## counterclockwise to @var{angle} degrees.
+##
+## If the first argument @var{hax} is an axes handle, then operate on this axes
+## rather than the current axes returned by @code{gca}.
+##
+## Programming Note: Requesting a return value while also setting a specified
+## rotation will result in an error.
+##
+## @seealso{xtickangle, ytickangle, get, set}
+## @end deftypefn
+
+function retval = ztickangle (hax, angle)
+
+  switch (nargin)
+    case 0
+      retval = __tickangle__ (mfilename ());
+
+    case 1
+      if (nargout > 0)
+        retval = __tickangle__ (mfilename (), hax);
+      else
+        __tickangle__ (mfilename (), hax);
+      endif
+
+    case 2
+      if (nargout > 0)
+        retval = __tickangle__ (mfilename (), hax, angle);
+      else
+        __tickangle__ (mfilename (), hax, angle);
+      endif
+
+  endswitch
+
+endfunction
+
+
+%!test
+%! hf = figure ("visible", "off");
+%! hax = axes (hf);
+%! unwind_protect
+%!   ztickangle (45);
+%!   assert (ztickangle (), 45);
+%!   ztickangle (hax, 90);
+%!   a1 = ztickangle ();
+%!   a2 = ztickangle (hax);
+%!   assert (a1, a2);
+%!   assert (a1, 90);
+%! unwind_protect_cleanup
+%!   close (hf);
+%! end_unwind_protect
+
+## Test input validation
+%!error <HAX must be a handle to an axes object> ztickangle (0, 45)
+%!error <ANGLE must be .* scalar> ztickangle (eye (2))
+%!error <ANGLE must be .* numeric> ztickangle ({90})
+%!error <ANGLE must be .* finite> ztickangle (Inf)
+%!error <called with output query and input set value> ang = ztickangle (45)