diff --git a/interfaces/matlab/toolbox/ConstPressureReactor.m b/interfaces/matlab/toolbox/ConstPressureReactor.m
new file mode 100644
index 000000000..dff13aeed
--- /dev/null
+++ b/interfaces/matlab/toolbox/ConstPressureReactor.m
@@ -0,0 +1,16 @@
+function r = ConstPressureReactor(contents)
+% CONSTPRESSUREREACTOR - Create a ConstPressureReactor object.
+%
+%    A ConstPressureReactor is an instance of class Reactor where the pressure
+%    is held constant. The volume is not a state variable, but instead takes
+%    on whatever value is consistent with holding the pressure constant.
+%
+%        r1 = ConstPressureReactor         % an empty reactor
+%        r2 = ConstPressureReactor(gas)    % a reactor containing a gas
+%
+%   See also: Reactor
+%
+if nargin == 0
+    contents = 0;
+end
+r = Reactor(contents, 4);
diff --git a/interfaces/matlab/toolbox/IdealGasConstPressureReactor.m b/interfaces/matlab/toolbox/IdealGasConstPressureReactor.m
new file mode 100644
index 000000000..0f7024f3c
--- /dev/null
+++ b/interfaces/matlab/toolbox/IdealGasConstPressureReactor.m
@@ -0,0 +1,19 @@
+function r = IdealGasConstPressureReactor(contents)
+% IDEALGASCONSTPRESSUREREACTOR - Create an IdealGasConstPressureReactor object.
+%
+%    An IdealGasConstPressureReactor is an instance of class Reactor where the
+%    pressure is held constant. The volume is not a state variable, but
+%    instead takes on whatever value is consistent with holding the pressure
+%    constant. Additionally, its governing equations are specialized for the
+%    ideal gas equation of state (and do not work correctly with other
+%    thermodynamic models).
+%
+%        r1 = IdealGasConstPressureReactor      % an empty reactor
+%        r2 = IdealGasConstPressureReactor(gas) % a reactor containing a gas
+%
+%   See also: Reactor
+%
+if nargin == 0
+    contents = 0;
+end
+r = Reactor(contents, 6);
diff --git a/interfaces/matlab/toolbox/IdealGasReactor.m b/interfaces/matlab/toolbox/IdealGasReactor.m
new file mode 100644
index 000000000..478d0aa65
--- /dev/null
+++ b/interfaces/matlab/toolbox/IdealGasReactor.m
@@ -0,0 +1,16 @@
+function r = IdealGasReactor(contents)
+% IDEALGASREACTOR - Create an IdealGasReactor object.
+%
+%    An IdealGasReactor is an instance of class Reactor where the governing
+%    equations are specialized for the ideal gas equation of state (and do not
+%    work correctly with other thermodynamic models).
+%
+%        r1 = IdealGasReactor         % an empty reactor
+%        r2 = IdealGasReactor(gas)    % a reactor containing a gas
+%
+%   See also: Reactor
+%
+if nargin == 0
+    contents = 0;
+end
+r = Reactor(contents, 5);