diff --git a/interfaces/matlab/toolbox/1D/@Domain1D/setBounds.m b/interfaces/matlab/toolbox/1D/@Domain1D/setBounds.m
index f42243e13..04ddc1f82 100644
--- a/interfaces/matlab/toolbox/1D/@Domain1D/setBounds.m
+++ b/interfaces/matlab/toolbox/1D/@Domain1D/setBounds.m
@@ -1,4 +1,4 @@
-function d = setBounds(d, component, lower, upper)
+function setBounds(d, component, lower, upper)
 % SETBOUNDS -
 %
 n = componentIndex(d, component);
diff --git a/interfaces/matlab/toolbox/1D/@Domain1D/setCoverageEqs.m b/interfaces/matlab/toolbox/1D/@Domain1D/setCoverageEqs.m
index b1d56437a..849345d16 100644
--- a/interfaces/matlab/toolbox/1D/@Domain1D/setCoverageEqs.m
+++ b/interfaces/matlab/toolbox/1D/@Domain1D/setCoverageEqs.m
@@ -1,4 +1,4 @@
-function d = setCoverageEqs(d, onoff)
+function setCoverageEqs(d, onoff)
 % SETCOVERAGEEQS - Enable or disable solving the coverage equations.
 %
 if d.domain_type ~= 6
diff --git a/interfaces/matlab/toolbox/1D/@Domain1D/setFixedTempProfile.m b/interfaces/matlab/toolbox/1D/@Domain1D/setFixedTempProfile.m
index a6d3b8b90..9b8385905 100644
--- a/interfaces/matlab/toolbox/1D/@Domain1D/setFixedTempProfile.m
+++ b/interfaces/matlab/toolbox/1D/@Domain1D/setFixedTempProfile.m
@@ -1,4 +1,4 @@
-function d = setFixedTempProfile(d, profile)
+function setFixedTempProfile(d, profile)
 % SETFIXEDTEMPPROFILE - set the temperature profile to use when the
 % energy equation is not being solved. The profile must be entered
 % as an array of positions / temperatures, which may be in rows or
diff --git a/interfaces/matlab/toolbox/1D/@Domain1D/setID.m b/interfaces/matlab/toolbox/1D/@Domain1D/setID.m
index d83241be6..7f8300819 100644
--- a/interfaces/matlab/toolbox/1D/@Domain1D/setID.m
+++ b/interfaces/matlab/toolbox/1D/@Domain1D/setID.m
@@ -1,4 +1,4 @@
-function d = setID(d, id)
+function setID(d, id)
 % SETID - Set the ID tag for the domain.
 %
 domain_methods(d.dom_id, 54, id);
diff --git a/interfaces/matlab/toolbox/1D/@Domain1D/setMdot.m b/interfaces/matlab/toolbox/1D/@Domain1D/setMdot.m
index 49a575b11..b951bf2f4 100644
--- a/interfaces/matlab/toolbox/1D/@Domain1D/setMdot.m
+++ b/interfaces/matlab/toolbox/1D/@Domain1D/setMdot.m
@@ -1,4 +1,4 @@
-function d = setMdot(d, mdot)
+function setMdot(d, mdot)
 % SETMDOT -
 %
 domain_methods(d.dom_id, 60, mdot);
diff --git a/interfaces/matlab/toolbox/1D/@Domain1D/setMoleFractions.m b/interfaces/matlab/toolbox/1D/@Domain1D/setMoleFractions.m
index 03e5f22a5..6536c92e1 100644
--- a/interfaces/matlab/toolbox/1D/@Domain1D/setMoleFractions.m
+++ b/interfaces/matlab/toolbox/1D/@Domain1D/setMoleFractions.m
@@ -1,4 +1,4 @@
-function d = setMoleFractions(d, x)
+function setMoleFractions(d, x)
 % SETMOLEFRACTIONS -
 %
 domain_methods(d.dom_id, 62, x);
diff --git a/interfaces/matlab/toolbox/1D/@Domain1D/setPressure.m b/interfaces/matlab/toolbox/1D/@Domain1D/setPressure.m
index 7e5a09f2e..f96ffad8b 100644
--- a/interfaces/matlab/toolbox/1D/@Domain1D/setPressure.m
+++ b/interfaces/matlab/toolbox/1D/@Domain1D/setPressure.m
@@ -1,4 +1,4 @@
-function d = setPressure(d, p)
+function setPressure(d, p)
 % SETPRESSURE -
 %
 domain_methods(d.dom_id, 63, p);
diff --git a/interfaces/matlab/toolbox/1D/@Domain1D/setProfile.m b/interfaces/matlab/toolbox/1D/@Domain1D/setProfile.m
index b20cc5545..9087ac1bc 100644
--- a/interfaces/matlab/toolbox/1D/@Domain1D/setProfile.m
+++ b/interfaces/matlab/toolbox/1D/@Domain1D/setProfile.m
@@ -1,4 +1,4 @@
-function d = setProfile(d, n, p)
+function setProfile(d, n, p)
 % SETPROFILE -
 %
 if d.stack == 0
diff --git a/interfaces/matlab/toolbox/1D/@Domain1D/setSteadyTolerances.m b/interfaces/matlab/toolbox/1D/@Domain1D/setSteadyTolerances.m
index b49b6685f..8640aa891 100644
--- a/interfaces/matlab/toolbox/1D/@Domain1D/setSteadyTolerances.m
+++ b/interfaces/matlab/toolbox/1D/@Domain1D/setSteadyTolerances.m
@@ -1,4 +1,4 @@
-function d = setSteadyTolerances(d, component, rtol, atol)
+function setSteadyTolerances(d, component, rtol, atol)
 % SETSTEADYTOLERANCES -
 %
 
diff --git a/interfaces/matlab/toolbox/1D/@Domain1D/setTemperature.m b/interfaces/matlab/toolbox/1D/@Domain1D/setTemperature.m
index d2412586f..5263b5184 100644
--- a/interfaces/matlab/toolbox/1D/@Domain1D/setTemperature.m
+++ b/interfaces/matlab/toolbox/1D/@Domain1D/setTemperature.m
@@ -1,4 +1,4 @@
-function d = setTemperature(d, t)
+function setTemperature(d, t)
 % SETTEMPERATURE - Set the temperature [K].
 %
 domain_methods(d.dom_id, 61, t);
diff --git a/interfaces/matlab/toolbox/1D/@Domain1D/setTransientTolerances.m b/interfaces/matlab/toolbox/1D/@Domain1D/setTransientTolerances.m
index 6f23352ce..85a54ec90 100644
--- a/interfaces/matlab/toolbox/1D/@Domain1D/setTransientTolerances.m
+++ b/interfaces/matlab/toolbox/1D/@Domain1D/setTransientTolerances.m
@@ -1,4 +1,4 @@
-function d = setSteadyTolerances(d, component, rtol, atol)
+function setSteadyTolerances(d, component, rtol, atol)
 % SETSTEADYTOLERANCES -
 %
 
diff --git a/interfaces/matlab/toolbox/1D/@Domain1D/setupGrid.m b/interfaces/matlab/toolbox/1D/@Domain1D/setupGrid.m
index bf50c5706..de65e2409 100644
--- a/interfaces/matlab/toolbox/1D/@Domain1D/setupGrid.m
+++ b/interfaces/matlab/toolbox/1D/@Domain1D/setupGrid.m
@@ -1,4 +1,4 @@
-function d = setupGrid(d, grid)
+function setupGrid(d, grid)
 % SETUPGRID -
 %
 domain_methods(d.dom_id, 53, grid);
diff --git a/interfaces/matlab/toolbox/1D/@Stack/setRefineCriteria.m b/interfaces/matlab/toolbox/1D/@Stack/setRefineCriteria.m
index d19affb3a..ed6bd5740 100644
--- a/interfaces/matlab/toolbox/1D/@Stack/setRefineCriteria.m
+++ b/interfaces/matlab/toolbox/1D/@Stack/setRefineCriteria.m
@@ -1,4 +1,4 @@
-function s = setRefineCriteria(s, n, ratio, slope, curve, prune)
+function setRefineCriteria(s, n, ratio, slope, curve, prune)
 % SETREFINECRITERIA - Set the criteria used to refine the grid.
 %
 %     n  --  domain number beginning with domain 1 at the left