diff --git a/matlab/get_param_by_name.m b/matlab/+get/param_by_name.m
similarity index 100%
rename from matlab/get_param_by_name.m
rename to matlab/+get/param_by_name.m
diff --git a/matlab/set_param_value.m b/matlab/+set/param_value.m
similarity index 100%
rename from matlab/set_param_value.m
rename to matlab/+set/param_value.m
diff --git a/matlab/+set/shock_stderr_value.m b/matlab/+set/shock_stderr_value.m
new file mode 100644
index 0000000000000000000000000000000000000000..f66e784ee5f4a73b8d4d0f2b740a1ee41b1599f5
--- /dev/null
+++ b/matlab/+set/shock_stderr_value.m
@@ -0,0 +1,28 @@
+function set_shock_stderr_value(exoname,value)
+
+% Copyright (C) 2019 Dynare Team
+%
+% This file is part of Dynare.
+%
+% Dynare 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.
+%
+% Dynare 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 Dynare.  If not, see <http://www.gnu.org/licenses/>.
+
+global M_
+
+i = strmatch(exoname,M_.exo_names,'exact');
+
+if isempty(i)
+    error(['Shock name ' exoname ' doesn''t exist'])
+end
+
+M_.Sigma_e(i,i) = value^2;