v4 new function

git-svn-id: https://www.dynare.org/svn/dynare/dynare_v4@1647 ac1d8469-bf42-47a9-8791-bf33cf982152

matlab/get_param_by_name.m

+function x = get_param_by_name(pname)
+
+% function x = get_param_by_name(pname)
+% returns the value of a parameter identified by its name
+%  
+% INPUTS:
+%   pname:  parameter name
+%
+% OUTPUTS
+%   x:      parameter value
+%
+% SPECIAL REQUIREMENTS
+%   none
+%
+% part of DYNARE, copyright Dynare Team (2006-2008)
+% Gnu Public License  
+
+  global M_
+  
+  i = strmatch(pname,M_.param_names,'exact');
+  
+  if isempty(i)
+    error(['Can''t find parameter ' pname])
+  end
+  
+  x = M_.params(i);
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