From e4986047aec70a44cebdbb7b70d1d68005d10ceb Mon Sep 17 00:00:00 2001
From: Michel Juillard <michel.juillard@ens.fr>
Date: Wed, 11 Aug 2010 12:03:19 +0200
Subject: [PATCH] moments_varendo: compute variance decomposition only if there
 is more than one exogenous variable

---
 matlab/compute_moments_varendo.m | 36 +++++++++++++++++---------------
 1 file changed, 19 insertions(+), 17 deletions(-)

diff --git a/matlab/compute_moments_varendo.m b/matlab/compute_moments_varendo.m
index 77aa4484a..a9ee76959 100644
--- a/matlab/compute_moments_varendo.m
+++ b/matlab/compute_moments_varendo.m
@@ -94,31 +94,33 @@ else
     end
 end
 % VARIANCE DECOMPOSITION.
-if posterior
-    for i=1:NumberOfEndogenousVariables
-        for j=1:NumberOfExogenousVariables
-            oo_ = posterior_analysis('decomposition',var_list_(i,:),M_.exo_names(j,:),[],options_,M_,oo_);
-        end
-    end
-else
-    for i=1:NumberOfEndogenousVariables
-        for j=1:NumberOfExogenousVariables
-            oo_ = prior_analysis('decomposition',var_list_(i,:),M_.exo_names(j,:),[],options_,M_,oo_);
-        end
-    end        
-end
-% CONDITIONAL VARIANCE DECOMPOSITION.
-if Steps
+if M_.exo_nbr > 1
     if posterior
         for i=1:NumberOfEndogenousVariables
             for j=1:NumberOfExogenousVariables
-                oo_ = posterior_analysis('conditional decomposition',var_list_(i,:),M_.exo_names(j,:),Steps,options_,M_,oo_);
+                oo_ = posterior_analysis('decomposition',var_list_(i,:),M_.exo_names(j,:),[],options_,M_,oo_);
             end
         end
     else
         for i=1:NumberOfEndogenousVariables
             for j=1:NumberOfExogenousVariables
-                oo_ = prior_analysis('conditional decomposition',var_list_(i,:),M_.exo_names(j,:),Steps,options_,M_,oo_);
+                oo_ = prior_analysis('decomposition',var_list_(i,:),M_.exo_names(j,:),[],options_,M_,oo_);
+            end
+        end        
+    end
+    % CONDITIONAL VARIANCE DECOMPOSITION.
+    if Steps
+        if posterior
+            for i=1:NumberOfEndogenousVariables
+                for j=1:NumberOfExogenousVariables
+                    oo_ = posterior_analysis('conditional decomposition',var_list_(i,:),M_.exo_names(j,:),Steps,options_,M_,oo_);
+                end
+            end
+        else
+            for i=1:NumberOfEndogenousVariables
+                for j=1:NumberOfExogenousVariables
+                    oo_ = prior_analysis('conditional decomposition',var_list_(i,:),M_.exo_names(j,:),Steps,options_,M_,oo_);
+                end
             end
         end
     end