diff --git a/matlab/estimation/dsge_likelihood.m b/matlab/estimation/dsge_likelihood.m
index 87689b61ef9eec2d5601db4dae1a1d3bf7f66bc6..50c7e8585cc35c19429489142c6ccc8f14e1a64a 100644
--- a/matlab/estimation/dsge_likelihood.m
+++ b/matlab/estimation/dsge_likelihood.m
@@ -789,7 +789,7 @@ if imag(LIK)~=0
     return
 end
 
-if isinf(LIK)~=0
+if isinf(LIK)
     fval = Inf;
     info(1) = 50;
     info(4) = 0.1;
diff --git a/matlab/estimation/dsge_var_likelihood.m b/matlab/estimation/dsge_var_likelihood.m
index ab6ab46131b0832d9bb55d29d0b8d32d61b61805..39eace525f281c007b2736ce47e792e8f1b537f5 100644
--- a/matlab/estimation/dsge_var_likelihood.m
+++ b/matlab/estimation/dsge_var_likelihood.m
@@ -303,7 +303,7 @@ if imag(fval)~=0
     return
 end
 
-if isinf(fval)~=0
+if isinf(fval)
     fval = Inf;
     info(1) = 50;
     info(4) = 0.1;
diff --git a/matlab/partial_information/PI_gensys.m b/matlab/partial_information/PI_gensys.m
index 02ed2fa6d79f94218c7a8bfc4d79c80f435adfb6..ec5b67a7975f226d0f5a6497c16a1efa399e4231 100644
--- a/matlab/partial_information/PI_gensys.m
+++ b/matlab/partial_information/PI_gensys.m
@@ -77,7 +77,7 @@ try
         warning('off','MATLAB:singularMatrix');
         UAVinv=inv(C2); % i.e. inv(U02'*a1*V02)
         [LastWarningTxt, LastWarningID]=lastwarn;
-        if any(any(isinf(UAVinv)))==1
+        if any(any(isinf(UAVinv)))
             singular=1;
         end
     end
diff --git a/matlab/partial_information/PI_gensys_singularC.m b/matlab/partial_information/PI_gensys_singularC.m
index da403d494aff832324a883d816673e3cd04e1d61..fbc77f3c5df7e34c9cac07e3b95b0ade053c1ce2 100644
--- a/matlab/partial_information/PI_gensys_singularC.m
+++ b/matlab/partial_information/PI_gensys_singularC.m
@@ -72,7 +72,7 @@ try
     else
         UAVinv=inv(C2);
         [LastWarningTxt, LastWarningID]=lastwarn;
-        if any(any(isinf(UAVinv)))==1
+        if any(any(isinf(UAVinv)))
             singular=1;
         end
     end
@@ -86,4 +86,4 @@ catch
     [errmsg, errcode]=lasterr;
     warning(['error callig PI_gensys_singularC: ' errmsg ],'errcode');
     error('errcode',['error callig PI_gensys_singularC: ' errmsg ]);
-end
\ No newline at end of file
+end