Added condition (input must be a string) in isyearly, isquaterly, ismonthly and isweekly functions.

matlab/utilities/dates/ismonthly.m

@@ -25,7 +25,11 @@ function b = ismonthly(str)  % --*-- Unitary tests --*--
 % You should have received a copy of the GNU General Public License
 % along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
 
-b = ~isempty(regexp(str,'^-?[0-9]*[Mm]([1-9]|1[0-2])$'));
+if ischar(str)
+    b = ~isempty(regexp(str,'^-?[0-9]*[Mm]([1-9]|1[0-2])$'));
+else
+    b = 0;
+end
 
 %@test:1
 %$

matlab/utilities/dates/isquaterly.m

@@ -25,7 +25,11 @@ function b = isquaterly(str)  % --*-- Unitary tests --*--
 % You should have received a copy of the GNU General Public License
 % along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
 
-b = ~isempty(regexp(str,'^-?[0-9]*[Qq][1-4]$'));
+if ischar(str)    
+    b = ~isempty(regexp(str,'^-?[0-9]*[Qq][1-4]$'));
+else
+    b = 0;
+end
 
 %@test:1
 %$

matlab/utilities/dates/isweekly.m

@@ -25,7 +25,11 @@ function b = isweekly(str)  % --*-- Unitary tests --*--
 % You should have received a copy of the GNU General Public License
 % along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
 
-b = ~isempty(regexp(str,'^-?[0-9]*[Ww]([1-9]|[1-4][0-9]|5[0-2])$'));
+if ischar(str)
+    b = ~isempty(regexp(str,'^-?[0-9]*[Ww]([1-9]|[1-4][0-9]|5[0-2])$'));
+else
+    b = 0;
+end
 
 %@test:1
 %$

matlab/utilities/dates/isyearly.m

@@ -25,7 +25,11 @@ function b = isyearly(str)  % --*-- Unitary tests --*--
 % You should have received a copy of the GNU General Public License
 % along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
 
-b = ~isempty(regexp(str,'^-?[0-9]*[YyAa]$'));
+if ischar(str)
+    b = ~isempty(regexp(str,'^-?[0-9]*[YyAa]$'));
+else
+    b = 0;
+end
 
 %@test:1
 %$