Fix for Matab versions older than R2013b.

src/utilities/cumulate/rcumprod.m

@@ -9,4 +9,8 @@ function Y = rcumprod(X)
 % OUTPUTS
 % - Y      [double]      T×N array
 
-Y = flip(cumprod(flip(X)));
\ No newline at end of file
+if isoctave() || matlab_ver_less_than('9.4')
+    Y = flipud(cumprod(flipud(X)));
+else
+    Y = cumprod(X, 'reverse');
+end
\ No newline at end of file

src/utilities/cumulate/rcumsum.m

@@ -9,4 +9,8 @@ function Y = rcumsum(X)
 % OUTPUTS
 % - Y      [double]      T×N array
 
-Y = flip(cumsum(flip(X)));
\ No newline at end of file
+if isoctave() || matlab_ver_less_than('9.4')
+    Y = flipud(cumsum(flipud(X)));
+else
+    Y = cumsum(X, 'reverse');
+end
\ No newline at end of file