--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/+blockmatrix/getDivision.m	Fri Sep 07 14:40:58 2018 +0200
@@ -0,0 +1,42 @@
+function div = getDivision(bm)
+    if ~blockmatrix.isBlockmatrix(bm)
+        error('blockmatrix:getDivision:NotABlockmatrix', 'Input is not a blockmatrix');
+    end
+
+    if isempty(bm)
+        div = {[],[]};
+        return
+    end
+
+    div = {row_height(bm),col_width(bm)};
+end
+
+
+function m = col_width(C)
+    m = zeros(1,size(C,2));
+    for j = 1:size(C,2)
+        for i = 1:size(C,1)
+            if isNullMatrix(C{i,j})
+                continue
+            end
+            m(j) = size(C{i,j},2);
+        end
+    end
+end
+
+function n = row_height(C)
+    n = zeros(1,size(C,1));
+    for i = 1:size(C,1)
+        for j = 1:size(C,2)
+            if isNullMatrix(C{i,j})
+                continue
+            end
+            n(i) = size(C{i,j},1);
+        end
+    end
+end
+
+function b = isNullMatrix(A)
+    [n, m] = size(A);
+    b = n == 0 && m == 0;
+end