--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/+scheme/+bc/verifyFormat.m	Thu Jan 17 10:44:12 2019 +0100
@@ -0,0 +1,31 @@
+% Errors with a more or less detailed error message if there is a problem with the bc specification
+function verifyBcFormat(bcs, diffOp)
+    assertType(bcs, 'cell');
+    for i = 1:length(bcs)
+        assertType(bcs{i}, 'struct');
+        assertStructFields(bcs{i}, {'type', 'boundary'});
+
+        if ~isfield(bcs{i}, 'data') || isempty(bcs{i}.data)
+            continue
+        end
+
+        if ~isa(bcs{i}.data, 'function_handle')
+            error('bcs{%d}.data should be a function of time or a function of time and space',i);
+        end
+
+        % Find dimension of boundary
+        b = diffOp.grid.getBoundary(bcs{i}.boundary);
+        dim = size(b,2);
+
+        % Assert that the data function has a valid number of input arguments
+        if ~(nargin(bcs{i}.data) == 1 || nargin(bcs{i}.data) == 1 + dim)
+            error('sbplib:scheme:bcSetup:DataWrongNumberOfArguments', 'bcs{%d}.data has the wrong number of input arguments. Must be either only time or time and space.', i);
+        end
+
+        if nargin(bcs{i}.data) == 1
+            % Grid data (only function of time)
+            % Assert that the data has the correct dimension
+            assertSize(bcs{i}.data(0), 1, size(b,1));
+        end
+    end
+end