fix casts in RangeDimension and allow for Matlab style indexing ...

(start with index 1) and add test cases

Author: jgrewe

+nix/RangeDimension.m

@@ -19,8 +19,11 @@
         end
 
         function tickAt = tick_at(obj, index)
+            if index > 0
+                index = index - 1;
+            end
             func_name = strcat(obj.alias, '::tick_at');
-            tickAt = nix_mx(func_name, obj.nix_handle, unit64(index));
+            tickAt = nix_mx(func_name, obj.nix_handle, uint64(index));
         end
 
         function indexOf = index_of(obj, position)
@@ -32,9 +35,12 @@
             if nargin < 3
                 startIndex = 0;
             end
+            if(startIndex > 0)
+                startIndex = startIndex - 1;
+            end
 
             func_name = strcat(obj.alias, '::axis');
-            axis = nix_mx(func_name, obj.nix_handle, unit64(count), uint64(startIndex));
+            axis = nix_mx(func_name, obj.nix_handle, uint64(count), uint64(startIndex));
         end
 
     end

tests/TestDimensions.m

@@ -95,7 +95,15 @@
     assert(isempty(d1.label));
     assert(isempty(d1.unit));
     assert(isequal(d1.ticks, ticks));
-    
+
+    axis = d1.axis(3, 0);
+    assert(axis(1) == ticks(1));
+    assert(length(axis) == 3);
+    assert(axis(end) == ticks(length(axis)));
+
+    assert(d1.tick_at(0) == ticks(1));
+    assert(d1.tick_at(3) == ticks(3));
+
     new_ticks = [5 6 7 8];
     d1.label = 'foo';
     d1.unit = 'mV';