[c++/m] Support DataArray expansionOrigin

Adds the set and setNone methods as well
as the get method via the description method
on the c++ side. Adds the dynamic attribute
on the matlab side and updates the attribute
test function accordingly.

Author: mpsonntag

+nix/DataArray.m

@@ -28,7 +28,7 @@
             nix.Dynamic.add_dyn_attr(obj, 'label', 'rw');
             nix.Dynamic.add_dyn_attr(obj, 'unit', 'rw');
             nix.Dynamic.add_dyn_attr(obj, 'expansionOrigin', 'rw');
-            nix.Dynamic.add_dyn_attr(obj, 'polynom_coefficients', 'rw');
+            nix.Dynamic.add_dyn_attr(obj, 'polynomCoefficients', 'rw');
             nix.Dynamic.add_dyn_attr(obj, 'shape', 'rw');
         end;
 

nix_mx.cc

@@ -209,6 +209,8 @@ void mexFunction(int            nlhs,
             .reg("setNoneLabel", SETTER(const boost::none_t, nix::DataArray, label))
             .reg("setUnit", SETTER(const std::string&, nix::DataArray, unit))
             .reg("setNoneUnit", SETTER(const boost::none_t, nix::DataArray, unit))
+            .reg("setExpansionOrigin", SETTER(double, nix::DataArray, expansionOrigin))
+            .reg("setNoneExpansionOrigin", SETTER(boost::none_t, nix::DataArray, expansionOrigin))
             .reg("dimensions", FILTER(std::vector<nix::Dimension>, nix::DataArray, , dimensions))
             .reg("appendSetDimension", &nix::DataArray::appendSetDimension)
             .reg("appendRangeDimension", &nix::DataArray::appendRangeDimension)

src/nixdataarray.cc

@@ -21,7 +21,7 @@ namespace nixdataarray {
 
     mxArray *describe(const nix::DataArray &da) {
         struct_builder sb({ 1 }, { "id", "type", "name", "definition", "label",
-            "shape", "unit", "polynom_coefficients" });
+            "shape", "unit", "expansionOrigin", "polynom_coefficients" });
 
         sb.set(da.id());
         sb.set(da.type());
@@ -30,6 +30,7 @@ namespace nixdataarray {
         sb.set(da.label());
         sb.set(da.dataExtent());
         sb.set(da.unit());
+        sb.set(da.expansionOrigin());
         sb.set(da.polynomCoefficients());
 
         return sb.array();

tests/TestDataArray.m

@@ -63,6 +63,13 @@
 
     da.label = '';
     assert(isempty(da.label));
+
+    assert(isempty(da.expansionOrigin));
+    da.expansionOrigin = 2.5;
+    assert(da.expansionOrigin == 2.5)
+    
+    da.expansionOrigin = '';
+    assert(isempty(da.expansionOrigin));
 end
 
 %% Test: Read all data from DataArray