provide and use Datafield::setVector2D

Device/Data/Datafield.cpp

@@ -132,12 +132,7 @@ Datafield::Datafield(const std::string& xlabel, const std::string& ylabel,
                 newEquiDivision(ylabel, nrows, 0.0, (double)nrows)};
     m_frame.reset(new Frame(std::move(axes)));
 
-    m_values.reserve(nrows * ncols);
-    for (size_t j = 0; j < nrows; ++j) {
-        ASSERT(vec[j].size() == ncols);
-        for (size_t i = 0; i < ncols; ++i)
-            m_values.push_back(vec[j][i]);
-    }
+    setVector2D(vec);
 }
 
 Datafield::Datafield(Datafield&&) noexcept = default;
@@ -213,6 +208,21 @@ void Datafield::setVector(const std::vector<double>& vector)
     m_values = vector;
 }
 
+void Datafield::setVector2D(const std::vector<std::vector<double>>& in)
+{
+    const size_t ncols = axis(0).size();
+    const size_t nrows = axis(1).size();
+
+    ASSERT(in.size() == nrows);
+    m_values.clear();
+    m_values.reserve(nrows * ncols);
+    for (size_t j = 0; j < nrows; ++j) {
+        ASSERT(in[j].size() == ncols);
+        for (size_t i = 0; i < ncols; ++i)
+            m_values.push_back(in[j][i]);
+    }
+}
+
 size_t Datafield::rank() const
 {
     return frame().rank();

Device/Data/Datafield.h

@@ -147,6 +147,7 @@ public:
 
     //! Sets new values to raw data vector.
     void setVector(const std::vector<double>& data_vector);
+    void setVector2D(const std::vector<std::vector<double>>& in);
 
     bool hasErrorSigmas() const;
     std::vector<double>& errorSigmas();