Which would be more compact representation for matrix:

message MatrixR
   repeated double mat;  // has to ensure that it passes values
correctly etc.


message RowVector
  required double rx = 1;
  required double ry = 2;
  required double rz = 3;
  required double rw = 4;

message Matrix
  required RowVector r0 = 1;
  required RowVector r1 = 2;
  required RowVector r2 = 3;
  required RowVector r3 = 4;

or any other efficient method?

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