docs: public static ZMatrixRMaj identity(int width , int height) {
          ZMatrixRMaj A = new ZMatrixRMaj(width,height);
  
          int m = Math.min(width,height);
          for (int i = 0; i < m; i++) {
              A.set(i,i,1,0);
          }
  
          return A;
      }