PCA on all data:
PCA SUMMARY

Center:

    sepal length       sepal width      petal length       petal width  
          5.8433            3.0540            3.7587            1.1987  

Deviation:

    sepal length       sepal width      petal length       petal width  
          0.8253            0.4321            1.7585            0.7606  

Importance of components:

  eigenvalues     proportion     cumulative
       3.1416         0.7854         0.7854
       0.7317         0.1829         0.9683

PCA on attributes sepal.length, sepal.width, petal.length, petal.width:
PCA SUMMARY

Center:

    sepal length       sepal width      petal length       petal width  
          5.8433            3.0540            3.7587            1.1987  

Deviation:

    sepal length       sepal width      petal length       petal width  
          0.8253            0.4321            1.7585            0.7606  

Importance of components:

  eigenvalues     proportion     cumulative
       2.9108         0.7277         0.7277
       0.9212         0.2303         0.9580

PCA on every second row:
PCA SUMMARY

Center:

    sepal length       sepal width      petal length       petal width  
          5.8400            3.0640            3.7760            1.2173  

Deviation:

    sepal length       sepal width      petal length       petal width  
          0.8005            0.4326            1.7710            0.7873  

Importance of components:

  eigenvalues     proportion     cumulative
       3.2310         0.8078         0.8078
       0.6101         0.1525         0.9603

