new_contents: '''
  Learning
  1. tf.gather --> gathers elements from matrix, provided with indices
  2. tf.where --> compares element wise, and output the indices
  
  
  
  
  import tensorflow as tf
  
  sess = tf.Session()
  x = tf.constant([29.05088806,  27.61298943,  31.19073486,  29.35532951,
    				30.97266006,  26.67541885,  38.08450317,  20.74983215,
    				34.94445419,  34.45999146,  29.06485367,  36.01657104,
    				27.88236427,  20.56035233,  30.20379066,  29.51215172,
    				33.71149445,  28.59134293,  36.05556488,  28.66994858])
  
  print(sess.run(tf.gather(x, tf.where(x>30.,x=None,y=None))))
  
subject: Create tensorGathernCompare.py