numpy and pandas

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Across
  1. 2. argument to drop and rename method of data frame which takes a Boolean value
  2. 3. to Find the position of the max element
  3. 5. to order the data of a dataFrame
  4. 7. subset the dataframe as an array
  5. 8. used for accessing rows based on row labels
  6. 9. used to filter a row
Down
  1. 1. 3d arrays can be converted to 2d arrays using this function
  2. 4. to add the row index as a column of a data frame
  3. 6. converts nXm matrix into mXn matrix