Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/6342#discussion_r33807633
--- Diff: python/pyspark/mllib/linalg.py ---
@@ -876,6 +881,50 @@ def __reduce__(self):
self.numRows, self.numCols, self.values.tostring(),
int(self.isTransposed))
+ def __str__(self):
+ """
+ Pretty printing of a DenseMatrix
+
+ >>> dm = DenseMatrix(2, 2, range(4))
+ >>> print(dm)
+ DenseMatrix([[ 0., 2.],
+ [ 1., 3.]])
+ >>> dm = DenseMatrix(2, 2, range(4), isTransposed=True)
+ >>> print(dm)
+ DenseMatrix([[ 0., 1.],
+ [ 2., 3.]])
+ """
+ # Inspired by __repr__ in scipy matrices.
+ array_lines = repr(self.toArray()).splitlines()
+
+ # We need to adjust six spaces which is the difference in number
+ # of letters between "DenseMatrix" and "array"
+ x = '\n'.join([(" " * 6 + line) for line in array_lines[1:]])
+ return array_lines[0].replace("array", "DenseMatrix") + "\n" + x
+
+ def __repr__(self):
+ """
+ Representation of a DenseMatrix
+
+ >>> dm = DenseMatrix(2, 2, range(4))
+ >>> dm
+ DenseMatrix(2, 2, [0.0, 1.0, 2.0, 3.0], False)
+ """
+ # If the number of values are less than seven then return as it is.
+ # Else return first three values and last three values.
+ if len(self.values) <= 6:
--- End diff --
`<= 6` -> `< 7` to match the comment, or you can change the comment
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