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What does (13, ) mean here? without column?

Leon
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    Does this answer your question? [Difference between numpy.array shape (R, 1) and (R,)](https://stackoverflow.com/questions/22053050/difference-between-numpy-array-shape-r-1-and-r) – Iker Nov 12 '21 at 15:47
  • It's the same as `(5, 1)`. See [this post](https://stackoverflow.com/questions/22053050/difference-between-numpy-array-shape-r-1-and-r) for more details. –  Nov 12 '21 at 15:47
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    @user17242583, when `broadcasting` a (5,) behaves more like a (1,5) than a (5,1). – hpaulj Nov 12 '21 at 16:39

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