v = np.array([1,2,3])
In [17]: v.shape
Out[17]: (3,)
Why isn't the shape [,3]? Because it has only one row and three columns. Isn't it a row vector?
Asked
Active
Viewed 33 times
0
-
It's an 1d array. Arrays have no orientations. They just have Dimensions. – MSeifert Jul 29 '18 at 21:15
-
"They just have dimensions". Isn't the dimension "1 by 3"? – user697911 Jul 29 '18 at 21:25
-
There is no such thing as `(, 3)` in Python. See also [Difference between these array shapes in numpy](https://stackoverflow.com/q/27570756) and [why an extra comma in the shape of a single index numpy array](https://stackoverflow.com/q/46134891) – Jul 29 '18 at 21:52
-
Why just 1 by 3? Why not 1 by 1 by 3 by 1? Addi g those extra dimensions is just a convenience for humans. The code has no problems working with 1d arrays. Python lists are 1d. – hpaulj Jul 30 '18 at 00:17