What does the c underscore expression `c_` do exactly?

Question

It seems to be some kind of horizontal concatenation, but I could not find any documentation online. Here a minimal working example:

In [1]: from numpy impo         


        

Answer 1

np.c_[[1,4,5,4,5,3],[1,4,2,4,5,3],[2,4,6,8,9,0]]..This Concats The Arrays Horizontal or Say By Axis 0.So The Array Will be

array([[1, 1, 2],
       [4, 4, 4],
       [5, 2, 6],
       [4, 4, 8],
       [5, 5, 9],
       [3, 3, 0]])

To Determine The Rows, Total Elements/Total no Of Arrays

(i.e 18/3) [{len([1,4,5,4,5,3])}+{len([1,4,5,4,5,3])}+{len([2,4,6,8,9,0])}]//len([[1,4,5,4,5,3],[1,4,2,4,5,3],[2,4,6,8,9,0]])

So The Aboove One Gives 6..SO 6 rows will be there.

For No of Colums, Total Elements/len(any one array inside the array)

for eg 18/len([1,4,5,4,5,3])

So The Columns will be 18/6 and That is 3.