如何创建一个二维数组，其中一列为1到n，另一列为零-Python

Question

I tried creating two arrays and then adding them together

array_nmax = np.arange (100)
array_zeros = np.zeros (100, dtype = np.int)
array_final = np.append (array_nmax,np.zeros, axis = 0)

but it says that they're not the same dimensions even though they should be both 100 by 1 arrays.

Answer 1

Maybe something like this?

a = np.zeros((100, 10), dtype=np.int)
a[:, 0] = np.arange(0, 100)

Answer 2

Slower than @GrigorisG's answer and not so readable, but still a possible solution:

np.arange(100)[:,None] * [1,0]

By the way, there are two problems in your solution. The first one is that, by mistake, the second argument to concatenate is the function np.zeros instead of the newly created array array_zeros . Even after fixing this, the second problem is that the two arrays will be concatenated along their zero-th dimension and the result will be an array of shape (200,) . You should use np.column_stack as suggested by @Divakar.