insert comma into this array so as to call each element individually-CodePudding

I have the following array to which I am trying to insert a comma between the numbers so that I can call each element individually, ie a[0]=-4.5e-2, a[1]=7.8e-3 etc

a = np.array(['-4.5e-2 7.8e-3 1e-2'])

Output

array([['-4.5e-2 7.8e-3 1e-2'],
       dtype='<U19')

Desired output

array([-4.5e-2, 7.8e-3, 1e-2])

CodePudding user response：

You can convert into dtype float64,

In [1]: np.array(['-4.5e-2 7.8e-3 1e-2'.split()]).astype('float64')
Out[1]: array([[-0.045 ,  0.0078,  0.01  ]])

Values are:

In [2]: -4.5e-2
Out[2]: -0.045

In [3]: 7.8e-3
Out[3]: 0.0078

In [4]: 1e-2
Out[4]: 0.01

If you want to represent it exact the same way you need to keep it as a Unicode string or string. Like this,

In [5]: np.array(['-4.5e-2 7.8e-3 1e-2'.split()])
Out[5]: array([['-4.5e-2', '7.8e-3', '1e-2']], dtype='<U7')