Select certain rows (condition met), but only some columns in Python/Numpy

Question

I have an numpy array with 4 columns and want to select columns 1, 3 and 4, where the value of the second column meets a certain condition (i.e. a fixed value). I tried to f

Answer 1

>>> a=np.array([[1,2,3], [1,3,4], [2,2,5]])
>>> a[a[:,0]==1][:,[0,1]]
array([[1, 2],
       [1, 3]])
>>>