larray.Array.drop

Array.drop(self, labels=None)

Return array without some labels or indices along an axis.

Parameters

labelsscalar, list or Group

Label(s) or group to remove. To remove indices, one must pass an IGroup.

Returns

Array

Array with labels removed along their axis.

Examples

>>> arr1 = ndtest((2, 4))
>>> arr1
a\b  b0  b1  b2  b3
 a0   0   1   2   3
 a1   4   5   6   7
>>> a, b = arr1.axes

dropping a single label

>>> arr1.drop('b1')
a\b  b0  b2  b3
 a0   0   2   3
 a1   4   6   7

dropping multiple labels

>>> # arr1.drop('b1,b3')
>>> arr1.drop(['b1', 'b3'])
a\b  b0  b2
 a0   0   2
 a1   4   6

dropping a slice

>>> # arr1.drop('b1:b3')
>>> arr1.drop(b['b1':'b3'])
a\b  b0
 a0   0
 a1   4

when deleting indices instead of labels, one must specify the axis explicitly (using an IGroup):

>>> # arr1.drop('b.i[1]')
>>> arr1.drop(b.i[1])
a\b  b0  b2  b3
 a0   0   2   3
 a1   4   6   7

as when deleting ambiguous labels (which are present on several axes):

>>> a = Axis('a=label0..label2')
>>> b = Axis('b=label0..label2')
>>> arr2 = ndtest((a, b))
>>> arr2
   a\b  label0  label1  label2
label0       0       1       2
label1       3       4       5
label2       6       7       8
>>> # arr2.drop('a[label1]')
>>> arr2.drop(a['label1'])
   a\b  label0  label1  label2
label0       0       1       2
label2       6       7       8