numpy.MaskedArray.atleast_1d() function is used to convert inputs to masked arrays with at least one dimension.Scalar inputs are converted to 1-dimensional arrays, whilst higher-dimensional inputs are preserved.
Syntax :
numpy.ma.atleast_1d(*arys)Parameters:
arys:[ array_like] One or more input arrays.Return : [ ndarray] An array, or list of arrays, each with
arr.ndim >= 1
Code #1 :
# Python program explaining # numpy.MaskedArray.atleast_1d() method     # importing numpy as geek  # and numpy.ma module as ma import numpy as geek import numpy.ma as ma     # creating input arrays  in_arr1 = geek.array([[1, 2], [ 3, -1], [ 5, -3]]) print ("1st Input array : ", in_arr1)   in_arr2 = geek.array(2) print ("2nd Input array : ", in_arr2)     # Now we are creating masked array. # by making entry as invalid.  mask_arr1 = ma.masked_array(in_arr1, mask =[[ 1, 0], [ 0, 1], [ 0, 0]]) print ("1st Masked array : ", mask_arr1)   mask_arr2 = ma.masked_array(in_arr2, mask = 0) print ("2nd Masked array : ", mask_arr2)     # applying MaskedArray.atleast_1d methods # to masked array out_arr = ma.atleast_1d(mask_arr1, mask_arr2) print ("Output masked array : ", out_arr) |
Output:
1st Input array : [[ 1 2]
[ 3 -1]
[ 5 -3]]
2nd Input array : 2
1st Masked array : [[-- 2]
[3 --]
[5 -3]]
2nd Masked array : 2
Output masked array : [masked_array(
data=[[--, 2],
[3, --],
[5, -3]],
mask=[[ True, False],
[False, True],
[False, False]],
fill_value=999999), masked_array(data=[2],
mask=[False],
fill_value=999999)]
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Code #2 :
# Python program explaining # numpy.MaskedArray.atleast_1d() method      # importing numpy as geek  # and numpy.ma module as ma import numpy as geek import numpy.ma as ma      # creating input array in_arr = geek.array([[[ 2e8, 3e-5]], [[ -45.0, 2e5]]]) print ("Input array : ", in_arr)       # Now we are creating a masked array. # by making one entry as invalid.  mask_arr = ma.masked_array(in_arr, mask =[[[ 1, 0]], [[ 0, 0]]]) print ("3D Masked array : ", mask_arr)      # applying MaskedArray.atleast_1d methods # to masked array out_arr = ma.atleast_1d(mask_arr) print ("Output masked array : ", out_arr) |
Output:
Input array : [[[ 2.0e+08 3.0e-05]] [[-4.5e+01 2.0e+05]]] 3D Masked array : [[[-- 3e-05]] [[-45.0 200000.0]]] Output masked array : [[[-- 3e-05]] [[-45.0 200000.0]]]
