# Numpy MaskedArray.swapaxes() function | Python

• Last Updated : 13 Oct, 2019

`numpy.MaskedArray.swapaxes() ` function is used to Return a view of the masked array with axis1 and axis2 interchanged.

Syntax : `numpy.ma.swapaxes(axis1, axis2)`

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Parameters:
axis1 :[int] First axis.
axis2 : [int] Second axis.

Return : [ swapped_array] Resultant array.

Code #1 :

 `# Python program explaining ` `# numpy.MaskedArray.swapaxes() 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([[``1``, ``2``], [ ``3``, ``-``1``], [ ``5``, ``-``3``]]) ` `print` `(``"Input array : "``, in_arr)  ` `   `  `# Now we are creating a masked array.  ` `# by making  entry as invalid.   ` `mask_arr ``=` `ma.masked_array(in_arr, mask ``=``[[ ``1``, ``0``], [ ``0``, ``1``], [ ``0``, ``0``]])  ` `print` `(``"Masked array : "``, mask_arr)  ` `   `  `# applying MaskedArray.swapaxes methods  ` `# to masked array  ` `out_arr ``=` `mask_arr.swapaxes(``0``, ``1``)  ` `print` `(``"Output swapped masked array : "``, out_arr)  `

Output:

```Input array :  [[ 1  2]
[ 3 -1]
[ 5 -3]]
[3 --]
[5 -3]]
Output swapped masked array :  [[-- 3 5]
[2 -- -3]]
```

Code #2 :

 `# Python program explaining ` `# numpy.MaskedArray.swapaxes() 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.swapaxes methods  ` `# to masked array ` `out_arr ``=` `mask_arr.swapaxes(``0``, ``2``)  ` `print` `(``"Output swapped 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 swapped masked array :  [[[-- -45.0]]

[[3e-05 200000.0]]]
```

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