[REQUEST] is_line() function and others are not available in Python.

[anachristinaac]

Request description: Functions to check some properties of the DQ elements are not available in Python, such as is_line(), is_plane(), is_pure(), and is_unit(). However, they are available in Matlab. Is it possible to include them?

Other functions that are also available in Matlab but not in Python: is_pure_quaternion(), is_quaternion(), is_real(), is_real_number().

Minimal example in Matlab: Code

a  = DQ([1, 0, 0, 0, 0, 0, 0]);
is_line(a)

Output

ans =
    0

Expected behavior in Python: I would expect the same behavior in Python. For instance:

Code

from dqrobotics import *
a = DQ([1, 0, 0, 0, 0, 0, 0])
is_line(a)

Expected output:

0

Environment: OS Ubuntu 18.04 dqrobotics version 19.10.0.42 Python version 3.6.7 Matlab version R2018a

[mmmarinho]

Hello, @anachristinaac.

Thanks for the report.

The following should work now:

from dqrobotics import *

h = DQ([1, 0, 0, 0, 0, 0, 0, 0])

print('Is h unit', is_unit(h))
print('Is h pure?', is_pure(h))
print('Is h real?', is_real(h))
print('Is h a real number?', is_real_number(h))
print('Is h a quaternion?', is_quaternion(h))
print('Is h a pure quaternion?', is_pure_quaternion(h))
print('Is h a plane?', is_plane(h))

Output:

Is h unit? True
Is h pure? False
Is h real? True
Is h a real number? True
Is h a quaternion? True
Is h a pure quaternion? False
Is h a plane? True

[anachristinaac]

Hi, @mmmarinho. It's working. Thanks!