Singular matrix With your code

[tejastank]

Traceback (most recent call last):
File "RSSI_Localizer.py", line 269, in
p = o.getNodePosition([4, 2 , 3])
File "RSSI_Localizer.py", line 235, in getNodePosition
position = self.computePosition(a, b)
File "RSSI_Localizer.py", line 210, in computePosition
inv_at_a = numpy.linalg.inv(at_a)
File "/usr/lib/python3/dist-packages/numpy/linalg/linalg.py", line 513, in inv
ainv = _umath_linalg.inv(a, signature=signature, extobj=extobj)
File "/usr/lib/python3/dist-packages/numpy/linalg/linalg.py", line 90, in _raise_linalgerror_singular
raise LinAlgError("Singular matrix")
numpy.linalg.linalg.LinAlgError: Singular matrix

Default your code when try to run

accessPoints = [{
'signalAttenuation': 3,
'location': {
'y': 1,
'x': 1
},
'reference': {
'distance': 4,
'signal': -50
},
'name': 'dd-wrt'
},
{
'signalAttenuation': 4,
'location': {
'y': 1,
'x': 7
},
'reference': {
'distance': 3,
'signal': -41
},
'name': 'ucrwpa'
}]

print(accessPoints)
o = RSSI_Localizer(accessPoints)
p = o.getNodePosition([4, 2 , 3])

[jvillagomez]

Hi @tejastank., allow me to investigate what is going on here. Will report shortly.