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potential.py
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Created
Thu, Sep 5, 21:22
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1 KB
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text/x-python
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Sat, Sep 7, 21:22 (2 d)
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blob
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20528566
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R6746 RationalROMPy
potential.py
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# Copyright (C) 2018-2020 by the RROMPy authors
#
# This file is part of RROMPy.
#
# RROMPy is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# RROMPy is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with RROMPy. If not, see <http://www.gnu.org/licenses/>.
#
import
numpy
as
np
from
rrompy.utilities.base.types
import
Tuple
,
Np1D
from
rrompy.utilities.exception_manager
import
RROMPyWarning
__all__
=
[
'potential'
]
def
potential
(
x
:
Np1D
,
foci
:
Tuple
[
float
,
float
]
=
[
-
1.
,
1.
])
->
Np1D
:
"""Evaluation of complex potential for ellipses or line segments."""
mu0
=
np
.
mean
(
foci
)
musig
=
foci
[
0
]
-
mu0
xFinite
=
np
.
isinf
(
x
)
==
False
dist
=
np
.
empty
(
len
(
x
))
dist
[
xFinite
==
False
]
=
np
.
inf
xEffR
=
x
[
xFinite
]
-
mu0
if
np
.
isclose
(
musig
,
0.
,
atol
=
1e-15
):
if
foci
[
0
]
!=
foci
[
1
]:
RROMPyWarning
(
"Collapsing different but numerically equal foci."
)
dist
[
xFinite
]
=
np
.
abs
(
xEffR
)
else
:
xEffR
/=
musig
bernEff
=
(
xEffR
**
2.
-
1
)
**
.
5
dist
[
xFinite
]
=
np
.
max
(
np
.
vstack
((
np
.
abs
(
xEffR
+
bernEff
),
np
.
abs
(
xEffR
-
bernEff
))),
axis
=
0
)
return
dist
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