cf.bounds_combination_mode¶

cf.
bounds_combination_mode
(*arg)[source]¶ Determine how to deal with cell bounds in binary operations.
The flag returned by
cf.bounds_combination_mode()
is used to influence whether or not the result of a binary operation “op(x, y)”, such asx + y
,x = y
,x << y
, etc., will contain bounds, and if so how those bounds are calculated.The result of op(x, y) may only contain bounds if
x
is a construct that may contain bounds, orx
does not support the operation andy
is a construct that may contain bounds, e.g.2 + y
.
and so the flag only has an effect in these specific cases. Only dimension coordinate, auxiliary coordinate and domain ancillary constructs support bounds.
The behaviour for the different flag values is described by the following truth tables, for which it assumed that it is possible for the result of the operation to contain bounds:
If the flag is
'AND'
(the default) thenx
y
op(x, y)
Resulting bounds
has bounds
has bounds
has bounds
Yes
Yes
Yes
op(x.bounds, y.bounds)
Yes
No
No
No
Yes
No
No
No
No
If the flag is
'OR'
thenx
y
op(x, y)
Resulting bounds
has bounds
has bounds
has bounds
Yes
Yes
Yes
op(x.bounds, y.bounds)
Yes
No
Yes
op(x.bounds, y)
No
Yes
Yes
op(x, y.bounds)
No
No
No
If the flag is
'XOR'
thenx
y
op(x, y)
Resulting bounds
has bounds
has bounds
has bounds
Yes
Yes
No
Yes
No
Yes
op(x.bounds, y)
No
Yes
Yes
op(x, y.bounds)
No
No
No
If the flag is
'NONE'
thenx
y
op(x, y)
Resulting bounds
has bounds
has bounds
has bounds
Yes
Yes
No
Yes
No
No
No
Yes
No
No
No
No
New in version 3.8.0.
See also
 Parameters
 Returns
str
The value prior to the change, or the current value if no new value was specified.
Examples:
>>> old = cf.bounds_combination_mode() >>> print(old) AND >>> print(cf.bounds_combination_mode('OR')) AND >>> print(cf.bounds_combination_mode()) OR >>> print(cf.bounds_combination_mode(old)) OR >>> print(cf.bounds_combination_mode()) AND
Use as a context manager:
>>> print(cf.bounds_combination_mode()) AND >>> with cf.bounds_combination_mode('XOR'): ... print(cf.bounds_combination_mode()) ... XOR >>> print(cf.bounds_combination_mode()) AND