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Clarify that cross() returns connections in default infinite mask #30

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Clarify that cross() returns connections in default infinite mask #30

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16 changes: 16 additions & 0 deletions csa/elementary.py
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Original file line number Diff line number Diff line change
Expand Up @@ -71,6 +71,22 @@ def ival (beg, end):
# Cartesian product
#
def cross (set0, set1):
"""
Compute the Cartesian product of two sets.

Note
----
The Cartesian product returned by `cross()` is not automatically
restricted to a finite mask. When visualized using `show()`,
connections may appear in the default (infinite) mask unless
explicitly multiplied with a finite mask.

Example
-------
# To obtain a bounded all-to-all connectivity pattern:
cross(A, B) * full(len(A), len(B))
"""

return _cs.intervalSetMask (set0, set1)

# Elementary masks
Expand Down