tightbinder.topology.count_crossings

count_crossings(wcc, midpoint, next_midpoint)

Routine to compute the number of WCC that lie between one midpoint and the next one. Used to determine the Z2 invariant.

Parameters:

• wcc (ndarray) – Array with WCCs for one closed path.

• midpoints – Value of midpoint of the current WCC array.

• next_midpoints – Value of midpoint of the consecutive array of WCCs.

Return type:

int

Returns:

Number of WCCs crossed when going from the present midpoint to the next one.