principal_coordinate# sectionproperties.analysis.fea.principal_coordinate(phi: float, x: float, y: float) → tuple[float, float][source]# Converts global coordinates to principal coordinates. Parameters: phi (float) – Principal bending axis angle, in degrees x (float) – x-coordinate in the global coordinate system y (float) – y-coordinate in the global coordinate system Returns: Principal axis coordinates (x11, y22) Return type: tuple[float, float]