Autonomous Vehicle Engineering

The No. 1 media source for those developing the next generation mobility solutions.

World Pumps

Major news, innovation and real-life applications for pumps and ancillary equipment.

Chemical Engineering

The industry gateway for chemical engineering and plant operations.

Salary Expectation

8 things to know about the interview question "What's your salary expectation"?

more free magazines
Case 1:   exy > 0 and ex > ey
The principal axes are counterclockwise to the current axes (because exy > 0) and no more than 45º away (because ex > ey).

Case 2:   exy < 0 and ex > ey
The principal axes are clockwise to the current axes (because exy < 0) and no more than 45º away (because ex > ey).

Case 3:   exy > 0 and ex < ey
The principal axes are counterclockwise to the current axes (because exy > 0) and between 45º and 90º away (because ex < ey).

Case 4:   exy < 0 and ex < ey
The principal axes are clockwise to the current axes (because exy < 0) and between 45º and 90º away (because ex < ey).

Case 5:   exy = 0 and ex > ey
The principal axes are aligned with the current axes (because ex > ey and exy = 0).

Case 6:   exy = 0 and ex < ey
The principal axes are exactly 90° from the current axes (because ex < ey and exy = 0).