Finding angle between two center points (vision)

[SaranVenkateshS]

Hi all,

   1.  i found a centre points two circles (x1,y1) and (x2,y2) . .. so i need to find the angle between these two points ,. i have used atan((y2-y1)/(x2-x1)) it is rad then i converted into deg.. 

   2 . the calculated degree -87 i am getting negative degree.. 

but in Vision assitand i am able to get 270 degree .. everything is perfect .. 

please help me to get solution for this . 

[GerdW]

Hi saran,

you know you can add 360° to your ~-90° to get your desired ~270°?

Simple math, eh!

[SaranVenkateshS]

Yes I did that .. is it possible to without doing 360 - 90

[GerdW]

Hi saran,

as atan is only defined in interval (-pi/2, +pi/2) you will always get results in range -90…90°.

Basic math knowledge, don't you think?

[SaranVenkateshS]

hi GerdW,

           okay i agree .. then what is the difference between atan2 and atan  ..

           how to use atan2(y,x) is y is (y2 - y1) and x is (x2 - x2)?

[GerdW]

Hi saran,

you aren't familiar with popular knowledge databases like Wikipedia?

Reading the LabVIEW help is also a great source of wisdom… Wow, it also links to an example VI in the example finder!