Minimum Distance between Two curves on a X-Y plane

[VenkateshMurthy]

Is there any inbuilt DIAdem function/command to find out the minimum distance between two curves on a 2 D Axis plot? If so, what is it? Otherwise please suggest me the best method to get the value.

[Walter_Rick]

Hi,

I hope the following script can help you:


sResultChn = MyResultChn
sTimeChn = MyTimeChn

call FormulaCalc("Ch('ChnRes'):= Abs(Ch('[1]/Geschwindigkeit')-Ch('[1]/Drehmoment'))")
iMinValue = ChnPropGet(sResultChn, "minimum")
iPosOfMinValue = pno(sResultChn, iMinValue)
sValOfTimeChn = chd(iPosOfMinValue, sTimeChn) 


Greetings
Walter

[AndreasH_Ha]

Do you refer to the distance in Y direction only ? Or do you refer to the distance in the xy-plane ?

Andreas

P.S. If its the distance in Y-direction than Walters answer is a perfect fit

[VenkateshMurthy]

Hi Andreas,

   Yes, I meant only in the Y direction. Thanks a lot.

Regards,

Venkatesh

[VenkateshMurthy]

Hi Walter,

 Thanks for your instant reply. I have a problem though - one set of Y values(array 1, say) has only 4 or 5 points(not a smooth curve) while the other(array 2, say) has 101 points, though both are plotted to the same X-Y scales.  Hence I need to subtract only values corresponding to those 4 or 5 points of array 1. So I cannot pick up the values from the two arrays one to one. How do I do it then?

Regards,
Venkatesh.

[Walter_Rick]

Hi Venkatesh,

In that case you must map the longer channel to the smaller one. You can do that with the "Linear mapping" function in the toolbar "Curve fitting". X and Y channel are the long channels and the "Interpolation channel" is the X channel from the smaller one. After that you can use the script above.

Greetings
Walter

[VenkateshMurthy]

Hi Walter,

     Thanks a lot for your suggestions. The script works perfectly after the linear mapping, and my problem has been solved.

Warm regards,

Venkatesh.