Average of deviation

[zoran]

Is there any code to calculate average deviation of 150 points with entering only starting and ending point so it would automatically add deviations of all 150 points and divide by 150?
From "LOC1.X.DEV to LOC150.X.DEV
I use 3.5 MR2
Thanks,
Zoran

[craiger_ny]

You could loop it into an array but the column width for an array is 256 chars.

[zoran]

Too many points for that.

[inspector212]

 
            ASSIGN/V4[1] = ARRAY(LOC18.MEAS,LOC19.MEAS,LOC20.MEAS,LOC21.MEAS,LOC22.MEAS,LOC23.MEAS,LOC24.MEAS)
            ASSIGN/V4[2] = ARRAY(LOC25.MEAS,LOC26.MEAS,LOC27.MEAS,LOC28.MEAS,LOC29.MEAS,LOC30.MEAS,LOC31.MEAS)
            ASSIGN/V4[3] = ARRAY(LOC32.MEAS,LOC33.MEAS,LOC34.MEAS,LOC35.MEAS,LOC36.MEAS,LOC37.MEAS,LOC38.MEAS)
            ASSIGN/V4[4] = ARRAY(LOC39.MEAS,LOC40.MEAS,LOC41.MEAS,LOC42.MEAS,LOC43.MEAS,LOC44.MEAS,LOC45.MEAS)
            ASSIGN/V4[5] = ARRAY(LOC46.MEAS,LOC47.MEAS,LOC48.MEAS,LOC49.MEAS,LOC50.MEAS,LOC51.MEAS,LOC52.MEAS)
            ASSIGN/V4[6] = ARRAY(LOC53.MEAS)
            ASSIGN/BBLENGTH_AVG = V4/36
F9         =GENERIC/POINT,DEPENDENT,CARTESIAN,$
            NOM/XYZ,<BBLENGTH_AVG,0,0>,$
            MEAS/XYZ,<BBLENGTH_AVG,-839.5005,518.8612>,$
            NOM/IJK,<0,0,1>,$
            MEAS/IJK,<0,0,1>
$$ NO,This is the everage length of the ballbar for programming use
DIM LOC55= LOCATION OF POINT F9  UNITS=MM ,$
GRAPH=OFF  TEXT=OFF  MULT=10.00  OUTPUT=NONE
AX       MEAS    NOMINAL       +TOL       -TOL        DEV     OUTTOL
X    684.0725   530.8423     0.0100     0.0100   153.2302   153.2202 ----------------->
END OF DIMENSION LOC55

[craiger_ny]

Does PCDMIS need to display this info?

You could send it to Datapage and get the average. You could send it to a text file and have Excell do the average. You could also write a script to do it but your naming convention would have to be hard coded. Unless you write them to a text file, then have your script open the text file and read them in then set a variable in your program through automation. Setting a variable would require hard coding as well though so you could have your script write it to a text file for PCDMIS to read in from.

I guess it all depends on what your goal is.

[zoran]

I need to use the average ot make an Off-set in the program itself.

[craiger_ny]

212 is creating a multidimensional array, that is a good way to do it. You could probably loop it to make it less code and more generic.

[Matthew D. Hoedeman]

I need to use the average ot make an Off-set in the program itself.

Why not just do a BEST-FIT or even an ITERATIVE alignment?

[spazus_maximus]

Im with 212. You could also use the variable for your offset...

[robehor4]

Can you just use a feature control set and tolerance the scan with max/min.

Of course this may not be the information you are looking for.

[zoran]

It’s little confusing, but I'll try to explain:

I use this program to make adjustment on the CNC, cutout line is on compound angle. It's working fine but instead me guessing how much off set to put it's easier if know the average. They can not move individual points, only the whole line. After they cut the part, I mark the nominal cutout line on the part(paint dots), than measure trim points along the actual cutout. Than from looking all the data I decide how much off set to put on each axis. Using the measured value of the trim points and assigned offset I simulate CNC cut with that offset and look how far will be from the nominal line. I change the offset until I get very close to the nominal line. All this is in the program and doesn't take that long to run it. It took me a while to write it. With knowing the average I can guess the offset quicker.

[zoran]

Thanks to all of you for the replies, lots of good ideas.

[Wingman]

Thanks to all of you for the replies, lots of good ideas.

What about a if loop adding the dev to a variable. Then divide the result by 150?

Something like:
Count = 1
v1=0
If count <=150
v1=v1+feat'count'.dev
count=count+1
end if
v2=v1/150

The actual code is a little diff but this would be generic for any number of points for any feature name.

[Jan d.]

I do this a lot and use something very similar to 212. It's a lot of typing, but once it is done, it runs very smoothly.


Jan.

[craiger_ny]

What about a if loop adding the dev to a variable. Then divide the result by 150?

Something like:
Count = 1
v1=0
If count <=150
v1=v1+feat'count'.dev
count=count+1
end if
v2=v1/150

So simple. Why that didn't occur to me I havn't the slightest. Something like that would probably be the best bet.