Experimental Physics and
Industrial Control System

Zenon Szalata <[email protected]> · Tue, 17 Jun 2014 12:27:23 -0700

Hi,

I am developing an IOC to fit data using Chi Square fitting routine.

This is working well. I don't understand why the EDM x-y graph widget

is showing one extra point, see attachment.

Here are the test data that is being fitted with a quadratic function:
-1.7237128     23.095947     0.2
-1.3703436     15.971818     0.2
-0.96608055    10.204468     0.2
-0.28394297     5.40507      0.2
-0.14970151     4.9337711    0.2
 0.042581975    4.7668524    0.2
 0.82065094     8.7348375    0.2
 1.3416969     15.787588     0.2
 1.3757038     16.520903     0.2
 1.8712276     26.449392     0.2
 where the first column is x, second is y, and third is error on y.

The EDM graph shows the y data points as circles (red) and the fitted

curve (blue).

I have three waveform records of type FLOAT and NELM 1000. When these

waveforms are filled with data, NORD is 10 in each record.

Why is the widget showing 11 point when NORD is 10?
I don't know how to make it not show the 11th point at (0,0).
Can it be done by changing some parameter in EDM?

I see this behavior in an older version of EDM as well as in version

1-12-96.

Any suggestions will be welcome.
Thanks,
Zen

quadFit.png

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System