| T O P I C R E V I E W |
| anton_dys |
Posted - 02/10/2016 : 7:09:19 PM
Hello everyone!
Is there an easy way to tell Origin to measure the width of a negative peak (notch) at 3dB (two times) from the minimum value? Full width at twice minimum that is.
Many thanks in advance! |
| 4 L A T E S T R E P L I E S (Newest First) |
| anton_dys |
Posted - 02/13/2016 : 07:15:41 AM
Hello Ken and many thanks for your suggestions! I see that it can be done in a number of ways more or less manually. I just thought may be there is a checkbox or something in the peak analysis tools that can be turned on
for automatic measurement of a negative peak width (like measuring
FWHM of positive peaks). It would be very useful when, for example, one has many such notches and needs to know the average width.
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| KenLefebvre |
Posted - 02/12/2016 : 12:19:01 PM
Okay now I understand,one thing I'd recommend is trying the "Level Crossing App".
http://originlab.com/fileExchange/details.aspx?fid=225
In the settings tab you should be able to set the crossing level to be the y-value you're looking for and then you'll be able to find the width from the x-values in the output.
Of course if you're using an older version of the software that doesn't support apps, you could always set another column with the f(x) value set to the y-value you're looking for and do something similar with the Intersection gadget.
And if you are trying to calculate this within your worksheet, you could always look for the corresponding x/y-values and run this calculation manually, but if the specific y-value you're looking for is between the intervals of your actual data, then I would recommend some form of interpolation.
http://www.originlab.com/doc/LabTalk/guide/Interpolation
I'm sorry if I'm over-complicating this, let me know this still doesn't quite answer your question.
Regardless, I hope this helps!
Ken |
| anton_dys |
Posted - 02/11/2016 : 6:07:01 PM
Here's an example of what I mean. Perhaps I haven't just worded it carefully enough. |
| KenLefebvre |
Posted - 02/11/2016 : 09:07:48 AM
Hello Anton,
I'm not entirely sure I understand your question, do you mean twice the width at the baseline? I'm certain if you try the Quick Peaks Gadget, in Gadgets->Quick Peaks, set your parameters, and generate a new output, you'll find the figures you're looking for.
If I'm completely off the mark on this, let me know.
Best regards,
Ken Lefebvre
Technical Service Engineer
OriginLab |
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