| T O P I C R E V I E W |
| mssm22 |
Posted - 01/01/2013 : 5:45:38 PM
Origin Ver. and Service Release (Select Help-->About Origin):
Operating System:
origin 8.6G on windows XP
Hi,
I divided a large data set into smaller ones of 16384 points. Next I want to calculate the power spectrum of each of the data sets. Since I have 20 of such smaller sets, it is time consuming to every time access the drop down menu and choose FTT and so on. I tried to choose all the sets (columns) as input in the FTT dialog box. Yet instead of getting 20 spectra, I end up with one spectrum. Origin just sums the data sets once again into one set! Is there a way around that
Thanks in advance
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| 4 L A T E S T R E P L I E S (Newest First) |
| mssm22 |
Posted - 01/02/2013 : 7:39:19 PM
@ easwar
Thanks for the tip. I will try that as well.
Regards
M |
| mssm22 |
Posted - 01/02/2013 : 7:32:42 PM
thanks, that worked well. |
| easwar |
Posted - 01/02/2013 : 5:58:19 PM
Hi,
If you are really looking to see how the frequency spectrum changes with time slices, you may want to also consider the STFT tool, which is available in OriginPro:
http://originlab.com/index.aspx?go=Products/Origin/DataAnalysis/SignalProcessing/STFT
Easwar
OriginLab |
| greg |
Posted - 01/02/2013 : 10:02:23 AM
You could use a LabTalk script...
Assuming your data is organized as one X column and multiple Y columns, your script could look like:
loop(ii,2,wks.ncols)
{
fft1 ix:=1!$(ii) norma:=1 re:=0 im:=0 ap:=0 ri:=0 mag:=0 db:=0 rt:=<optional>;
}
Consult the X-Function documentation for help with the fft1 options. The above example only outputs Frequency and Power for each Y column. |
