[Eeglablist] Down Sampling Issue

[Andreas Widmann]

Hi Jazmin,

> Error using upfirdn>validateinput (line 129)
> The product of the downsample factor Q and the upsample factor P must be less than 2^31.
This is unexpected for downsampling from 512 to 128 Hz. p and q should be 1 and 4. Is the current sampling rate possibly non-integer for some reason?

> Although I have not faced any issues with this previously, I am currently receiving the following error on my present datasets:
Do I understand correctly that the problem affects *all* your recent datasets? Does resampling still work on your older datasets (where you didn't perceive issues previously)?

Could you please provide:
* EEGLAB and MATLAB versions
* a short sample dataset demonstrating the problem
* command line code in case you use CLI or script
* confirm that you have MATLAB signal processing toolbox installed

Best,
Andreas

> Am 22.05.2023 um 23:33 schrieb Jazmin Morrone via eeglablist <eeglablist at sccn.ucsd.edu>:
> 
> Hello,
> 
> 
> I am currently preprocessing data in EEGLab, whereby I am resampling from 512 Hz to 128 Hz. Although I have not faced any issues with this previously, I am currently receiving the following error on my present datasets:
> 
> Error using upfirdn>validateinput (line 129)
> The product of the downsample factor Q and the upsample factor P must be less than 2^31.
> 
> 
> As I have attempted various methods to navigate this without any luck (e.g., up-sampling, filtering, then down-sampling), any assistance would be greatly appreciated!
> 
> Kind regards,
> 
> Jazmin Morrone
> 
> MRes - Cognitive Neuroscience
> 
> Lecturer and Technical Services
> 
> Faculty of Sports Allied Health and Performance Sciences
> 
> St Mary's University
> 
> Waldegrave Road
> 
> Twickenham
> 
> TW1 4SX
> 
> ****************************************************************** Disclaimer This email may contain privileged, proprietary, or otherwise private information and is intended solely for the individual to whom it is addressed. If you are not the intended recipient, we are sorry that you have received this email in error. Please note that any use, dissemination, forwarding, printing, or copying is strictly prohibited. Please contact the sender, do not open any attachments, and delete the email immediately. Any views and opinions are those of the individual sender and not necessarily those of St Mary's University Twickenham. Please rely on your own anti-malware software. No responsibility is taken by the sender for any damage rising out of any infection. We reserve the right to monitor e-mail messages passing through our network as permitted under UK law. ******************************************************************
> _______________________________________________
> Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
> To unsubscribe, send an empty email to eeglablist-unsubscribe at sccn.ucsd.edu
> For digest mode, send an email with the subject "set digest mime" to eeglablist-request at sccn.ucsd.edu