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Issue with Filter in Altair Compose

Dear Team,

I am working in Altair Compose, and I am experiencing an issue with the filtering behavior. Specifically, the filter command appears to be working (i.e., it is being recognized as saefilter 180 and applied to the curve), but the results in certain parts of my compose chart are not as expected. Some layers are not properly affected by the filter. Are there specific steps I should follow to ensure filters are applied correctly to all components in Altair Compose?

Best Regards,
Mugundhan J.

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Accepted answers

RSGarciarivas

hi @Mugundhan03,

The time vector should remain the same. Try plotting the filtered signal vs. time. Taht might fix your issue.

Rafael

RSGarciarivas

I see the green curve goes back from a value greater than 8 on the x-axis to a value smaller than 5. This makes me think that the time vector is not properly ordered.

I suggest you handle all signal declarations in the same script to sort this out and also clear your environment at the beginning of the script. Use command "clear" for that. Signal "Time" might have been corrupted by previous script runs without you noticing.

All comments

RSGarciarivas

hi @Mugundhan03,

The time vector should remain the same. Try plotting the filtered signal vs. time. Taht might fix your issue.

Rafael

Mugundhan03

Hi @RSGarciarivas ,

Thank you for the suggestion. I did try plotting the filtered signal against the original time vector as advised, but unfortunately the results are still inaccurate. The filtered signal does not properly align with the time axis, and the output appears distorted compared to what’s expected.

If you have any additional troubleshooting ideas or insight into possible causes for this mismatch, I’d really appreciate your input.

Best Regards,

Mugundhan J.

RSGarciarivas

I see the green curve goes back from a value greater than 8 on the x-axis to a value smaller than 5. This makes me think that the time vector is not properly ordered.