how to untilt my graphed data?
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Hello guys.
So I had some respiratory flow rate vs. time. I needed to find to graph volume of ventilation vs. time so I took the running integral of the flow rate data. However, taking this running integral results in volume data that is tilted. I need to untilt the data before analyzing it but I was unsure how to do it. The help would be greatly appreciated. I used cumtrapz to integrate the flow rate data.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/149263/image.jpeg)
Also, I attached an image of the graph as it may help.
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Star Strider
2015 年 4 月 20 日
It looks as though you are integrating a constant as well as your data. I don’t have your data so I can only suggest possible approaches.
The easiest approach would be to subtract the mean of ‘flow_data’ from ‘flow_data’ before you do the integration.
A more complicated approach would be to use a highpass or bandpass filter on the integrated data to eliminate the descending baseline.
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