Warning with the intrinsic detrend function.

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noquinhas
noquinhas 2019-10-8
评论： noquinhas 2019-10-8
Hello,
I want to use the detrend function to remove the continuous quadratic trend but I keep getting this error:
Warning: Invalid trend type '2'.. assuming 'linear'.
> In detrend (line 52)
Even when I use the example provided here I get the same warning. My MATLAB version is R2018b.
Perhaps there is something I can do? I don't have any function overwritting this.
Thank you!

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Steven Lord
Steven Lord 2019-10-8
According to the Release Notes the ability to remove piecewise polynomial trends for higher degree polynomials was introduced in release R2019a. From the documentation for detrend in release R2018b the only allowed second inputs to the function in that release are 'constant' and 'linear'.
The online documentation is for the most recent release (currently release R2019b) and so may describe functionality not present in the release you're using if you're using an older release.

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