[Python] How to apply scipy filter in Polars DataFrame

I'm currently using savgol filter in my DataFrame, which has 3 columns x, y, z With float values of a signal from a micro controller

in pandas it's straight forward

df["x"] = savgol_filter(df["x"], 51, 1)
df["y"] = savgol_filter(df["y"], 51, 1)
df["z"] = savgol_filter(df["z"], 51, 1)


how to implement the same in polars

I tried using this method

df.with_columns(
(savgol_filter(df["x"], 51, 1)).alias("x"),
(savgol_filter(df["y"], 51, 1)).alias("y"),
(savgol_filter(df["z"], 51, 1)).alias("`"),
)


The above code returns Attribute error. AttributeError: 'numpy.ndarray' object has no attribute 'alias'

Edit: My question is fairly simple, what is the right syntax/method to implement a scipy filters in polars DataFrame?.

Continue reading...