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Using polyfit in two arrays to detrend data.

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Fabian
Fabian 2023-6-13
评论： Fabian 2023-6-16
I have two 5x1 arrays (x and y oth come from one data table) and need to use them to detrend a data set. My line of code to do so is below. I keep getting the error of "arrays have incompatible array sizes for this operation." My question is, what can I do to make the array sizes work with the polyfit?
data_detrend = data-polyfit(x,y,4)

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采纳的回答

Matt J
Matt J 2023-6-14
编辑：Matt J 2023-6-14
p=polyfit(x,y,4);
data_detrend = y-polyval(p,x)

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Alan Stevens
Alan Stevens 2023-6-13
编辑：Alan Stevens 2023-6-13
polyfit just returns the coefficients of the polynomial. You need to use them in polyval to calculate data values.
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Fabian
Fabian 2023-6-13
I tried polyval but the same issue comes up regarding the arrays not having compatible sizes

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