Using polyfit in two arrays to detrend data.

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)

Answer 1

[Matt J]

p=polyfit(x,y,4);

data_detrend = y-polyval(p,x)

[Fabian]

Thank you so much this worked!

Answer 2

[Alan Stevens]

polyfit just returns the coefficients of the polynomial. You need to use them in polyval to calculate data values.

[Fabian]

I tried polyval but the same issue comes up regarding the arrays not having compatible sizes