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How can draw a linear regression though a plot?

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Joseph
Joseph 27 Mar 2018
Commented: Joseph 28 Mar 2018
Hi everyone I have to arrays f(32,302) and C(32,302) in which some of the elements of f and C are nan. i want to plot (plot(f,C)) and include linear regression (i tried polyfit(x,y,1)) but the problem is that because of nan values it returns y=nanX+nan. does anyone know how can I solve this problem?
thankyou
thank you

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채택된 답변

Walter Roberson
Walter Roberson 27 Mar 2018
"regress treats NaN values in X or y as missing values. regress omits observations with missing values from the regression fit."

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Joseph
Joseph 27 Mar 2018
i tried b=regress(C,f), but it returns below error: Error using regress (line 62) Y must be a vector and must have the same number of rows as X. even though f and C arrays are the same size. i attached my f and C arrays. please take a look.
thank you
Joseph
Joseph 28 Mar 2018
I think i figured it out, I have to convert f and C matrices to vectors and remove nan values and then I can use regress(c,f) or polyfit(f,C,1) to find the linear regression of the plot.
thanks walter for your help.

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