How can draw a linear regression though a plot?

Question

Joseph 2018-3-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/391088-how-can-draw-a-linear-regression-though-a-plot

评论： Joseph 2018-3-28

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

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2018-3-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/391088-how-can-draw-a-linear-regression-though-a-plot#answer_312280

https://www.mathworks.com/help/stats/regress.html

"regress treats NaN values in X or y as missing values. regress omits observations with missing values from the regression fit."

2 个评论
显示无隐藏无

Joseph 2018-3-27

编辑：Joseph 2018-3-27

f.mat
C.mat

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 2018-3-28

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.

请先登录，再进行评论。