How to plot a single column of values with a linear regression line through it

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isamh 2020-2-19

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https://ww2.mathworks.cn/matlabcentral/answers/506449-how-to-plot-a-single-column-of-values-with-a-linear-regression-line-through-it

评论： darova 2020-2-24

采纳的回答： darova

I have a column that I wann plot and have a regression line go through it, How would I do that?

my code so far is:

figure(1)

title('Phase1')

plot(FG)

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darova 2020-2-24

I added the: save('answers.mat', 'X', 'Y'); to both codes and still didnt the regression line.

Image Analyst can you cooperate?

isamh 2020-2-24

编辑：isamh 2020-2-24

Lol I just noticed what was wrong with that. Thought he wanted me to do something else, I’m unable to provide the data now and was wondering if we could just use random data. Forgot to mention that i have some NAN rows with both columns, would that effect the results?

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采纳的回答

darova 2020-2-24

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https://ww2.mathworks.cn/matlabcentral/answers/506449-how-to-plot-a-single-column-of-values-with-a-linear-regression-line-through-it#answer_417101

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Here is a simple example (i made it special for you)

N = 20;
x = linspace(0,3,N);
y = 2*x + rand(1,N);
p = polyfit(x,y,1);
y1 = polyval(p,x);
plot(x,y,'.r')
hold on
plot(x,y1,'b')
hold off

Forgot to mention that i have some NAN rows with both columns, would that effect the results?

Then you should do interpolation without NaN

ix = ~isnan(y);             % choose indices that are not NaN
x1 = x(ix);
y1 = y(ix);
p = polyfit(x1,y1,1);
y2 = polyval(p,x1);

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isamh 2020-2-24

Trued that but I believe the columns are now unequal lengths. I get this error message: error with p1=polyfit(X1,Y1,1);

darova 2020-2-24

Please post the entire error and code you used

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