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

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isamh am 19 Feb. 2020
Kommentiert: darova am 24 Feb. 2020
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 am 24 Feb. 2020
• I added the: save('answers.mat', 'X', 'Y'); to both codes and still didnt the regression line.
Image Analyst can you cooperate?
isamh am 24 Feb. 2020
Bearbeitet: isamh am 24 Feb. 2020
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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### Akzeptierte Antwort

darova am 24 Feb. 2020
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 am 24 Feb. 2020
Trued that but I believe the columns are now unequal lengths. I get this error message: error with p1=polyfit(X1,Y1,1);
darova am 24 Feb. 2020
Please post the entire error and code you used

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