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

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isamh 2020년 2월 19일
댓글: darova 2020년 2월 24일
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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isamh 2020년 2월 24일
편집: isamh 2020년 2월 24일
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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### 채택된 답변

darova 2020년 2월 24일
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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darova 2020년 2월 24일
Please post the entire error and code you used

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