How to get the regression from 2 vectors

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Shani
Shani 2013-11-22
编辑： Image Analyst 2013-11-23
Hi, I have 2 vectors and I would like to know the R^2 ie the regression of the line. I would like a line of best fit to show on the plot and the two vectors one on y and one on x axis thanks
  1 个评论
Image Analyst
Image Analyst 2013-11-23
编辑：Image Analyst 2013-11-23
Here is what Shani asked, so that it will still be here when she deletes this question:
subject line: How to get the regression from 2 vectors
Hi, I have 2 vectors and I would like to know the R^2 ie the regression of the line. I would like a line of best fit to show on the plot and the two vectors one on y and one on x axis thanks

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回答（1 个）

Image Analyst
Image Analyst 2013-11-22
Try this demo:
% Create sample data and plot it.
x = 1:10;
y = 3*x - 20 + 4*rand(1, length(x)); % Some equation
plot(x, y, 'r*', 'MarkerSize', 15);
grid on;
% Get the fit
coeffs = polyfit(x, y, 1);
% Get the x values for the fit at higher resolution.
xFit = linspace(x(1), x(end), 300);
% Get the estimated y values
yFit = polyval(coeffs, xFit);
% Plot them as a line.
hold on;
plot(xFit, yFit, 'b-', 'LineWidth', 3);
  1 个评论
Image Analyst
Image Analyst 2013-11-22
编辑：Image Analyst 2013-11-22
My x and y are vectors. What do you have? Give code to generate the kind of data you have.

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