How can i fit a linear line to a scatter plot knowing the intercept?

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Joseph
Joseph 2018-7-12
回答： Star Strider 2018-7-12
Hi, I have an array lets say, E(500,2) and I want to fit a line to scatter plot of E (scatter(E(:,1), E(:,2))), but the intercept for this fit is known within the error. if i use polyfit(E(:,1),E(:,2),1), i cannot determine the intercept. is there any way that I can fit a linear line with a fixed intercept?
thanks in advance

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Star Strider
Star Strider 2018-7-12
See if this does what you want:
E = rand(500, 2); % Create Data
x = E(:,1); % Create Data
y = E(:,2); % Create Data
intercept = 0.7; % Create Data
B = x(:) \ (y(:)-intercept); % Estimate Parameters (Linear Model)
yfit = [x(:) ones(size(x(:)))]*[B; intercept]; % Fit Data
figure
plot(x, y, 'pg')
hold on
plot(x, yfit, '-r')
hold off

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