MATLAB: Weighted fit

curve fitting

Hello,
I want to fit some data with a weightfactor, which i have already made. So I have a matrix of 30 by 53 with data, and a matrix with a weightfactor for each datapoint. I want to fit it for each line seperately. I have been looking in the MATLAb help, bet I can't figure out how to do this myself
Does anyone know how to do this?
Thanks! Ellen

Best Answer

Look at example code:
% generate data
x = 0:.1:10;
y = x.*x + randn(size(x));
w = linspace(.5, .7,length(x));
x = x(:);
y = y(:);
w = w(:);
%plot data
plot(x,y,'.');
%fit
ft = fittype('poly2');
cf = fit(x,y,ft,'Weight',w);
% Plot fit
hold on
plot(cf,'fit',0.95);
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