You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: sinefit_documentation.m
    path of file: ./repos/CDT/cdt/doc
    
    the code of the file until where you have to start completion: %% |sinefit| documentation
% |sinefit| fits a least-squares estimate of a sinusoid to time series data
% that have a periodicity of 1 year. 
% 
% For related functions, see <sineval_documentation.html |sineval|> and 
% <sinefit_bootstrap_documentation.html |sine
    
function 
% of day of year: 

figure(2)
plot(doy(t),y,'o') 

axis tight
box off
xlabel 'day of year'

%% 
% In this toy dataset, we know we should have a sinusoid with an amplitude of 
% 75 units, a maximum value on day 123, and a long term trend of -2.2 units 
% per year. And since we intentionally added 36 units of gaussian noise, we know
% the sinusoid should match the "measurements" to about an rms error of 36 units. 

[ft,ft_error] = sinefit(t,y,'terms',4)

%% 
% The numbers above tell us that |sinefit| has determined our 100 noisy 
% datapoints are characterized by a sinusoid with an amplitude of |ft(1)| 
% units, which we see is close to the prescribed value of 75, a maximum value
% near the 123rd day of the year, and a linear trend