%There is plotting code at the end of the file, which you shoud
%use to present your solution.

n = 400; %number of data points
N = 20; %data comes from an NxN grid
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];

%plot the the true data, y_true, and the noisy
%data, y, in two different ways. the top plots
%have black lines which mark that two cells do
%not have an edge linking them in the graph.
%all other cells are connected to their
%up, down, left, and right neighbors.

laplacian_smoothing_plot(y_true,'True data, y_{true}',y,'Noisy data, y',0,'')

%Please use the same function to plot your solution for three different
%lambda values, with a command like
%laplacian_smoothing_plot(y1,'y_{hat}, lambda = 0.2',y2,'y_{hat}, lambda = 2',y3,'y_{hat}, lambda = 20')