n=10;
x=1:n;
y=rand(1,n);		% Original vector (­ì©l¦V¶q)
ratio=1.75;		% The vector interpolation should have a length equal to 1.8 times the original vector
m=round(n*ratio);	% Length of the scaled vector
x2=linspace(1, n, m);
y2=interp1(x, y, x2);	% Vector after interpolation
subplot(2,1,1), plot(x, y, 'o-', x2, y2, 'o:');
legend('Original vector', 'Interpolated vector', 'location', 'northOutside', 'orientation', 'horizontal');
subplot(2,1,2), plot(1:length(y), y, 'o-', 1:length(y2), y2, 'o:');
legend('Original vector', 'Scaled vector', 'location', 'northOutside', 'orientation', 'horizontal');
fprintf('Desired length ratio = %f\n', ratio);
fprintf('Actual length ratio = %f\n', length(y2)/length(y));