Limit SmoothingSpline plot to smoothdata plot

TB_011

2021 5 14

0 个回答

7 次查看（30 天）

0 个投票

Hello,

i have data, which i plot, then smoothe with dx = smoothdata(x, 'movmedian'). Now I would like to insert a smoothspline with fit into my plot. Unfortunately the smoothingspline does not start where my first data point of my smoothdata is, but earlier. How can I plot a specific section of a smoothingspline. Thanks for the help.

3 个评论
显示 1更早的评论隐藏 1更早的评论

TB_011 2021-5-17

在 MATLAB Online 中打开

ft = fittype('smoothingspline');
opts = fitoptions('Method', 'SmoothingSpline', 'SmoothingParam', 0.04);
plot(t, x_min, 'g')
hold on 
plot(t, x_max, 'g')
sdx_max = smoothdata(x_max, 'movmedian', 25); 
sdx_min = smoothdata(x_min, 'movmedian', 25); 
plot(t, sdx_max, 'c-', 'LineWidth',1.5);
plot(t, sdx_min, 'c-', 'LineWidth',1.5);
f = fit(t', sdx_min, ft, opts);
f_lim = plot(f);
set(f_lim, 'Color', 'r', 'LineWidth', 1);
g = fit(t', sdx_max, ft, opts);
g_lim = plot(g);
set(g_lim, 'Color', 'b', 'LineWidth', 1);
hold off
grid('on')
yticks([-1.5:0.5:2.5])
xticks([-15:5:25])
ylabel('x-distance [m]')
xlabel('time [s]')
xlim([-15 25]);
ylim([-1.5 2.5]);
legend('off')

This is my code.

The green plots are my rawdata, the light blue ones my smoothed plot. The red and blue lines are my fitted plots with the fitoption and type 'smoothingspline'

As you can see, my SmoothingSpline doesn't have the same startingpoint as my smoothed data line. In this case my time t_0 (x axis) is -7.60. I would like to start plotting my smoothing spline from my t_0, but nothing worked.

Thank you for your help