How to get the x, y data after using smoothing spline in Matlab?

Question

Aarach Sap 2021-10-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1572573-how-to-get-the-x-y-data-after-using-smoothing-spline-in-matlab

评论： Aarach Sap 2021-10-28

I have tried the below code to get the x,y data after using smoothing spline. I am still confused with

h = findobj(gca,'Type','line');
x=get(h,'Xdata');
y=get(h,'Ydata');

Is it all the x y data obtained after smoothing ? I feel very less data is showing in x, y.Please let me know where I am going wrong? Here is my code..

%Load the x-axis data
filename1 = 'Time.xlsx';
Time = xlsread(filename1);
%Load the y-axis data
filename2 = 'X.xlsx';
X= xlsread(filename2);
%Performing smoothing spline
% Time and X are input data
[f,gof,out] = fit( Time, X, 'smoothingspline');
% Plot fit with data.
figure( 'Name', 'TimeVsX' );
h=plot(f,'fit');
legend(h,'After Smoothing', 'Location', 'NorthEast', 'Interpreter', 'none' );
% Label the axes
xlabel( 'Time', 'Interpreter', 'none' );
ylabel( 'X', 'Interpreter', 'none' );
grid on
h = findobj(gca,'Type','line');
x=get(h,'Xdata');
y=get(h,'Ydata');

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

KSSV 2021-10-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1572573-how-to-get-the-x-y-data-after-using-smoothing-spline-in-matlab#answer_817413

在 MATLAB Online 中打开

%Load the x-axis data
filename1 = 'Time.xlsx';
Time = xlsread(filename1);
%Load the y-axis data
filename2 = 'X.xlsx';
X= xlsread(filename2);
%Performing smoothing spline
% Time and X are input data
[f,gof,out] = fit( Time, X, 'smoothingspline');
% get smoothed values
X_smooth = f(Time)

5 个评论
显示 3更早的评论隐藏 3更早的评论

KSSV 2021-10-27

在 MATLAB Online 中打开

n = 500 ;
Time_i = linspace(min(Time),max(Time),n);
X_smooth = f(Time_i)

Aarach Sap 2021-10-28

I am still not getting. I just want the points or data after smoothing. I can fix the range from app also but i am not getting the values from apps, only can generate code. According to above my code, the values can be obtained by

X_smooth = f(Time)

Y_smooth = f(X) ???? plz let me know

请先登录，再进行评论。