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

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Aarach Sap
Aarach Sap 2021-10-27
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');

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回答（1 个）

KSSV
KSSV 2021-10-27
%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)
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Aarach Sap
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

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