How to spline 163 data points into 100 data points?
3 views (last 30 days)
Show older comments
I have a data set that is a "double" class 163x1 in a numeric matrix, I would like to spline this data into 100 points instead of 163 data points.
Although I have researched and checked on the 'Help' section of spline, I have followed it to the best of my abilities and I have searched here for answers, unfortunately I have not found my answer.
Furthermore, when I run through this code that I have created it says that "Index in position 2 is larger than array. This should be less than 1".
z = [lCOMz_FS1_1]';
x1 = 0:1:99;
y1 = linspace(z(1,1), z(1,163), 100);
COMz = spline(x1,y1);
plot(x1,y1,COMz)
I'd like to thank anyone in advance for such helping me on such a simple code.
4 Comments
Torsten
on 1 May 2024
Edited: Torsten
on 1 May 2024
You want to interpolate - thus you have to make your z-data a function of 163 x-values. And in order to interpolate your data in 100 points, you have to specify 100 points somewhere in between these 163 x-values in which you want to do this.
Example:
x = linspace(0,1,163);
f = x.^2;
xinter = linspace(0,1,100);
finter = interp1(x,f,xinter,'spline');
hold on
plot(x,f)
plot(xinter,finter)
hold off
grid on
Answers (2)
the cyclist
on 30 Apr 2024
I expect you want to use the spline method in the interp1 function. It may be possible to give more specific help if you upload the data. (You can attach a MAT file using the paperclip icon from the INSERT section of the toolbar.)
4 Comments
the cyclist
on 1 May 2024
I didn't see this comment until after Torsten seems to have solved your problem (using interp1!), so I guess you are all set.
Image Analyst
on 1 May 2024
See attached demo. You can easily use new values for the descriptively-named variables in the demo to do what you want.
0 Comments
See Also
Categories
Find more on Splines in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!