How to plot smooth curve in matlab
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x=[0 0.025 0.05 0.075 0.1 0.125 0.15 0.175 0.2 0.225 0.25 0.275 0.3 0.325 0.35 0.375 0.4 0.425 0.45 0.475 0.5 0.525 0.55 0.575 0.6 0.625 0.65 0.675 0.7 0.725 0.75 0.775 0.8 0.825 0.85 0.875 0.9 0.925 0.95 0.975 1 ]
y=[1.422 1.427 1.431 1.396 1.396 1.377 1.377 1.358 1.357 1.338 1.338 1.319 1.318 1.301 1.301 1.288 1.287 1.278 1.278 1.274 1.274 1.275 1.276 1.282 1.282 1.294 1.294 1.309 1.310 1.328 1.328 1.348 1.348 1.367 1.367 1.386 1.386 1.413 1.413 1.039 1.025]
Accepted Answer
KSSV
on 24 Oct 2016
Edited: MathWorks Support Team
on 2 Mar 2023
UPDATE:
Starting in R2017a, you can smooth noisy data using built in MATLAB functionality:
- Use function ‘smoothdata’: https://www.mathworks.com/help/matlab/ref/smoothdata.html
- Use the Smooth Data task to interactively smooth noisy data. The task automatically generates MATLAB code for your live script. https://www.mathworks.com/help/matlab/ref/smoothdatatask.html
clc; clear all ;
x=[0 0.025 0.05 0.075 0.1 0.125 0.15 0.175 0.2 0.225 0.25 0.275 0.3 0.325 0.35 0.375 0.4 0.425 0.45 0.475 0.5 0.525 0.55 0.575 0.6 0.625 0.65 0.675 0.7 0.725 0.75 0.775 0.8 0.825 0.85 0.875 0.9 0.925 0.95 0.975 1 ] ;
y=[1.422 1.427 1.431 1.396 1.396 1.377 1.377 1.358 1.357 1.338 1.338 1.319 1.318 1.301 1.301 1.288 1.287 1.278 1.278 1.274 1.274 1.275 1.276 1.282 1.282 1.294 1.294 1.309 1.310 1.328 1.328 1.348 1.348 1.367 1.367 1.386 1.386 1.413 1.413 1.039 1.025] ;
yi = smooth(y) ;
plot(x,y,'r')
hold on
plot(x,yi,'b') ;
4 Comments
Shaleena Manafudeen
on 18 Mar 2021
I tried to execute the same program in Matlab R2019b and obtained error as follows:-
Error in smooth (line 5)
yi = smooth(y) ;
John Nkor
on 23 Apr 2021
@Shaleena Manafudeen The error might suggest that you do not have the "Curve Fitting Toolbox" installed on as an add-ons app. To do this click on the apps tab > get more apps. Once the add-on Explore window opens, search for Curve Fitting Toolbox and install.
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