How to plot smooth curve in matlab

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]

[KSSV]

What you want to do with it?

[Awat]

I plot the data but this graph not smooth curve. I want to the smooth curve using Matlab.

Answer 1

[KSSV]

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') ;

[Awat]

Thank you very much.

[Arika Amasarao]

Excellent Sir

[Shaleena Manafudeen]

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]

@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.

Answer 2

[Nandana Rajeev]

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