how i can smooth my data ?

i want to make smoothing to my data that i plot here ?

ANSWER

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One way to do it is to use a Savitzky-Golay filter, basically a moving/sliding polynomial fit. See the attached code, below the screenshot, for a demo.

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 25;
% Make a noisy sine wave signal
x = 1 : 300;
period = 50
y = sin(2*pi*x/period);
noiseAmplitude = 0.8;
y = y + noiseAmplitude * rand(size(y))

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how i can smooth my data ?

how i can smooth my data ?