Covariance & Correlation Coefficient calculation in MATLAB without using built in functions

Prerequisite:
Standard Deviation in MATLAB Standard Deviation in MATLAB without using std

%Code:

clc

clear all

close all

x=input('Enter the data points:');

a1=mean(x);

z=[];

for i=1:length(x)

    z=[z (x(i)-a1)^2];

end

s1=sum(z);

s1=s1/(length(x)-1);

s1=sqrt(s1);

y=input('Enter the data points:');

a2=mean(y);

z=[];

for i=1:length(y)

    z=[z (y(i)-a2)^2];

end

s2=sum(z);

s2=s2/(length(x)-1);

s2=sqrt(s2);

x=x-a1;

y=y-a2;

ak=x*y';

cova=ak/(length(x)-1);

corr=cova/(s1*s2);

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