multiple number of inputs, two variables, linear regression

so, i need to insert two variables (14 times each) and find the linear regression of those values

i wrote this code :

clear all
clc
n=input('give n:'); %, 's');
x=zeros(n,1); % pinakas nx1
y=zeros(n,1); % pinakas nx1
    for i=1:n
x(i)=input(['give x:' num2str(i,3)], 's');
y(i)=input(['give y:' num2str(i,3)], 's');
    end
X=mean(x);
Y=mean(y);
b=sum((x-X).*(y-Y))/sum((x-X).*(x-X))
a=Y-b*X

but each time i input two digit number i get this message: "Unable to perform assignment because the left and right sides have a different number of elements."

what am i doing wrong?

thank you

Answer 1

[Walter Roberson]

x(i)=input(['give x:' num2str(i,3)], 's');

When you use 's' for input() then it requests a character vector of output. Unless the user happens to enter exactly one character, the result is not going to fit inside x(i) . Furthermore, you later use the x values as numeric, so it seems unlikely that you want to record the characters. I suggest removing the 's' option of input()

Answer 2

[Yiannis Kotrotsos]

thank you, i removed num2str(i,30], 's'); as below and i got my result (i think!)

thanks again for answering on such short notice!

n=input('give n ');

x=zeros(n,1);

y=zeros(n,1);

for i=1:n

x(i)=input(['give x']); % num2str(i,3)], 's');

y(i)=input(['give y']); num2str(i,3)], 's');

end

X=mean(x);

Y=mean(y);

b=sum((x-X).*(y-Y))/sum((x-X).*(x-X))

a=Y-b*X