is this code of plotting correct?

I wanted to create a code that load data and use it to create scatter plot,Perform a least-squares

fit of loaded data to a straight line,and also Perform a least-squares fit of this

data to a parabola. I also want to plot it on the same plot for comparasion. can you tell me if this is correct.

THIS IS THE CODE I WROTE

load samples
%create a scatter plot
scatter(t,y)
title('Scatter data plot')
xlabel('T')
ylabel('Y')%create a least-square fit of date to a straight line
hold on 
plot(polyfit(t,y,1));
hold on
plot(polyfit(t,y,2));
hold off
%the fit is better with the parabola than it is with the line

Answer 1

[KSSV]

load samples
% Fit a line to data 
p1 = polyfit(t,y,1) ; 
y1 = polyval(p1,t) ; 
% Fit second degree polynomial to data
p2 = polyfit(t,y,2) ; 
y2 = polyval(p2,t) ; 
%  plot
plot(t,y,'.r')
title('Scatter data plot')
xlabel('T')
ylabel('Y')
hold on 
plot(t,y1);
plot(t,y2)

[Aminata camara]

Thank you so much for your help

[KSSV]

Thanks is accepting the answer :)