So I was given a set of x and y coordinates. We were asked to plot the set with a non-connecting points. Then to create a function that generates the best fit line for the list and plot it on the same chart which I did. But it ended up with a bunch of vertical lines connecting the data points and the best fit line together...(
(I've attached a picture)). How do I remove this? Here is my code if you need it for reference:
function cubicfit(x,y)
xp=x;
yp=y;
plot(xp,yp,'.')
xlabel('X data')
ylabel('Y data')
hold on
A=zeros(41,4);
for i=1:length(x)
A(i,1)=[((x(i))^3)];
end
for i=1:length(x)
A(i,2)=[((x(i))^2)];
end
for i=1:length(x)
A(i,3)=[((x(i))^1)];
end
for i=1:length(x)
A(i,4)=[((x(i))^0)];
end
c=(((A')*A)^-1)*((A')*y)
for i=1:length(x)
y(i)=((c(1)*(x(i)))^3)+((c(2)*(x(i)))^2)+((c(3)*(x(i))))+(c(4));
plot(x,y,'-')
end
