# error using plot vectors must be the same length

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Heya :) on 1 Oct 2020
Why i am getting this error in plot (Data, hx,) and how to fix it?
This is my code
for i=2:test_points
x_rec(i)=c1+c2*x_rec(i-1)+c3*hx(i-1)+c4*x_rec(i-1)*hx(i-1)+c5*x_rec(i-1)^2+c6*hx(i-1)^2+c7*x_rec(i-1)^2*hx(i-1)^2;
hx(i)=d1+d2*x_rec(i-1)+d3*hx(i-1)+d4*x_rec(i-1)*hx(i-1)+d5*x_rec(i-1)^2+d6*hx(i-1)^2+d7*x_rec(i-1)^2*hx(i-1)^2;
x_real(i)=x(start_point+i-1);
error=error+(x_rec(i)-x_real(i))^2;
DN=DN+x_real(i)^2;
end
Error_x(count)=sqrt(error)/sqrt(DN);
end
figure
hold on
plot (Data,Error_x,'s-r')
plot (Data,hx,'s-b')
This is the error
Vectors must be the same length.
Error in PE_HT (line 136)
plot (Data,hx,'s-b')
dpb on 1 Oct 2020
Too much undefined in the code snippet for us to tell...
KSSV on 1 Oct 2020
The error is clear....diemnsions of Data and hx are not same. Check their sizes.

try to use this line of code inside the loop. For now, the code returns a single point for error;
for i=2:test_points
x_rec(i)=c1+c2*x_rec(i-1)+c3*hx(i-1)+c4*x_rec(i-1)*hx(i-1)+c5*x_rec(i-1)^2+c6*hx(i-1)^2+c7*x_rec(i-1)^2*hx(i-1)^2;
hx(i)=d1+d2*x_rec(i-1)+d3*hx(i-1)+d4*x_rec(i-1)*hx(i-1)+d5*x_rec(i-1)^2+d6*hx(i-1)^2+d7*x_rec(i-1)^2*hx(i-1)^2;
x_real(i)=x(start_point+i-1);
error=error+(x_rec(i)-x_real(i))^2;
DN=DN+x_real(i)^2;
Error_x(i)=sqrt(error)/sqrt(DN);
end
end