Plotting Issue for a quartic equation

Hi

I just got an issue for plotting a quartic equation like y = (x.^2+1).^2/x.^2 which always give me back a linear spot-points figure. However, I tried to use MuPAD to plot this function which returned the result is what I expected. So, I am thinking it might be the expression format which was defined differently in MATLAB.

Could someone point out the issue?

Thanks Yu

Code in MATLAB (Actually, it will be four functions in total)

y = (x.^2+1).^2/x.^2;

figure
plot(x,y)

Code in MuPAD

 plot(y=(R^2 + 1)^2/R^2, y=(R^2 + 4)^2/(4*R^2), y=(R^2 + 9)^2/(9*R^2), y=(R^2 + 16)^2/(16*R^2), R=0..5,     y=0..10)

Answer 1

[John D'Errico]

You seem to understand about the use of and need for the dot operators, such as .^, so why do you not use ./ for division? That little . before the / is important. Use it.