Plotting over a Range of Values

I'm trying to plot orbital speed and period over a range of altitudes, but I keep getting the following error:

Error using  / 
Matrix dimensions must agree.

Error in aeroq25 (line 6)
orbital_speed = sqrt(mu_earth*((2/altitude)-(1/altitude))); %km/s

Does anyone have any tips? Here is my code for reference:

altitude = 150:1:1000;
mu_earth = 3.986*10^5; %km3/s2
orbital_speed = sqrt(mu_earth*((2/altitude)-(1/altitude))); %km/s
period = 2*pi*sqrt((altitude^3)/mu_earth); %second
plot(altitude, orbital_speed);

Answer 1

[Chunru]

Use the array operator .* ./ .^2 for arrays.

altitude = 150:1:1000;
mu_earth = 3.986*10^5; %km3/s2
orbital_speed = sqrt(mu_earth*((2./altitude)-(1./altitude))); %km/s
period = 2*pi*sqrt((altitude.^3)/mu_earth); %second
plot(altitude, orbital_speed);

[Ryan McPherson]

Awesome, thanks so much.