• MATLAB how to make loop that user keeps pressing a negative number

    ShikhaTan Member September 12, 2015 at 11:03 am

    How do I keep looping so that if the user keeps pressing a negative number it keeps displaying the message “error”? 

    g=9.81
V0=input ('Enter initial velocity of projectile (m/s):')
if V0<0
disp ('Error. Velocty must be greater than 0');
V0=input ('Enter initial velocity of projectile (m/s):')
else
x=input ('Enter target location in X direction (>0m):')
theta=(asin(x*g/V0^2))/2
end
    #7719
  • Adan Member September 12, 2015 at 11:03 am

    you have to do is to give an initial value to V0 for instance: V0=-1
    and then run the loop(put the whole code inside this loop)

    #7720
  • Abhey Member September 12, 2015 at 11:04 am

    If i keep inputting a negative answer it keeps repeating which i want
    but if i run the program from the beginning and input a vale >0 for V0 it jsut falls through and gives an answer for theta without asking for the x value

    g=9.81
V0=0

V0=input ('Enter initial velocity of projectile (m/s):')
while (V0<0)
disp ('Error. Velocty must be greater than 0');

V0=input ('Enter initial velocity of projectile (m/s):')
if (V0>0)
x=input ('Enter target location in X direction (>0m):')
theta=(asin(x*g/V0^2))/2;
end
end
 theta
    #7721
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