Invalid use of operator in for loop

Why am i getting an error message for this?

(am i also correct in using the '||' to mean 'or'?)

  theta0 = tand(v0y/v0x)
    for  theta0 > 90  || theta0 < 0 
        % where the '>' gives an error message
    end

if i switch the positions of the 'theta0 <0' and 'theta0 > 90' then i will get an error for the '<'

(whichever comes first has the error message)

Answer 1

[Joseph Wilson]

theta0 = tand(v0y/v0x)

while theta0 > 90 || theta0 < 0

% where the '>' gives an error message

end

Changing this to a while loop should fix your issue. A for loop counts for a specified number of iterations, the while loop iterates while some condition is met. So for your case you want this loop to run while theta0 is greater than 90 or less than 0. when that condition is no longer true, then the loop ends. Need to make sure that the code inside the loop changes theta0 or it will loop forever. If your do not plan on changing theta0 inside the loop, then Paul is correct above with using an if statement.

[Anon]

thank you very much!

Answer 2

[Paul]

You're geting the error because that's the wrong syntax for a for loop:

doc for

Having said that, it kind of looks like you really want an if statement:

doc if

[Anon]

thank you paul! :3