# Need Help TroubleShooting If/Else Statement

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Jon Stapchuck on 11 Mar 2021
Commented: Jon Stapchuck on 11 Mar 2021
Helo,
Basically I have an if/else statement to ensure a given value obtain from cosine and sine is between -180 and +180.
In other words, if the value ends up being 270-deg, I want it to be -90-deg instead.
I set up an if/else statement as follows, where phi2a comes from a value from a function.
phi2b = 180-phi2a;
if phi2b > 180
phi2b = phi2b-360;
else
phi2b;
end
When I do this, however, whenever phi2b is greater than 180, it still produces a value greater than 180.
I tried to do a sample code (below) to see if the syntax is correct, but this one ended up working when I change the value of A:
A = 1;
if A > 10
A = A+5;
else
A;
end
So if A=1, then it outputs 1. If A = 20, it outputs 25. This is how I want the other if/else to function.
Basically the phi2a is a vector running from 1 to N, where N is 4393. I then plot either phi1a, phi1b, phi2a, or phi2b (Not all of which is shown here), based on another if/else statement. I can show this code as well if it'll help.
Any help is appreciated. Thanks.
Edit: I've added a snippet of my whole code in case that helps.

the cyclist on 11 Mar 2021
Is it possible that your input value was greater than 540? Because if it was then it will still be greater than 180 after your if statement:
phi2b = 550;
if phi2b > 180
phi2b = phi2b-360
end
phi2b = 190
You could take care of this case by using a while loop instead:
phi2b = 550;
while phi2b > 180
phi2b = phi2b-360;
end
disp(phi2b)
-170
Jon Stapchuck on 11 Mar 2021
Okay thank you for your help. That makes sense why my original method didn't work

R2017a

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