Help plotting a curve according to specific conditions of a variable

I want my plot to display theta1's value as theta for all values of theta that range from 0 to pi and it should display theta1's value as (-theta) for all values of theta that range from pi to 2pi. This is my code so far. At this point, it's only plotting the value of theta1 from pi to 2pi as (-theta).

theta = linspace(0, 2*pi, 360);

theta1=[];

theta2= pi;

if (0<=theta)&(theta<=pi)

theta1=theta;

figure(1);

plot(rad2deg(theta), rad2deg(theta1));

hold on

elseif (pi<theta)&(theta<=2*pi)

theta1=-theta;

end

hold off

grid;

Answer 1

[Alan Stevens]

You mean like this?

theta = linspace(0, 2*pi, 360);
theta1=theta;
theta1(180:end) = -theta(180:end);
plot(rad2deg(theta), rad2deg(theta1)),grid

[Alan Stevens]

Alternatively, if you don't want the vertical line:

theta = [0 180 NaN 180 360];
theta1 = [0 180 NaN -180 -360];
plot(theta,theta1), grid

is possible.