polar plot being reflected

I have been trying to plot a polar plot. However, MATLAB reflects the smaller loop. That loop is supposed to be on the left side of 0. Please help!

My code:

function micplothyp
theta=0:0.1:((2*pi)+1);
R= 0.25 + (0.75 * cos(theta));;
polarplot(theta,R,'r');

ax=gca;
ax.ThetaColor= 'k';
ax.ThetaAxis.Color='k';
ax.RTick= [0 0.2 0.4 0.6 0.8 1];
ax.RAxisLocation=30;
ax.Box='on';
ax.GridLineStyle='-.';

title('Response of a hyper-cardioid microphone');
end

Answer 1

[Star Strider]

Plot the absolute value of ‘R’:

polarplot(theta,abs(R),'r');

That should produce the plot you want.

[SARVESH AGRAWAL]

Thank you sir!

[Star Strider]

As always, my pleasure!

Answer 2

[Abida Parveen]

most microphones designed for use on a stage are directional microphones, which are specifically built to enhance the signals recived from the singer in the front of the microphone while suppressing the audience noise from behind the microphones.

the gain of such a microphone varies as a function of angle according to the eqution.

gain=2g(1+cosθ)

where g is a constant associated with a particular microphone, and θ is the angle from the axis of the microphone to the sound source. assume that g is 0.5 for a particular microphone, and make a polar plot the gain of the microphone as a function of the direction of the sound source.

[Steven Lord]

This sounds like a homework assignment. If it is, please post this as a separate question. When you post that separate question, show us the code you've written to try to solve the problem and ask a specific question about where you're having difficulty and we may be able to provide some guidance.

If you aren't sure where to start because you're not familiar with how to write MATLAB code, I suggest you start with the MATLAB Onramp tutorial (https://www.mathworks.com/support/learn-with-matlab-tutorials.html) to quickly learn the essentials of MATLAB.

If you aren't sure where to start because you're not familiar with the mathematics you'll need to solve the problem, I recommend asking your professor and/or teaching assistant for help.

[Abida Parveen]

yes Sir ,

it's my assingnment question. i didn't understad.

Thank you Sir for your suggestion.

this is my code

x=linspace(0,90,180);

g=0.5;

y=2*g(1+cos(x));

plot(x,y,'b-');

title('polar plot')

xlabel('x');

ylabel('y');

grid on

i am new user of MATLAB.