Question

6) Plot a star that prompts the user to enter how many points the star has. Only worry about odd numbered points. Indicate to the user only odd numbers can be entered. Change the star line color to red.

Answer 1

Code:

n=input('Enter the number of points.Only odd numbers are allowed');

Rotangle= 0;% Angle of rotation to rotate the star at requirement.
centx = 3;%Position of center of the star with respect to x-axis.
%You can change at your requirement

centy= 7;%Position of center of the star with respect to y-axis

theta = Rotangle + (0 : (n-1)/n*pi : (n-1)*pi);
% angles that the arm tips are located at
amplitude = 3;%distance from the center of star to the arm tip.

%x and y coordinates of the arm tips.
x = amplitude .* cos(theta) + centx;
y = amplitude .* sin(theta) + centy;

plot(x, y, 'r', 'LineWidth', 2);grid on; axis square;

code snippet:

• 
  = 1 n=input('Enter the number of points. Only odd numbers are allowed'); 2 3 Rotangle= 0;% Angle of rotation to rotate the star at requirement. 4 centx 3;%Position of center of the star with respect to x-axis. 5 %You can change at your requirement 6 7 centy= 7;%Position of center of the star with respect to y-axis 8 9 theta = Rotangle + (0 : (n-1)/n*pi : (n-1)*pi); 10 % angles that the arm tips are located at 11 amplitude = 3;%distance from the center of star to the arm tip. 12 13 %x and y coordinates of the arm tips. 14 x = amplitude .* cos(theta) + centx; 15 y = amplitude * sin(theta) + centy; 16 17 plot(x, y, 'r', 'LineWidth', 2);grid on; axis square; 1
  

Results:

Enter the number of points.Only odd numbers are allowed 7 10 8 6 >> gam Enter the number of points. Only odd numbers are allowed 9 10 0 2 >> gam Enter the number of points. Only odd numbers are allowed 5 10 O 24 6

10 9 8 7 6 5 4 0 1 3 4 5 6

10 9 8 7 A 6 5 4 0 2 3 4 5 6