How to keep my complex root answers un-simplified?

4 views (last 30 days)
Aaron
Aaron on 28 Jun 2012
I've created a formula to calculate complex roots in editor and have the following:
a=input('Enter the value for a: ');
b=input('Enter the value for b: ');
c=input('Enter the value for c: ');
if b^2 > 4*a*c
root_1=(-b+sqrt(b^2-4*a*c))/2*a;
root_2=(-b-sqrt(b^2-4*a*c))/2*a;
fprintf('\n')
disp('Roots are real and distinct:')
fprintf(1,'Root1= %0.0f \n',root_1);
fprintf(1,'Root2= %0.0f \n',root_2);
elseif b^2 == 4*a*c
root_1=-b/(2*a);
root_2=-b/(2*a);
fprintf('\n')
disp('Roots are repeated:')
fprintf(1,'Root1=Root2= %0.0f \n',root_1);
elseif b^2 < 4*a*c
root_1=(-b/2*a)+(sqrt(4*a*c-b^2)/2*a);
root_2=(-b/2*a)-(sqrt(4*a*c-b^2)/2*a);
fprintf('\n')
disp('Roots are complex:')
fprintf(1,'Root1= %0.0f \n',root_1);
fprintf(1,'Root2= %0.0f \n',root_2);
end
So far everything works fine but I don't want the last "elseif" command to simplify the imaginary equation.
For instance if my (a,b,c) are (1,8,25), respectfully, the answer that I would like to have is:
Root1= -4+3i
Root2= -4-3i
How do I keep it this way or at least have the "i"?

Accepted Answer

Walter Roberson
Walter Roberson on 28 Jun 2012
fprintf(1,'Root1= %0.0f%+0.0fi\n', real(root_1), imag(root_1));
  9 Comments
Aaron
Aaron on 28 Jun 2012
Sonovagun!! I should have caught that. Thank you.

Sign in to comment.

More Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!