how to tabulate complex numbers using fprintf?

Hi All,

I have some results in complex form. I want to tabulate these results by using fprintf but I just get the real parts of numbers on my command window. Here is my code:

g=@(x)x^4-(0.4982*x^3)+(2.7464*x^2)-(1.1146*x)+(2.6699)
dgdx=@(x)(4*x^3)+(1.4946*x^2)+(5.4928*x)+(1.1146)
x0=1+i
x=x0
it_no=0
fprintf('\n\n%18s%18s%18s\n','it_no','x','g(x)');
while 1
    it_no=it_no+1;
    xprev=x;
    x=xprev-(g(x)./dgdx(x));
    if abs(g(x))<10^-4;
        break
    end  
    fprintf(' %17.0f\t %17.7f\t %17.7f\t\n',[it_no,x,g(x)]);
end
fprintf(' %17.0f\t %17.7f\t %17.7f\t\n',[it_no,x,g(x)])

How can I tabulate both real and imaginary parts of complex numbers using fprintf? Anyone to help me for this problem?

I'll appreciate for any help.

Thanks Already!

Answer 1

[Star Strider]

You have to separate the real and imaginary parts and print them individually. See if replacing your fprintf statements with this one produces the results you want:

fprintf(' %17.0f\t %17.7f %11.7f*i\t %17.7f %11.7f*i\t\n',[it_no,real(x),imag(x),real(g(x)),imag(g(x))])

[Otto]

Thank you very much for your interest. I have a last question: Is it possible to use "+" sign between real and imaginary parts or do i have to display results in the format that you suggested?

[Star Strider]

My pleasure!

To get a ‘+’ sign, insert a ‘+’ right after the ‘%’ in the numeric format specifiers. This forces fprintf (and all other functions that use this sort of format) to print the sign. Use this for your fprintf statements to do that:

fprintf(' %17.0f\t %17.7f %+11.7f*i\t %17.7f %+11.7f*i\t\n',[it_no,real(x),imag(x),real(g(x)),imag(g(x))])