Finding real and imaginary part of an equation
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syms U P
P = sqrt((((20*U^2) -15) + sqrt((400*U^4)+ (1080*U^2) + 25 -600 - 450 - (1125/U^2))) / ((36*U^2) + 30));
p = solve(P);
real_part_U = real(p);
imaginary_part_U = imag(p);
disp(real_part_U);
disp(imaginary_part_U);
plot (p,imaginary_part_U);
I have an equation of p in terms of U for which I need to find real and imaginary part of p in terms of U and plot the imag(p) wrt U. I don't get the correct graph by using above code. What am I doing wrong?
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Réponses (2)
Walter Roberson
le 4 Déc 2023
You extracted the real part into a variable but you plot() the complex variable.
syms U P
P = sqrt((((20*U^2) -15) + sqrt((400*U^4)+ (1080*U^2) + 25 -600 - 450 - (1125/U^2))) / ((36*U^2) + 30));
p = solve(P);
real_part_U = real(p);
imaginary_part_U = imag(p);
disp(real_part_U);
disp(imaginary_part_U);
plot(real_part_U,imaginary_part_U);
2 commentaires
Torsten
le 4 Déc 2023
It's not easy to understand what you want.
You are given P, you solve
P = sqrt((((20*U^2) -15) + sqrt((400*U^4)+ (1080*U^2) + 25 -600 - 450 - (1125/U^2))) / ((36*U^2) + 30));
for U and after this, you want to plot imag(P) vs. U ? What if U is complex ?
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