why do I get the error "Error using atan2 Inputs must be real"
34 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
c = 1;
tau = 0.12;
Npanel = 200;
for i = 1:Npanel/2+1
eta(i) = pi*(i-1)/(Npanel/2) ;
x(i) = c*(cos(eta(i)+1)/2);
end
x = sort(x) ;
T = 10*tau*c*(0.2969*sqrt(x/c)-0.126*(x/c)-0.3537.*(x/c).^2+0.2843*(x/c).^3-0.1015*(x/c).^4);
X_u = x - T/2.*sin(atan(0)) ;
X_l = x + T/2.*sin(atan(0)) ;
Y_u = Y_bar + T/2.*cos(atan(0));
Y_l = Y_bar -T/2.*cos(atan(0));
X_u(1) = [] ;
Y_u(1) = [] ;
X = [fliplr(X_l) X_u];
Y = [fliplr(Y_l) Y_u];
for i=1:Npanel
X_bar(i) = (X(i+1)+X(i))/2;
Y_bar(i) = (Y(i+1)+Y(i))/2;
theta(i) = atan2((Y(i+1)-Y(i)),(X(i+1)-X(i)));
l(i,1) = sqrt((X(i+1)-X(i)).^2 + (Y(i+1)-Y(i)).^2);
end
0 Kommentare
Antworten (1)
Cris LaPierre
am 1 Nov. 2021
As the error states, you are trying to use atan2 on complex data, which is not allowed.
The issue starts with how x is calculated. I had to make up a value for Y_bar, but the resulting values were all negative. Then, in your calculating T, you take the sqrt of x. The sqrt of a negative number results in a complex number.
I'm not sure what you want, but function like abs, real, and imag may help you out.
0 Kommentare
Siehe auch
Kategorien
Mehr zu File Operations finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!