Error using Contour: input arguments must be numeric or objects which can be converted to a double
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Sergio Manzetti
il 22 Giu 2021
Risposto: Sergio Manzetti
il 24 Giu 2021
Hi, I have the given code where I try to plot levels curves of the givenfunction
syms r x y k z
[ph,r] = meshgrid((0:5:360)*pi/180,0:.5:10);
[X,Y] = pol2cart(ph,r);
Z = X+i*Y;
J = besselj(k,l.*r);
J2 = besselj(k,m.*r);
Y = bessely(k,l.*r);
Y2 = bessely(k,m.*r);
H = besselh(k,r);
F1 = symsum((J).*exp(1i*k*ph),k,-5,5);
F2 = symsum((J2+Y2).*exp(1i.*k.*ph),k,-5,5);
F3 = symsum(H.*exp(1i.*k.*ph),k,-5,5);
pwu = nan(size(F1), 'like', F1);
mask = 0 <= r & r < 0.5;
pwu(mask) = F1(mask);
mask = 0.5 <= r & r < 1;
pwu(mask) = F2(mask);
mask = r >= 1;
pwu(mask) = F3(mask);
U = subs(pwu, {l, m}, {1.5, 3});hold on
contour(X,Y,imag(double(U)),30)
axis equal
xlabel('r','FontSize',14);
ylabel('phi','FontSize',14);
But I get an error for the 4th last line. How can this be made in a way it is converted to a double?
Thanks!
1 Commento
Asvin Kumar
il 24 Giu 2021
I'm not able to run this script because the variables l, m, n, etc are not defined. Could you update the attached code so that your error can be reproduced?
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