Hello, I get an error when trying to make a 3d plot using the mesh and meshgrid functions. I don't understand the Property Value Pairs Expected' error that I get.

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Craig Egan Allistair Tan
评论： KSSV 2022-1-28
m = 9.10938188e-31; % Mass of an electron in kg
L = 9; % Well width in nm
[x,y] = meshgrid([0:0.1:9],[0:0.1:9]);
psi_11 = @(x,y) (2/L).*sin((1*pi.*x)/L).*sin((1*pi.*y)/L); % Wave function of the electron in the box
psi_12 = @(x,y) (2/L).*sin((1*pi.*x)/L).*sin((2*pi.*y)/L);
psi_21 = @(x,y) (2/L).*sin((2*pi.*x)/L).*sin((1*pi.*y)/L);
psi_22 = @(x,y) (2/L).*sin((2*pi.*x)/L).*sin((2*pi.*y)/L);
psi_23 = @(x,y) (2/L).*sin((2*pi.*x)/L).*sin((3*pi.*y)/L);
psi_32 = @(x,y) (2/L).*sin((3*pi.*x)/L).*sin((2*pi.*y)/L);
psi_33 = @(x,y) (2/L).*sin((3*pi.*x)/L).*sin((3*pi.*y)/L);
rho_11 = @(x,y) real(psi_11(x,y).*conj(psi_11(x,y))); % Probability density of the electron in the box
rho_12 = @(x,y) real(psi_12(x,y).*conj(psi_12(x,y)));
rho_21 = @(x,y) real(psi_21(x,y).*conj(psi_21(x,y)));
rho_22 = @(x,y) real(psi_22(x,y).*conj(psi_22(x,y)));
rho_23 = @(x,y) real(psi_23(x,y).*conj(psi_23(x,y)));
rho_32 = @(x,y) real(psi_32(x,y).*conj(psi_32(x,y)));
rho_33 = @(x,y) real(psi_33(x,y).*conj(psi_33(x,y)));
figure(1)
hold on
a_1 = mesh(x,y,psi_11(x,y),'k'); c_1 = "\psi_11(x,y)"; % psi_11, psi_12, psi_21, psi_22, psi_23,
a_2 = mesh(x,y,psi_12(x,y),'r'); c_2 = "\psi_12(x,y)"; % psi_32, and psi_33 are functions of x and y
a_3 = mesh(x,y,psi_21(x,y),'g'); c_3 = "\psi_21(x,y)";
a_4 = mesh(x,y,psi_22(x,y),'b'); c_4 = "\psi_22(x,y)";
a_5 = mesh(x,y,psi_23(x,y),'m'); c_5 = "\psi_23(x,y)";
a_6 = mesh(x,y,psi_32(x,y),'y'); c_6 = "\psi_32(x,y)";
a_7 = mesh(x,y,psi_33(x,y),'c'); c_7 = "\psi_33(x,y)";
xlabel('x (nm)')
ylabel('y (nm)')
zlabel('\psi_n_xn_y(x,y)')
legend([a_1,a_2,a_3,a_4,a_5,a_6,a_7], [c_1,c_2,c_3,c_4,c_5,c_6,c_7], 'Location', 'Best')
figure (2)
hold on
b_1 = mesh(x,y,rho_11(x,y),'k'); d_1 = "\rho_11(x,y)"; % rho_11, rho_12, rho_21, rho_22,rho_23,
b_2 = mesh(x,y,rho_12(x,y),'r'); d_2 = "\rho_12(x,y)"; % rho_32, and rho_33 are functions of x and y
b_3 = mesh(x,y,rho_21(x,y),'g'); d_3 = "\rho_21(x,y)";
b_4 = mesh(x,y,rho_22(x,y),'b'); d_4 = "\rho_22(x,y)";
b_5 = mesh(x,y,rho_23(x,y),'m'); d_5 = "\rho_23(x,y)";
b_6 = mesh(x,y,rho_32(x,y),'m'); d_6 = "\rho_32(x,y)";
b_7 = mesh(x,y,rho_33(x,y),'m'); d_7 = "\rho_33(x,y)";
xlabel('x (nm)')
ylabel('y (nm)')
zlabel('\rho_n_xn_y(x,y)')
legend([b_1,b_2,b_3,b_4,b_5,b_6,b_7], [d_1,d_2,d_3,d_4,d_5,d_6,d_7], 'Location', 'Best')

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回答（1 个）

KSSV
KSSV 2022-1-28
Replace the line:
a_1 = mesh(x,y,psi_11(x,y),'k');
with
a_1 = mesh(x,y,psi_11(x,y));
You have already provided color data i.e. Z data.

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