Having problem plotting with surfc function

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Mukul
Mukul on 14 May 2018
Commented: Mukul on 16 May 2018
phi21 = linspace(-Tn,Tn,ns);
phi31 = linspace(-Tn,Tn,ns);
Tn=100;
ns=30;
P1=0;
alpha = 0;
beta = 0;
gama = 0;
[phi_21,phi_31] = meshgrid(phi21,phi31);
n=0;
for n=1:(2*n-1):21
P1(n)=(k12.*cos(alpha*pi*n/360).*cos(beta*pi*n/360).*sin(phi_21*pi*n/180))+(k13.*cos(alpha*pi*n/360).*cos(gama*pi*n/360).*sin(phi_31*pi*n/180))
P1=P1+P1(n);
end
surfc(phi_21,phi_31,P1); colorbar;
I would like to surfc plot of equation P1 with respect to phi_21 and phi_31 upto 21st harmonic where n=1,3,5,7... this shows a dimension error like this "The surface Z must contain more than one row or column". Could anyone please help me with this?

Accepted Answer

Image Analyst
Image Analyst on 15 May 2018
You need to define Tn, ns, k12, and k13. Then get rid of the for loop.
% Guess at values.
Tn = .5;
ns = 100;
k12=4;
k13 = 3;
phi21 = linspace(-Tn,Tn,ns);
phi31 = linspace(-Tn,Tn,ns);
Tn=100;
ns=30;
P1=0;
alpha = 0;
beta = 0;
gama = 0;
[phi_21, phi_31] = meshgrid(phi21, phi31);
n = phi_21;
P1=(k12.*cos(alpha*pi*n/360).*cos(beta*pi*n/360).*sin(phi_21*pi*n/180))+...
(k13.*cos(alpha*pi*n/360).*cos(gama*pi*n/360).*sin(phi_31*pi*n/180));
surfc(phi_21,phi_31,P1, 'EdgeColor', 'none');
colorbar;
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0, 0.04, 1, 0.96]);
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