how to plot radiation pattern in matlab

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Hi, mns. This is my m-file for 3D radiation pattern in linear scale.
First, I get radiation pattern information in spherical coordinate from HFSS.
Then I need to extract directivities depends on phi, theta.
Anyway, the important thing is that you know values in spherical coordinates then should transfer to rectangular coordinates.
You also consider meshgrid depends on your simulation settings(phi, theta steps).

One thing I want to do is, wanna plot my directivity in dB scale. I'm in trouble.

Thanks.

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c=importdata('F:\2014_SPRC\Matlab\Prob1\5GHz_radiation pattern.xlsx');
Directivity=c.data(:,3); %where my directivity values
 
r = zeros(19,37); % theta, phi, 10 degree step
 
n=0;
for i=1:size(r,1)
    for j=1:size(r,2)
       r(i,j) = Directivity(n+j);
    end
       n = size(r,2)*i;
end;
 
[phi,theta] = meshgrid(linspace(0,360,37), linspace(0,180,19)); % 10 degree step
 
 
x = r.*sin(theta*pi/180).*cos(phi*pi/180);
y = r.*sin(theta*pi/180).*sin(phi*pi/180);
z = r.*cos(theta*pi/180);
figure
surf(x,y,z,r);
shading interp;

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