how to make heatmap smooth?

I want to make heatmap smooth, but cell edge can not be without.

Please tell me the way .

D1 = rad2deg(-4.71);
D2 = rad2deg(-3.14);

Theta_Theory = linspace(D2, D1, 10000);     
Velocity_Theory = linspace(-100,0,10000);          

figure(1);
[Theta_Theory, Velocity_Theory] = meshgrid(Theta_Theory, Velocity_Theory);
x1 = sin(Theta_Theory);  
y1 = -cos(Theta_Theory);
T =  sqrt(2*abs(y1)/9.8); 
target = 10;
S_z = x1 + abs(Velocity_Theory.*cos(Theta_Theory)).*T.';
z = -abs(S_z -target);
h = pcolor(Theta_Theory, Velocity_Theory,z);


shading interp
set(h,'EdgeColor','none','linestyle','none');
colorbar;
colormap(jet(256));

[KSSV]

As you are considering the angles in degrees, you should use sind and cosd

Answer 1

[KSSV]

D1 = -4.71 ;
D2 = -3.14 ; 

Theta_Theory = linspace(D2, D1, 1000);     
Velocity_Theory = linspace(-100,0,1000);          

figure(1);
[Theta_Theory, Velocity_Theory] = meshgrid(Theta_Theory, Velocity_Theory);
x1 = sin(Theta_Theory);  
y1 = -cos(Theta_Theory);
T =  sqrt(2*abs(y1)/9.8); 
target = 10;
S_z = x1 + abs(Velocity_Theory.*cos(Theta_Theory)).*T.';
z = -abs(S_z -target);
h = pcolor(Theta_Theory, Velocity_Theory,z);


shading interp
set(h,'EdgeColor','none','linestyle','none');
colorbar;
colormap(jet(256));

[ryunosuke tazawa]

Thanks a lot. if I want to increased number of x and y values , should I do?

The error hapend " low-level graphics"

Theta_Theory = linspace(D2, D1, 1000);     
Velocity_Theory = linspace(-100,0,1000);          

↓
Theta_Theory = linspace(D2, D1, 10000);     
Velocity_Theory = linspace(-100,0,10000);