gradient arrows plot in matlab

Hello, the code bellow creates a shape as shown bellow.How ever i would like to convert this plot into gradient arrows shape as shown bellow.

is it possible in matlab?

Thanks.

a=0.819*10^(-3);
b=2.73*10^(-3);
Vo=15;
rho=linspace(a,b,100);
%Updated t
t=linspace(0,2*pi,360);
[rr,tt]=meshgrid(rho,t);
func_grid=Vo*(b/a)*(1./rr);
%Modify the inputs to surf to obtain a polar plot
surf(rr.*sin(tt),rr.*cos(tt),func_grid)
shading interp
colorbar
%change view as per requirement
view(2)

Answer 1

[KSSV]

a=0.819*10^(-3);
b=2.73*10^(-3);
Vo=15;
rho=linspace(a,b,100);
%Updated t
t=linspace(0,2*pi,360);
[rr,tt]=meshgrid(rho,t);
func_grid=Vo*(b/a)*(1./rr);
[u,v] = gradient(func_grid) ; 
%Modify the inputs to surf to obtain a polar plot
pcolor(rr.*sin(tt),rr.*cos(tt),func_grid)
shading interp
colorbar
hold on
quiver(rr.*sin(tt),rr.*cos(tt),v,u,'k')

[fima v]

Hello, How can i make the arrow density less and array size larger.