Color of surf function

I wamt to plot 3 spheres with different colours. But i am unable to do it. I am sharing the code as well. Thank you for your help.

x_min = 5; x_max = 45; y_min = 5; y_max = 45; z_min = 5; z_max = 45;
centre_x(1) = x_min + rand(1)*(x_max-x_min); 
centre_y(1) = y_min + rand(1)*(y_max-y_min);
centre_z(1) = z_min + rand(1)*(z_max-z_min);
radius(1) = 4+rand(1)*(5-4);
volume = (4/3)*pi*radius(1)^3; i=2; iteration=0;
plot_sphere(centre_x(1),centre_y(1),centre_z(1),radius(1));

%% plot_sphere function

function [] = plot_sphere(xi,yi,zi,r)
[x, y, z] = sphere;
x = x.*r;
y= y.*r;
z = z.*r;

surf(x+xi, y+yi, z+zi);
%colormap summer
mymap = [1 0 1];
%cmap = 
colormap(mymap);
hold on;
axis equal
end

Answer 1

[Walter Roberson]

You can only use one colormap per axes. You need to use different axes, or you need to supply "CData" in the surf() call passing rgb color data

Answer 2

[KSSV]

mymap = [1 0 0];