How to draw this figure?

I have these figures with the equation also shown. I tried making this. But I did not got the expected result. Please give me some ideas. here dij is the distance. ru = 10, rs = 5; a = 0.5, m = 0.5;

Answer 1

[Iman Ansari]

Hi.

m=0.5;
[x,y]=meshgrid(-11:.1:11);
d=sqrt(x.^2+y.^2);
S=d;
S(d>10)=0;
S(d<=10&d>5)=exp(-0.5.*(d(d<=10&d>5)-5).^m);
S(d<=5)=1;

surf(x,y,S)
axis([-10 10 -10 10 0 1])
shading interp

[Sabarinathan Vadivelu]

Thank you very much.