How to draw this figure?

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Sabarinathan Vadivelu
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;

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Iman Ansari
Iman Ansari 2013-5-4
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

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