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z(i)=(0.5^((i-1)/x)-0.5^(i/x))*(1-(y-1)/(y*0.5^(i/x)-0.5^((i-1)/x))

z=z(1)+z(2)+z(3)+......+z(i-1)+z(i)+z(i+1)+......+z(x-1)+z(x)

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[x,y] = meshgrid(1:1:40,1:1:5);

z=fun(x,y);

surf(x,y,z);

function [z] = fun(x,y)

z=0;

for i=1:x
   
z=z+(0.5.^((i-1)./x)-0.5.^(i./x)).*(1-(exp(y)-1)./(exp(y).*0.5.^(i./x)-0.5.^((i-1)./x)));

end

end
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