# i have create a figure like circle

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Rezaul hasan on 25 May 2022
Commented: DGM on 25 May 2022 i have to create a figure like this picture. Given value is r= 262pixel, Wmax= 10.6pi , equation is w=Wmax*(1-(x^2+y^2)/(r^2))^2 , x and y are two variables, we cannot know their values.x and y are satisfied the following condition:
sqrt(x^2+y^2)<=r.
i did code this one . but this isn't working. plz anyone help me what is the wrong here. i will be greatful to you.
clear all
format long
r=262;
Wmax=10.6*pi;
syms x y;
xlabel('x')
ylabel('y')
if sqrt(x^2+y^2)>=r
w=0;
elseif sqrt(x^2+y^2)<r
w=Wmax*(1-(x^2+y^2)/r^2)^2;
end
plot(w)

DGM on 25 May 2022
Try something like this.
% parameters
rmax = 262;
Wmax= 10.6*pi;
% create values
x = -rmax:rmax;
y = x.';
rsq = (x.^2 + y.^2);
w = Wmax*(1-rsq/(rmax^2)).^2;
% truncate background
mk = rsq > rmax^2;
w(mk) = 0;
% show result
imshow(w,[]) ##### 2 CommentsShowHide 1 older comment
DGM on 25 May 2022
You mean this?
% parameters
rmax = 262;
Wmax= 10.6*pi;
% create values
x = -rmax:rmax;
y = x.';
rsq = (x.^2 + y.^2);
w = Wmax*(1-rsq/(rmax^2)).^2;
w = 1-cos(w);
% truncate background
mk = rsq > rmax^2;
w(mk) = 0;
% show result
imshow(w,[]) R2020a

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