what's the problem in my loop I couldn't understand in this

Question

SAHIL SAHOO 2022-8-29

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1789305-what-s-the-problem-in-my-loop-i-couldn-t-understand-in-this

回答： KSSV 2022-8-29

采纳的回答： KSSV

在 MATLAB Online 中打开

x=linspace(-1,1,256);

[X,Y]=meshgrid(x,x);

r=sqrt(X.^2+Y.^2);

R=0.05;

t = 0.3;

l= 0:36:360;

for i = 1:length(l)

h(i)= t*cos(l(i)); k(i)= t*sin(l(i));

p(i)=sqrt((X-h(i)).^2+(Y-k(i)).^2);

A(i)=(p(i)<R);

end

imagesc(x,x,A(1));colorbar

%this what i want to make.
x=linspace(-1,1,256);
[X,Y]=meshgrid(x,x);
r=sqrt(X.^2+Y.^2);
R=0.05;
t = 0.5;
% i want to apply loop here so it shortnen my code.
h= t*cos(0); k= t*sin(0);
r1=sqrt((X-h).^2+(Y-k).^2);
A1=(r1<R);
h= t*cos(36); k= t*sin(36);
r2=sqrt((X-h).^2+(Y-k).^2);
A2=(r2<R);
h= t*cos(72); k= t*sin(72);
r3=sqrt((X-h).^2+(Y-k).^2);
A3=(r3<R);
h= t*cos(108); k= t*sin(108);
r4=sqrt((X-h).^2+(Y-k).^2);
A4=(r4<R);
h= t*cos(144); k= t*sin(144);
r5=sqrt((X-h).^2+(Y-k).^2);
A5=(r5<R);
h= t*cos(180); k= t*sin(180);
r6=sqrt((X-h).^2+(Y-k).^2);
A6=(r6<R);
h= t*cos(216); k= t*sin(216);
r7=sqrt((X-h).^2+(Y-k).^2);
A7=(r7<R);
h= t*cos(252); k= t*sin(252);
r8=sqrt((X-h).^2+(Y-k).^2);
A8=(r8<R);
h= t*cos(288); k= t*sin(288);
r9=sqrt((X-h).^2+(Y-k).^2);
A9=(r9<R);
h= t*cos(324); k= t*sin(324);
r10=sqrt((X-h).^2+(Y-k).^2);
A10=(r10<R);
h= t*cos(360); k= t*sin(360);
r12=sqrt((X-h).^2+(Y-k).^2);
A12=(r12<R);
A = A1+ A2 + A3 +A4 + A5 + A6 + A7 + A8 + A9+ A10 + A12;
imagesc(x,x,A);colorbar

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Answer 1

KSSV 2022-8-29

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1789305-what-s-the-problem-in-my-loop-i-couldn-t-understand-in-this#answer_1036400

在 MATLAB Online 中打开

x=linspace(-1,1,256);
[X,Y]=meshgrid(x,x);
r=sqrt(X.^2+Y.^2);
R=0.05;
t = 0.3;
l= 0:36:360;
A = cell(1,length(l)) ;
for  i = 1:length(l)
    h= t*cos(l(i));
    k= t*sin(l(i));
    p=sqrt((X-h).^2+(Y-k).^2);
    A{i}=(p<R);
    figure
    imagesc(A{i});
end