store variables in a for loop

Question

Davide Cerra 2020-4-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/519658-store-variables-in-a-for-loop

评论： Sriram Tadavarty 2020-4-21

采纳的回答： Sriram Tadavarty

在 MATLAB Online 中打开

Hello,

i m trying to obtain a set of coordinates for this:

function [x, y] = gencircle(xo,yo,r,N)
x=(xo+r*cos(theta))';
y=(yo+r*sin(theta))';
clear all
xo=[1 2 3 4 5 6 7 8];
yo=[-1 -0.5];
r=0.01;
N=10;
theta=2*pi/N*(1:N+1);
th=0.00235;
for j=1:length(yo)
    for i=1:length(xo)
        [xout(:,i), yout(:,j)]=gencircle(xo(i),yo(j),r,N)
        [xin(:,i), yin(:,j)]=gencircle(xo(i),yo(j),r-th,N)
    end
end
for j=1:length(yo)
    for i=1:length(xo)
        aa=[xout(:,i),yout(:,j)]
    end
end

how can i store the vector aa for each loop?

Thanks

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Answer 1

Sriram Tadavarty 2020-4-21

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/519658-store-variables-in-a-for-loop#answer_427410

编辑：Sriram Tadavarty 2020-4-21

在 MATLAB Online 中打开

Hi Davide,

You can make the following modification to the code as shown below, which stores all the loop iteration values in the variable aa:

clear all
xo=[1 2 3 4 5 6 7 8];
yo=[-1 -0.5];
r=0.01;
N=10;
theta=2*pi/N*(1:N+1);
th=0.00235;
for j=1:length(yo)
    for i=1:length(xo)
        [xout(:,i), yout(:,j)]=gencircle(xo(i),yo(j),r,theta);
        [xin(:,i), yin(:,j)]=gencircle(xo(i),yo(j),r-th,theta);
    end
end
aa = zeros(size(xout,1),2,length(yo)*length(xo)); % Initialize the variable
tmp = 1;
for j=1:length(yo)
    for i=1:length(xo)
        aa(:,:,tmp)=[xout(:,i),yout(:,j)];
        tmp = tmp+1;
    end
end
% aa will be a variable of size length(xout) x 2 x (loop iterations)
% loop iterations here is equal to the product of length(yo) and length(xo) (implies 16)
% Each iteration value can be accessed by indexing from 3rd dimension,
% implies for example fifth iteration can be accessed with aa(:,:,5)
function [x, y] = gencircle(xo,yo,r,theta)
x=(xo+r*cos(theta))';
y=(yo+r*sin(theta))';
end