save data in for loops

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yunwei hu 2020-2-10

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编辑： Ajay Kumar 2020-2-11

采纳的回答： Ajay Kumar

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Hi everyone,

I am trying to save my data into a matrix, each time two columns as X and Y.

but the codes don't work.

Can anyone explain and help?

Thanks a lot.

coordinate= zeros();
for a=1:21
Z=[X Y];
X = snakes{1,a}.x;
Y = snakes{1,a}.y;
coordinate((a),:)= Z;
end

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Ajay Kumar 2020-2-10

what is the format of those?

Could you upload x, y and snakes here.

yunwei hu 2020-2-10

snakes.mat

i uploaded the snakes.

x and y are all inside of it.

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采纳的回答

Ajay Kumar 2020-2-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/504656-save-data-in-for-loops#answer_414952

编辑：Ajay Kumar 2020-2-11

在 MATLAB Online 中打开

Yes, You are trying to assign 2 matrices of different size. Try this:

coordinate= zeros(41,1);
for a=1:21
    X = snakes{1,a}.x;
    Y = snakes{1,a}.y;
    % Z=[X Y];
    if a == 1
        coordinate(:,end)= X;
        coordinate(:,end+1) = Y;
    else
        coordinate(:,end+1)= X;
        coordinate(:,end+1) = Y;
    end
end