Time series, months and sequence

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Nguyen Bao 2020-4-17

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评论： Nguyen Bao 2020-4-18

采纳的回答： Ameer Hamza

Hi everyone,

I have 12 series:

x1 = [1990M1, 1991M1, 1992M1 .....2020M1]

x2=[1990M2, 1991M2, 1992M2 ...2020M2]

...

x12=[1990M12, 1991M12, 1992M12 ...2020M12]

Now I would like a time sereis:

x= [1990M1, 1990M2, 1990M3 ...2020M12].

Please give me a hint.

Many thanks,

Bao

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Mehmed Saad 2020-4-17

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if they are of same length just put

y = [x1;x2;x3;x4;x5;x6;x7;x8;x9;x10;x11;x12];
x = y(:,1);

Nguyen Bao 2020-4-18

Thanks, but this is not the solution.

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采纳的回答

Ameer Hamza 2020-4-17

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编辑：Ameer Hamza 2020-4-18

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First, you should avoid creating variables names like x1, x2, ..., xn. This thread explains the issues with this approach in detail: https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Now, if you want to correct this issue by combining all these values in a single array, then you can use eval(). Note that using frequently using eval() in your code is not a very good idea and should be avoided, but you can use it once to fix the initial mistakes. This code shows an example.

x1 = [1 2 3];
x2 = [4 5 6];
x3 = [7 8 9];
x4 = [10 11 12];
x5 = [13 14 15];
x = [];
for i=1:5 % numbers of the x variables
    eval(['x = [x; x' num2str(i) '];']);
end
x = x(:)';