How to save a variable in the same mat.file each time a function runs?

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Nariç Durmus 2017-4-13

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编辑： Stephen23 2017-4-13

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I have a matlab function which runs in combination with BCI2000. I want to save a variable each time the function re-runs to do the calculations for the BCI server (real-time monitoring).

I tried something like this:

pp = 1;  %begin point
variab= [];
for i= 1:1000
  np(i) = pp + size(out_signal(i),1)-1; %next point
variable_new = [out_signal]
   variab = [variab variable_new];
    %variable(i) = [pp,];  % X moet je nog even bedenken hoe dat zit met variabelen/cells etc.  
                           %(pp:np,:) voor size(A,2)>1
    pp = np +1;
    end
    save ('variable.mat','variab')

This does not work. How can I save the outcome signal each time the function runs?

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Stephen23 2017-4-13

编辑：Stephen23 2017-4-13

The easiest way would be to use matfile. Then you can simply access the variable in the .mat file by using indexing.

Whatever you do, do NOT try to create numbered variables: creating or accessing numbered variables makes slow, buggy, and obfuscated code:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

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回答（1 个）

KSSV 2017-4-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/335195-how-to-save-a-variable-in-the-same-mat-file-each-time-a-function-runs#answer_262885

Go through the link: https://in.mathworks.com/matlabcentral/answers/33113-append-save-same-variable-with-updated-values-into-mat-file-row-wise

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