I want to access the variable outside the loop or want to change the variables value in loop but in every iteration

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Dhenish 2023-12-8

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评论： Florian Bidaud 2023-12-11

I am getting real time data in every 5 seconds (with pause) with a while loop and make varibales to store that data which come from amazon s3 service . How can I use the current data outside the loop and proceed to do computation with the most current data ? When the loop is running I can not do anything and not get the letest value of the variables in base workspace until it is finished.. And I need to create infinite loop to continuously get the data.

Here I got the variables in baseworkspace when I stop the script to running but I want it in every 5 seconds when when one iteration is finished of while.

while 1
options = weboptions("ContentType", "text");
jsonData = webread('https://amazon-bucket.s3.amazonaws.com/Testdata', options);
% Convert the JSON data to a character vector
jsonDataChar = char(jsonData);
% Parse the JSON data into a MATLAB structure
dataRcv = jsondecode(jsonDataChar);
% Extract the desired values
V = dataRcv.V;
Hydro = dataRcv.Hydro;
Lvl = dataRcv.Lvl; % and other variables 
disp('Running....');
pause(5)
end

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Dyuman Joshi 2023-12-8

What computation do you have to do?

You can define a function and call it using the data for each iteration of the while loop.

Dhenish 2023-12-11

I want to use varibables for Simulink so as per my knowledge I can use varibables which are store in base workspace.

So I want to store all the variable in base workspace and that data are changing in every 5 seconds so I used while loop to run the script in every 5 seconds. But the problem is when the loop is running I can not do anything and not get the letest value of the variables in base workspace.

Function for what ??

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Answer 1

Florian Bidaud 2023-12-8

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https://ww2.mathworks.cn/matlabcentral/answers/2057894-i-want-to-access-the-variable-outside-the-loop-or-want-to-change-the-variables-value-in-loop-but-in#answer_1367899

编辑：Florian Bidaud 2023-12-8

One solution could be to save it in a mat file at each step, then you have full access to it with a parfeval or any parallel computing tool for example.

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Dhenish 2023-12-11

在 MATLAB Online 中打开

For that purpose can I save file inside the while loop ?? With this line of code ??

save result.mat dataRcv -mat;

Here I have a json structure inside the dataRcv variable and all the variables which I need that all are in dataRcv. So If I got the dataRcv then I computation what I want.

Florian Bidaud 2023-12-11

Yes you can

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I want to access the variable outside the loop or want to change the variables value in loop but in every iteration

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