function assignin overwrites my data
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Hello! I'm trying to save a matrix in the matlab workspace with the function assignin, because that's the only one I know that does this, but the problem is that I don't know if I can manipulate it in order to not overwrite the data I acquire in which loop.
So I'm using this line of code:
assignin('base', varName, captureData);
But the matrix it generates only has the last second of data it captures (each loop is one second) and I need it to save all of the data it gets. I can save it to a txt file, which I'm already doing. But I want to manipulate the generated matrix so I really need the data to be inside of matlab workspace (I'm acquiring data in real time).
Would really appreciate some help, please keep in mind I'm very new to matlab.
2 Comments
Rik
on 9 Jul 2021
Why are you using assignin instead of using functions (or even classes, if you want more persistence)?
Accepted Answer
Matt J
on 9 Jul 2021
Edited: Matt J
on 9 Jul 2021
Do not return a result to the base workspace in each pass through the loop. At the completion of your loop, you should have accumulated a vector containing all the results. You should pass that back to the base workspace.
6 Comments
Matt J
on 9 Jul 2021
If you find a way for it to restart the variable when I run the main function again that would be great.
persistent cumulativeData
cumulativeData=[cumulativeData;captureData];
assignin('base', varName, cumulativeData);
Okay I just realized that the variable is only saved after I run the code, I needed to be able to change values of the matrix while the code was running.
Not sure i understand what you wrote here, but with the above, you can insert any changes you wish to cumulativeData before the call to assignin.
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