How to save streaming data to Matlab workspace

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want2know 2015-12-18

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评论： Renato Agurto 2015-12-18

Hi,

I am trying to save real-time streaming data obtained from hardware to Matlab workspace, I use the following command: My issue is, it only saved the last set of data, but not all data.

To save all variables from the workspace in binary MAT-file, test.mat, type

save test.mat

When I tried with this

save('test.mat','-append'); ,

it makes my program halt, so I would like to know what is the correct way to achieve this?

Thank you.

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Renato Agurto 2015-12-18

Hi. Do you get an error message? Do the saved variables have the same name? maybe they are constantly overwritten

want2know 2015-12-18

编辑：want2know 2015-12-18

Thank you, yes you are right that they have same name and they are constantly overwritten, i did not get error message, I still get the file saved but i noticed that it only showed the latest set of data, what should I do to avoid this? I want it to save every set at each time step

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Answer 1

Renato Agurto 2015-12-18

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https://ww2.mathworks.cn/matlabcentral/answers/260852-how-to-save-streaming-data-to-matlab-workspace#answer_203672

编辑：Renato Agurto 2015-12-18

在 MATLAB Online 中打开

Hi, I don't have experience in real-time streaming but I would try to have a counter (t = 1:100) and save the variable(s) in a cell. For example your variables are var1, var2,... var5 and they are overwritten every second.

Here will all data be stored in a big cell myVar

myVar{t} = {var1, var2, var3, var4, var5};

or append every new variable. Here you get 5 "big" variables: v1,v2,v3,v4 & v5

 %initialize
 v1 = [];
 v2 = [];
 v3 = [];
 v4 = [];
 v5 = [];

And at every second append the data:

 v1 = [v1, var1];
 v2 = [v2, var2];
 ...

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want2know 2015-12-18

Thank you, do you mind to explain further as I don't get it, sorry..I do not want to overwrite variables, for example, I have five variables in the beginning of my test, I will still have only five variables in the end of my test, but I want to save each value of all five variables from t=1 to t=100 seconds, so I will have 100 sets of five variables (presuming one set data is saved every second)

Renato Agurto 2015-12-18