How to save streaming data to Matlab workspace

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want2know
want2know 2015-12-18
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.
  2 个评论
Renato Agurto
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
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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回答（1 个）

Renato Agurto
Renato Agurto 2015-12-18
编辑：Renato Agurto 2015-12-18
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];
...
  2 个评论
want2know
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
Renato Agurto 2015-12-18
Hi. I tried to explain it better (see my edited answer).

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