MATLAB: How Can I Assign variable Name

calling variabledatafunctionsavevariable

Hi guys, I have some kinds of a data, that is in the variable called as First, and each day I have to update that data, but I should not lost the last data with respective variable name, so when I update data I have to create new variable for this updated data. well it is easy when you are making it manually, but in my case it should create automatically and the name of new variables should be the date of updated day for example today is 1/14/2015 so if i updated today variable name should be 1/14/2015. Any ideas would be a great job for me.

Best Answer

https://www.mathworks.com/help/matlab/matlab_prog/string-evaluation.html

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

Related Solutions

MATLAB: How to insert a int value into the name of a variable (for loop)

Just use a non-scalar structure:

data(1).date = ...
data(2).date = ...
data(3).date = ...
data(4).date = ...

This makes it trivially easy to access the data using indexing, which is fast and efficient, e.g. the second date:

data(2).date

Not only that you can very conveniently convert any field into a comma-separated list, which makes it simple to join the field values together into one array, e.g. to put all the dates into one cell array:

out = {data.date}

or to assign them in exactly the same way.

While it is possible to define structure fieldnames dynamically, in your case (you proposed numbered field names) it serves no purpose whatsoever and will only make your code slow and complicated.

Writing neat efficient MATLAB code is easy, once you avoid bad design decisions like putting meta-data into field or variable names:

https://www.mathworks.com/matlabcentral/answers/228557-experts-of-matlab-how-did-you-learn-any-advice-for-beginner-intermediate-users

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

MATLAB: Saving a new table for every loop iteration

Don't do that. Dynamic variable creation is a bad idea and totally unnecessary.

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

Use a cell array.

 data = cell(variable_max,1);
 column_name  = cell(variable_max,1);
 %and preallocate other variables, this is important if you want your code to be faster
 for k=1:variable_max
   ...
   ...
   column_name {k,1} = ...
   data{k,1} = dataextract(...)
 end

Now you have all your tables under one variable. You can access them by indexing.

Best Answer

Related Solutions

MATLAB: How to insert a int value into the name of a variable (for loop)

MATLAB: Saving a new table for every loop iteration

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