MATLAB: Choosing a specific data from a structure

fullfilefunctionloadstructure

Hello,

I'm trying to access a structure data by using this code :

File      = fullfile(Path, sprintf('%s.mat',Name));
FileData  = load(File, Name2);
Alpha     = FileData.Name2.Vectors;

Where Path is the path where the structure is stored; Name is the name of the structure and Name2 is the name of one of the .mat file stored in the structure. All works fine util the loading process.

Now i want to choose a specific data stored in Name2.mat which is "Vectors". The problem is that "Name2" is an input of a function so "FileData.Name2.Vectors" won't works in a function. i want to know is there a way to fix this issue?

thank you for your help

Best Answer

Alpha     = FileData.(Name2).Vectors;

https://www.mathworks.com/help/matlab/matlab_prog/generate-field-names-from-variables.html

Related Solutions

MATLAB: How to avoid duplicate struct fields when loading structs

It appears that the variables inside the .mat files were unfortunately also named using the dates, rather than simply using one fixed name for all of the files (which would simplify the file importing code). Here is one solution:

S = load(...);
Data.(main) = S.(main);

If the variable name in the file does not match main then this code will fail. If there is only one variable in each file then you can import this variable regardless of its name:

C = strut2cell(load(...));
Data.(main) = C{1};

Note that forcing meta-data (such as dates) into variable or fieldnames results in fragile, slow, and complex code to process that data. Meta-data is data its own right, and should be stored in a variable, rather than in the name of a field or variable. For example, your data would likely be better stored in a non-scalar structure:

S(1).data = [...]
S(1).name = 'D20190501.mat';
S(2).data = [...]
S(2).name = 'D20190503.mat';
...

https://www.mathworks.com/help/matlab/matlab_prog/access-multiple-elements-of-a-nonscalar-struct-array.html

MATLAB: Load a matlab file

Try this

fullFileName = fullfile(pwd, 'All_data.mat');
if exist(fullFileName, 'file')
  storedStructure = load(fullFileName)
  data1 = storedStructure.data1
  data2 = storedStructure.data2
  data3 = storedStructure.data3
else
  warningMessage = sprintf('Error: the file does not exist:\n%s', fullFileName);
  uiwait(warndlg(warningMessage));
end

Best Answer

Related Solutions

MATLAB: How to avoid duplicate struct fields when loading structs

MATLAB: Load a matlab file

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