CODEWITHSUNDEEP
matlabstructure
gabboshow
gabboshow

Reputation: 5579

read data from a structure in matlab

I have to load some data in a structure.

I do it inside a function.

assuming that my structure is called

loaddata

and the data are in

loaddata.corrected_data

how can I access to it within a function?

function loaddata_struct(path,namestruct)
  loaddata = load(path);
  data = loaddata.corrected_data; % this should change depending on the argument of the function (namestruct in this case)
end

how can I pass the name of the structure? in this case corrected_data...

Upvotes: 0

Views: 1594

Answers (4)

ymihere
ymihere

Reputation: 381

The following code will return the structure's field with the name passed to loaddata_struct function:

function data = loaddata_struct(path,namestruct)
  loaddata = load(path);
  data = loaddata.(namestruct);
end

Upvotes: 1

Ander Biguri
Ander Biguri

Reputation: 35525

Do it as text and use isfield and eval. Isfield will check if the string is a field of the struct, and if it is, then use eval to evaluate loaddata.fieldname. Using isfield you make sure you never get an error, and you can do things in the else, like finding the data that has the most similar name to the one inserted, for example.

function loaddata_struct(path,fieldname)
  loaddata = load(path);
  if isfield(loaddata ,fieldname)
     data = eval(strcat('loaddata.',fieldname));
  else
     error('Heeey mate, thats not a field')
  end
end

Upvotes: -1

Jonas
Jonas

Reputation: 74940

You can use dynamic field names like so:

fieldOfInterest = 'corrected_data';

data = loaddata.(fieldOfInterest);

If you're loading from file, you can also access the data directly

data = load('theDataFile.mat','-mat',fieldOfInterest)

Upvotes: 2

Divakar
Divakar

Reputation: 221684

Use getfield and if you need to work on a 1 x N sized struct array -

function loaddata_struct(path,fname)

loaddata = load(path);
for k1 = 1:numel(loaddata)
    data{k1} = getfield(loaddata(k1),fname);
end

return;

Thus, you can use it like this - loaddata_struct(path,'corrected_data')

Upvotes: 1

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