combining variables into one matrix -from a single mat file, problem with struct to double conversion (getfield)

I want to combine 254 files included in a single .mat file to produce a matrix 723 x 3127 x 254, with each variable being 723 x 3127. I have tried below, with help from another question I asked here:

clear all clc close all

load 'TJJ.mat'

% attempt to put all arcs together..

adata = NaN(723,3127,254);

 for k=1:254
     k
     tic

     % create the file name
     filename = sprintf('TJJ_arc%03d.mat',k);

     % load the data
     data = load(filename);
     d = getfield(data,'data');

     % save the data
     adata(:,:,k) = d;
     toc

 end

at the moment, I get an error with the getfield command. I want to convert the 1x1 struct file to double...

Can someone help me?

thanks in advance! Michael

[Aurele Turnes]

The getfield function can be used to access a field in a structure, a fints object, or a vrnode object. If data is a structure, the code

d = getfield(data,'data');

is accessing the value of the field 'data' in the structure data, and is equivalent to doing

d = data.data;

This is what getfield does under the hood for a structure.

Is this what you are trying to do? What is the exact error message you are getting? You can check that data is a structure by typing class(data) in the MATLAB Command Window. You can also check that data has a field named 'data' by typing fieldnames(data) in the Command Window.