MATLAB: How to create multi dimensional dynamic structure array in loop

structures

Hi all I want to have a structure like:

DataStruct.name(i)

 name(i) include three items: Round, Trial and Paradigm

DataStruct.value(i)

value(i) include three itmes: LocX, LocY and LocZ

Best Answer

DataStruct.name(i) = struct('Round', value_for_round, 'Trial', value_for_trial, 'Paradigm', value_for_paradigm);

And likewise for value(i) with fields LocX LocY and LocZ

Related Solutions

MATLAB: Import data from txt file

This uses readtable() to read in your txt file and it uses regexp() with the 'tokens' flag to pull out relevant data.

%% Import data into table
opts = delimitedTextImportOptions("NumVariables", 1);
opts.DataLines = [1, Inf];
opts.VariableNames = "txt";
test1 = readtable("test1.txt", opts);  %file is on path
%% Extract desired data 
% Pull out the frame and ts data
tokens = regexp(test1.txt, 'frame (\d+) ts (\d+.\d+)', 'tokens');
frame_ts = cell2mat(cellfun(@str2double,[tokens{:}]','UniformOutput',false));
% Pull out loc coordinates 
tokens = regexp(test1.txt, '^loc (-?\d+.\d+) (-?\d+.\d+) (-?\d+.\d+)', 'tokens'); 
loc = cell2mat(cellfun(@str2double,[tokens{:}]','UniformOutput',false));
% Check that frame_ts and loc have same number of rows.
if size(frame_ts,1) ~= size(loc,1)
    error('''frame_ts'' and ''loc'' have different number of rows.')
end
%% Put data into table
T = array2table([frame_ts, loc], 'VariableNames', {'frame', 'timestamp', 'loc_x', 'loc_y', 'loc_z'});
% inspect first few rows
head(T)

Result

format long
>> head(T)
ans =
  8×5 table
    frame    timestamp     loc_x       loc_y      loc_z 
    _____    _________    ________    _______    _______
    1007     52045.728    -135.966    225.786    -52.285
    1008     52045.745    -135.966    225.786    -52.285
    1009     52045.761    -135.967    225.786    -52.283
    1010     52045.778    -135.967    225.786    -52.283
    1011     52045.795    -135.967    225.786    -52.283
    1012     52045.811    -135.967    225.786    -52.283
    1013     52045.828    -135.967    225.786    -52.283
    1014     52045.845    -135.967    225.786    -52.283

MATLAB: Mean of a 3D struct with 6 fields

Letting YS be Your Structure,

   fn = fieldnames(YS);
   for K = 1 : length(fn)
     fin = fn{K};
     means.(fin) = reshape(mean(vertcat(YS.(fin)),2),size(YS));
   end

This will produce a structure means with field names the same as the field names in YS, each of which is an array that is the mean of the field at the corresponding structure entry.

Best Answer

Related Solutions

MATLAB: Import data from txt file

MATLAB: Mean of a 3D struct with 6 fields

Related Question