pass a struct through a loop to extract data and have the i in the loop added to the name

The objective is at the bottom of this code, and it is to run a loop over structs, to read each one, apply an if statement and then to update the accuracy totals like a counter. The goal is the to open the accuracy struct, and see a column of accuracies with the total number of correct. The issue lies in the last nested for loop, where i want the i to be added to the struct cell name. For example, in the first iteration, accuracy_total_i would be accuracy_total_1. How do i add the i to the name?

clc; clear; close all

path = 'some_path';
accuracy_files = dir(fullfile(path, 'accuracy*'));
pred_files = dir(fullfile(path, 'pred*'));

for i = 1:length(accuracy_files)
    temp = strcat('accuracy_', num2str(i));
    accuracy.(temp) = readtable(fullfile(path, accuracy_files(i).name));
end

for i = 1:length(pred_files)
    temp = strcat('pred_', num2str(i));
    predictions.(temp) = readtable(fullfile(path, pred_files(i).name));
end

scores = readtable('other_path');

n_known = scores.known(1);
n_unknown = scores.unknown(1);
N = n_known + n_unknown;

times = scores.time_elapsed;

for i = 1:length(pred_files)
    temp = strcat('accuracy_total_', num2str(i));
    accuracy_totals.(temp) = 0;
end

for i = 1:length(pred_files)
    for j = 1:length(n_unknown)
        if predictions(1).pred_i.y_pred(j) == predictions(1).y_all(j)
            accuracy_totals(1).accuracy_total_i = accuracy_totals(1).accuracy_total_i +1
        end
    end
end

Answer 1

[Jan]

The best idea is to use an index as index:

accuracy_totals(1).accuracy_total(i)

Arrays are smarter than a pile of fields with an index hidden in the name.

Less efiicient, but working: "dynamic field names":

accuracy_totals(1).(sprintf('accuracy_total_%d', i))

[Anthony Sirico]

Thanks!

Answer 2

[Sulaymon Eshkabilov]

Here is one of the viable codes to read series of data and store in a structure array:

path = 'C:\...'   % Specify the path
for ii=1:100      % How many data file to be imported 
   textFileName = ['accuracy' num2str(ii) '.csv'];      % accuracy1.csv, accuracy2.csv, ...
   %    textFileName = ['accuracy' num2str(ii) '.txt']; % accuracy1.txt, accuracy2.txt, ...
   %    textFileName = ['accuracy' num2str(ii) '.dat'];
   %    textFileName = ['accuracy' num2str(ii) '.xlsx'];
	if isfile(textFileName)
		temp = strcat('accuracy_', num2str(ii));
        accuracy.(temp) = readtable(fullfile(path, textFileName));  % Stores the read data in a structure called: accuracy
	else
		fprintf('File %s does not exist.\n', textFileName);
    end
end