Attempting to write my data into a single CSV file.

I am currently trying to record both the users keyboard response, and their reaction time associated with making each response to the image presented. I am struggling to identify a way in which I can write and save both the response and reaction time in the same CSV.file. I was wondering if anyone had any suggestions? I currently have the following code;

d=21; %Number of images to load in is 21. 
if d<1 || d>21 %A check to ensure that the correct number of images will be displayed. 
    disp('Error, the number of images loaded in out of range')
end

rts= (zeros(21, 1)); %rts is a numeric array, 21, 1, made up of zeros. 
response=(zeros(21, 1)); % response is a numeric array, 21, 1, made up of zeros. 
dirname= 'C:\Users\User\Documents\MATLAB\stimuli\'; %Location of stimuli  

count= 0;

d=dir([dirname '*.jpg']); 

for a =randperm(numel(d))% return scalar count of elements in matrix
    %And randomly present the images under the variable of d. 
    a= imread(d(a).name); %read in images in desired folder
    imshow(a) %show selected images
    pause(2); %allow a 2 second pause between successive stimuli.
    b= imread('FixationDot.jpg');% read in the fixation dot 
    imshow(b) %show the fixation dot between every letter
    pause(0.5); %allow the fixation dot to remain there for 0.5 seconds
    tic
    count= count+1;
    response(count)= getkey(); %Gain user input 
    rts(count)= toc; %Record the time taken to produce a response from user     
end
M= char(response); %convert ASCII codes to underlying char key press

csvwrite('response.csv', response); %writes user response into a CSV file
csvwrite('reaction_time.csv', rts); %writes users reaction time

Thank you to anyone that can help, I really appreciate it.

Answer 1

[Ollie A]

I would create a table, using the MATLAB function

T = table(response, reaction_time);

and then simply writing the table to a csv file:

writetable(T,'data.csv')

The benefit of using table() is that you can easily include column headers.

You might also like to include the stimuli image number in another column, i.e.

T = table(imagenumber, response, reaction_time);

[Ollie A]

If you want to go further, you can first change the getkey() output from ASCII to a character by doing

response{count} = char(getkey());

Tables can handle data of different formats as well, so it doesn't matter that the first column is a cell array and the second is an array of numbers.

[Kyle Davis]

Thank you so much!

Answer 2

[Andreas Kvalbein Fjetland]

This should do the trick

response = zeros(21,1);
rts = zeros(21,1);

% Looop

resultTable = table(response,rts);
writetable(resultTable,'fileName.csv')

Please use the code function in the editor next time. Makes your code easier to read and copy.

[Kyle Davis]

Thank you for your help, I will do next time, sorry if my code wasn't easy to understand