Append to Text File with For Loop

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Allen Hammack
Allen Hammack on 17 Jun 2022
Commented: Image Analyst on 19 Jun 2022
I am trying to append to a text file using a for loop. Here is a generalized version of my script:
for 1:length(variable)
if isempty(dir(file_name)) == 1
fid = fopen(strcat(pwd,'\',file_name),'w');
fprintf(fid,strcat(repmat('%s\t',1,5),'\n'),...
'Daily Directory',...
'Test Directory',...
'Data File',...
'Position',...
'Maximum');
fclose(fid);
else
end
fid = fopen(strcat(pwd,'\',file_name),'a');
fprintf(fid,strcat(repmat('%s\t',1,5),'\n'),...
daily_directory,...
test_directory,...
file,...
position_id,...
vel_max);
fclose(fid);
end
When I run my script, second fprintf statement appears to overwrite the text that was produced in the previous step through this for loop. For the line
fid = fopen(strcat(pwd,'\',file_name),'a');
I have tried these options: 'a', 'at', and 'a+', but the text continues to be overwritten. Can someone please tell me how to fix my code, such that the text in my text file is appended to instead of being overwritten?
Thanks!
  5 Comments
Image Analyst
Image Analyst on 19 Jun 2022
@Voss can make an answer with the same solution below. Then it could be accepted.

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