How can I change in the directory while using dlmwrite?

Hi

I have a problem, I use dlmwrite to write data in a excel file, but when I run the code, I have noticed that the directory in which lake_para_file is addressed does not exist at al.

lake_par_file = tempname;
fid=fopen(lake_par_file,'wt');
fprintf(fid,'\n\n');
dlmwrite(lake_par_file, [[1:length(K_lake)]',data_lake{2},data_lake{3},data_lake{4},(1:length(K_lake))'],'delimiter','\t','-append'); % 1:length(K_lake) is the length of the parameter file.
fclose(fid);

Does anybody know how can I change the directory?

[Walter Roberson]

until you fclose the fid it might not flush the buffer.

[Walter Roberson]

I am not clear on what you mean about the directory. Are you saying that if you

td = fileparts(lake_par_file)
isfolder(td)

will say false (0)?

[Sahar khalili]

no it says true. But I cannot find such directory that it is addressed in the workspace.

Answer 1

[Jan]

I do not understand, what the problem is. The function tempname creates a file in your TEMP folder. Under Windows this is: C:\Users\<YourAccount>\AppData\Local\Temp\ . The file name is chosen randomly, e.g. 'tp3ed79371_4d80_4861_aa70_9b2bf68b293c' without a file extension.

What does "addressed in the workspace" mean?

Why do you open the file in addition by:

fid=fopen(lake_par_file,'wt');

"Does anybody know how can I change the directory?" - which one? The cd command changes the current directory, but this is a fragile method to determine the output folder. Prefer to use an absolute file name instead, e.g.

Folder = cd;  % Or 'C:\Temp' or which folder you prefer
File   = 'myData.csv';
dlmwrite(fullfile(Folder, File), ...
    [(1:length(K_lake)).', data_lake{2:4, (1:length(K_lake)).'], ...
    'delimiter', '\t', '-append');