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How to continue for loop if file not found?

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jschen1
jschen1 am 31 Okt. 2020
Kommentiert: jschen1 am 1 Nov. 2020
Hi all,
I'm trying to sort through subfolders on a remote server (i.e there is a folder for each year, and within each year is 12 months, each in their own folder, and then each monthly folder has a file for each day and I am looking at those daily files). So I created some code to sort through each file, but the issue is that there is no files for two of the months. How can I tell the code to skip those years? Here is my code:
path = '/' %just the path to the directory
finaldata = NaN(37,365);
for year = 1979:2015
for month = 1:12
string_year = string(iyear);
string_month = sprintf('%02d',imonth);
filepath = path + string_year + '/' + string_month + '/';
folders = dir(file_path +'*.nc');
filename = folders.name;
files = filepath + filename;
if ~isfile(files)
continue;
end
for day = 1:length(files)
%some code on data processing
%x is output of data, which is a single number for each file and then that is put in the empty array
finaldata(month,day) = x;
end
end
end
Here is the section in question:
if ~isfile(files)
continue;
end
I keep getting an error that says "Insufficent number of outputs from the right hand sign of equal sign to satisfy argument" in reference to the line "filename = folders.name", so I don't think it is working. Thank you!
  1 Kommentar
jschen1
jschen1 am 31 Okt. 2020
I also am worried I have it in the wrong location, so any insight on that would really help!

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Akzeptierte Antwort

Adam Danz
Adam Danz am 31 Okt. 2020
Bearbeitet: Adam Danz am 31 Okt. 2020
First, "file_path" should be filepath to match the pre-defined variable name 3 lines above.
Second, if the filepath does not exist, folders will be empty,
folders = dir(filepath +'*.nc');
so a better test would be,
folders = dir(file_path +'*.nc');
if ~isempty(folders) % <---test
filename = folders.name;
files = filepath + filename;
for day = 1:numel(files) % <--- use numel instead of length
% [ STUFF ]
end
end
Make sure you're preallocating any loop variables in case iterations are skipped!

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