Why am I getting invalid file identifier error?

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Kelsey Ward
Kelsey Ward 2022-11-25
回答： Raymond Norris 2022-11-25
This section of code that I am running keeps giving me the error "Invalid file identifier. Use fopen to generate a valid file identifier" when it gets to the parfor loop. I cannot figure out what would be causing the issue. Where is my file identifier invalid?
if loc1(1)>loc2(1)
disp('start from flood tide')
name = {'/home/kward/model/particles/flood/particles_','/home/kward/model/particles/ebb/particles_'};
else
disp('start from ebb tide')
name = {'/home/kward/model/particles/ebb/particles_','/home/kward/model/particles/flood/particles_'};
end
loc= unique([loc1,loc2]);
t_r = (t(loc(1:end-1))+t(loc(2:end)))/2;
name1 = name{1};
name2 = name{2};
parfor i=1:length(t_r)
if mod(i,2) == 1
OF = [name1,num2str((i+1)/2,'%02d'),'.dat'];
else
OF = [name2,num2str(i/2,'%02d'),'.dat'];
end
fprintf('Saving %s\n',OF)
if (exist(OF, 'file')==2)
delete(OF);
end
fid = fopen(OF,'wt');
fprintf(fid, [num2str(length(lon)*num),' 2\n']);
fprintf(fid, 'testing\n');
fprintf(fid, 'vertical coordinate = zx y z t_release\n');
fclose(fid);
tsi = [lon,lat,lat,lat]; % longtitude&latitude
tsi(:,3) = 0; % depth
tsi(:,4)=t_r(i);%time
tsi = repmat(tsi,num,1);
disp('Writing data...');
dlmwrite(OF, tsi, 'delimiter', ' ', '-append','precision','%.4f');
end

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回答（2 个）

Sulaymon Eshkabilov
Sulaymon Eshkabilov 2022-11-25
Hi,
I would check the directory address is correct. And if it is correct, then if MATLAB is reading it correctly.
name = {'/home/kward/model/particles/flood/particles_','/home/kward/model/particles/ebb/particles_'};
Raymond Norris
Raymond Norris 2022-11-25
fopen will return two output arguments: the file id and an error message if it failed (i.e., the file id is <0). Add the following for additional diagnostics
[fid, emsg] = fopen(OF,'wt');
if fid<0
error(emsg)
end

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