error in using fscanf

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Skydriver
Skydriver 2019-4-21
回答： Harshavardhan 2025-1-31
I have a script like this:
%Inputing POE
file_01='POE_0.01.txt';
fid=fopen(file_01, 'r');
FileName_01=fscanf(fid,'%g %g %g', [3,Inf])';
Mag_01=FileName_01(:,1); % moment magnitude
Dist_01=FileName_01(:,2); % distance
POE_01=FileName_01(:,3); % probability of exceedance
I = (mod(1:length(Mag_01),30)==1);
Mag = Mag_01(I);
Dist = Dist_01(1:30);
POE_01 = reshape(POE_01,30,15);
marginal(1:15,1) = sum(POE_01);
file_POE = ['POE_0.5.txt','POE_0.2.txt','POE_0.1.txt','POE_0.05.txt', ...
'POE_0.02.txt','POE_0.01.txt','POE_0.005.txt'];
for i = 1:7
file_temp=file_POE(i);
fid=fopen(file_temp, 'r');
FileName_temp=fscanf(fid,'%2.2f %g %g', [3,Inf])';
POE=FileName_temp(:,3); % probability of exceedance
marginal(1:15,i)=sum(reshape(POE,30,15));
temp=sum(marginal);
hold on
plot(Mag,marginal(1:15,i)/temp(i),'DisplayName',file_POE(i))
xlabel('Magnitude (Mw)');
ylabel('Contribution to the Hazard');
end
xlim([4.5 8.8])
legend
I got a massage about :
Error using fscanf
Invalid file identifier. Use fopen to generate a valid file identifier.
Error in inputing_data (line 73)
FileName_temp=fscanf(fid,'%g %g %g', [3,Inf
Is there any one can help?

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回答（1 个）

Harshavardhan
Harshavardhan 2025-1-31
Hi @Skydriver
The script is probably failing because the file identifier “fid” is invalid. This happens when “fopen” is unable to find the file with the file name provided.
To solve this issue, ensure that file names are accurate and exist in the current folder or folder on the MATLAB path. If they aren’t in the current folder or folder on the MATLAB path, the full paths of the files must be provided.
For more information you can check out the documentation of “fopen” - https://www.mathworks.com/help/matlab/ref/fopen.html
Moreover, you can refer to this similar question - i had an error in my program with the fscanf i can't understand why it does not work?? thank you in advance - MATLAB Answers - MATLAB Central
Hope this helps.

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