Clear Filters
Clear Filters

"Error using fscanf"

6 views (last 30 days)
pizzaa on 19 May 2023
Commented: pizzaa on 19 May 2023
i got error which saying "Invalid file identifier. Use fopen to generate a valid file identifier"
This is the code:
function [z] = Stereo( directory, imagename, numImages)
% ***********************************************************************
% Read the lights and directions:
% ***********************************************************************
lightfile = strcat( directory, '/', 'lights2.txt')
fid = fopen(lightfile, 'r');
numLights = 1;
numLights = fscanf(fid, '%d \n', [1]);
LightMatrix = [];
for i = 1:numLights
lightDir = fscanf(fid, '%f %f %f \n', [3]);
lightDir = lightDir/norm(lightDir);
lightMatrix(i,:) = lightDir;
this is the lights2.txt file
Can someone help me i m so curious about this. Bigh thanks for your help
  1 Comment
Stephen23 on 19 May 2023
Edited: Stephen23 on 19 May 2023
Replace this command
strcat( directory, '/', 'lights2.txt')
fullfile( directory, 'lights2.txt')
And forget about using FOPEN & FSCANF: just use READMATRIX to import that file data:
If you use FOPEN then always always always remember to FCLOSE afterwards!

Sign in to comment.

Accepted Answer

Askic V
Askic V on 19 May 2023
Edited: Askic V on 19 May 2023
You're getting this error because the path to your file is not correct.
this is where the problem is:
lightfile = strcat( directory, '/', 'lights2.txt')
Print/Display this variable to see the path to the file.
BTW, if your file is structured like in the posted image, I suggest to use readmatrix function instead of fopen and fscanf.
pizzaa on 19 May 2023
can u help me with the code in using readmatrix
pizzaa on 19 May 2023
Nice ty so much

Sign in to comment.

More Answers (0)


Find more on Get Started with MATLAB in Help Center and File Exchange




Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!