Error using fopen Unable to find file. Ensure file exists and path is valid.

Error using fopen

Unable to find file. Ensure file exists and path is valid.

The file path is valid and the file is there still unable to read it.

[Rik]

What code were you using and how did you verify Matlab has read (or write) access?

[PRAGYA ARORA]

clc;

close all;

clear all;

p1 = fopen('Mylocation.txt');

a1 = fscanf(p1,'%f\t%f\t%f\n',[3,inf]);

fclose(p1);

final1=a1';

I have checked the directory name, spelling and location sevral times. Still it doesnt open at times, the same code was working for other files in the hard-disk.

[PRAGYA ARORA]

I am facing the same issue with readmatrix/ writematrxi and even while saving the image, these commands used to work properly but somehow creating this error now. Can you suugest something? Thankyou so much.

[Rik]

You should make it a habit to specify the permission when using fopen.

As far as the directory is concerned: you don't specify it, so the current active directory is used. Was that your intention?

When creating files it doesn't matter if the named file exists, since it will be either created or overwritten.

Answer 1

[Sulaymon Eshkabilov]

One of the possible scenarious for such an error might be that your data file is residing in OneDrive (Cloud). Solution is

using addpath(' ...') to add your data file directory accessible by your matlab before recalling your data file.

[Rik]

Is that simply to force the folder to be available offline? It seems a very brute force method to achieve this.

I would suggest making a backup of the path and restoring it immediately after the addpath.

[Walter Roberson]

The only network-filesystem problem that I know of that might be relevant, would not be affected by using addpath. Sometimes such problems are temporarily rectified by unmounting and remounting the network file so that they synchronize. Other times it turns out that you have to use network time daemons to synchronize times between systems. And sometimes it is down to slow or congested networks between you and the network file system server.

[Walter Roberson]

But most of the time the problem turns out to be that you are trying to open a different file than you think you are opening. Spelling mistakes, wrong directory specified, relative directory was used but you are cd'd to somewhere else. Or from time to time you encounter problems with the file system having been created using a different character set that cannot handle one of the characters you are trying to use.

[PRAGYA ARORA]

Hi Walter,

Thankyou for your reply, I am using the below code: I am calling the data from my external hard disk.

clc;

close all;

clear all;

p1 = fopen('Mylocation.txt');

a1 = fscanf(p1,'%f\t%f\t%f\n',[3,inf]);

fclose(p1);

final1=a1';

I have checked the directory name, spelling and location sevral times. Still it doesnt open at times, the same code was working for other files in the hard-disk.