Invalid file identifier. Use fopen to generate a valid file identifier.

[the cyclist]

What's your question?

From your screenshot, I would suggest that you have provided an invalid file identifier to the function solve_TFB, and you should generate a valid identifier using fopen.

I realize that that is not very helpful advice ... but you really haven't given us any relevant information to help more than that. Maybe read the documentation for fopen?

I don't recognize solve_TFB as a MATLAB function provided by MathWorks, and neither does Google. Where does that come from?

[Kavin Bharathi Vijayakumar]

That is a .p file (solve_TFB). I was told that I cant open it but rather use it in a function. Thats what i tried to do and got this error.

[the cyclist]

OK. Presumably the first argument should be a file id, as output by the fopen command. Your screenshot doesn't really show how you are calling the function. (It's generally better to share copy/pasted code and error messages, not screenshots.)

[Kavin Bharathi Vijayakumar]

This is the error

Error using textscan

Invalid file identifier. Use fopen to generate a valid file identifier.

Error in solve_TFB

Error in solve_TFB

Error in a01_getStressResults_done (line 21)

solve_TFB(inputFile,M_xx,M_yy)

[Kavin Bharathi Vijayakumar]

Code:

% path to input file
inputFile = [cd '\Absatz_Biegung.inp'];
% moment about x-axis
M_xx = 0;

% moment about y-axis
M_yy = 400;

%%
%%% call solver and receive the following data:
%     nodes        --> list of nodes with corresponding coordinates
%     elements     --> list of elements with corresponding node IDs
%     u            --> displacement vector
%     colorData_u  --> magnitude of displacement at nodes
%     stressTensor --> (Voigt) stress tensors extrapolated to nodes
%     colorData_s  --> von Mises stress at nodes
[nodes,elements,u,colorData_u,stressTensor] = ...
    solve_TFB(inputFile,M_xx,M_yy);

[the cyclist]

It's not clear to me what the solve_TFB file is expecting, but what you've done here does seem correct. Does

help solve_TFB

provide any information?

By default calling help on a p-file will not provide information, unless they also provided an accompanying m-file with just the help info.

[Walter Roberson]

File Absatz_Biegung.inp does not exist in the current directory, or cannot be opened.

Answer 1

[Aditya Jha]

Hi!

The problem seems to have occurred because the file does not exist or cannot be opened.Try providing the correct path to the file “Absatz_Biegung.inp”.

Even after providing the correct path to input file, if it does not work, then refer to the documentation of “fopen“ and try passing fileID for the inputFile parameter.

https://www.mathworks.com/help/matlab/ref/fopen.html

[Walter Roberson]

Oh and use fullfile() instead of concatenation of character vectors for directory and file name. The \ separator is not valid in Linux or MacOS