Errorhandling with Readmatrix trying to read data from a file

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Dennis G 2022-7-27

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https://ww2.mathworks.cn/matlabcentral/answers/1769095-errorhandling-with-readmatrix-trying-to-read-data-from-a-file

回答： Rishav 2023-9-7

I am using the "readmatrix" function in a matlab function in simulink to repeatedly read data out of a file called output.dat.

This works, but sometimes another Software is accessing the file for a quick moment so im getting a error message that states that permission to open the file is denied.

Is it possible to handle errors by editing the try catch part in the "readmatrix.m" directly? I want the function to try to access the file and in case it is not accessible then it should try again until it is accessable. How can i implement this best?

Thanks in advance.

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Dennis G 2023-8-17

Hello Damien,

yes i solved the issue. I did errorhandling differently: First i made sure that the file i want to read in is actually not occupied by the other software. This i did by using "fopen":

open=fopen('output.dat', 'r');

If open is -1 then it is occupied and i will just try again (loop) until the value is not -1 anymore.

Another thing i did was checking open for "integrity", so i checked if it contains the array i expect in the expected format (for example with "if open =~ isequal(size(output), [6 2])...).

This helped.

Damien Pecher 2023-8-17