how to check the input is a valid text file name in matlab

To check if the input is a valid text file name in Matlab, you can use the exist function to check if the file exists. Here's an example:

main.m
filename = input('Enter a text file name: ', 's');
if exist(filename, 'file') == 2
    disp('Valid text file name');
else
    disp('Invalid text file name');
end
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In this example, the input function is used to prompt the user for a text file name. The %s format specifier is used to tell input to treat the input as a string.

The exist function is then used to check if the text file exists. If the file exists, exist will return 2. If the file does not exist, exist will return 0.

If exist returns 2, the text "Valid text file name" is displayed. Otherwise, the text "Invalid text file name" is displayed.