I am trying to have a user input a part of a file name which will open the whole file.

Question

Jake 2023-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/2035014-i-am-trying-to-have-a-user-input-a-part-of-a-file-name-which-will-open-the-whole-file

移动：Walter Roberson 2023-10-18

e.g. the file name is Track P56.csv and i want to just be able to type in 56 when prompted to input a Track number.

This is how it is done currently however i have to type 'Track P56.csv' instead of just the number 56. Thank you in advance.

%User Input for Track Number
  tracknum = input("Track file name, Format: ('Track P__.csv'): ");
  
  %Opening the File  
  fid = fopen(tracknum,"r");

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Answer 1

Walter Roberson 2023-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/2035014-i-am-trying-to-have-a-user-input-a-part-of-a-file-name-which-will-open-the-whole-file#answer_1335224

在 MATLAB Online 中打开

trackfile = "Track P" + tracknum + ".csv";
[fid, msg] = fopen(trackfile, "r");
if fid < 0
    error('Could not open file "%s" because "%s"', trackfile, msg);
end

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Jake 2023-10-18

移动：Walter Roberson 2023-10-18

Thank you

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Answer 2

Image Analyst 2023-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/2035014-i-am-trying-to-have-a-user-input-a-part-of-a-file-name-which-will-open-the-whole-file#answer_1335214

在 MATLAB Online 中打开

Try this:

tracknum = input("Track file name, Format: ('Track P__.csv'): ");
folder = pwd; % Wherever you want.
fullFileName = fullfile(folder, sprintf('Track P%d.csv', tracknum));
%fid = fopen(fullFileName,"rt");
if isfile(fullFileName)
    % File exists so read in the data.
    data = readmatrix(fullFileName) % Read in the CSV file.
else
    % File does not exist.  Alert the user.
    errorMessage = sprintf('File not found: "%s"', fullFileName)
    uiwait(errordlg(errorMessage));
    return;
end