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import an easy file

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Erik Verdijk
Erik Verdijk 2018 年 3 月 29 日
コメント済み: Elias Gule 2018 年 3 月 29 日
I know it is a easy question, but I should be extremely grateful if someone give me and answer. I have a string with a complete path. How do I Import this textfile? I know it is stupid, but i shoud thank you 1000 times if you cam help me. I get the message unable to import file.

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Rik
Rik 2018 年 3 月 29 日
What code are you using to import the file? Because the error text is not a usual error message.
Erik Verdijk
Erik Verdijk 2018 年 3 月 29 日
clear all;
close all;
[FileName,PathName] = uigetfile('../*.csv','MultiSelect','off','title','path');
fileID = fopen(FileName);
C = textscan(fileID,'%d%d%d%s%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d','HeaderLines',80,'Delimiter','/t');
fclose(fileID);
Erik Verdijk
Erik Verdijk 2018 年 3 月 29 日
and I get an empty matrix

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Elias Gule
Elias Gule 2018 年 3 月 29 日
In this code:
[FileName,PathName] = uigetfile('../*.csv','MultiSelect','off','title','path');
FileName is simply the name of the file you selected. So if the file is not located in the present working directory, fopen will not be able to read it. So it will return an fid of -1, which is an invalid file 'pointer'.
What you need is to supply the full path of the file to fopen. So doing this:
fid = fopen(fullfile(PathName,FileName));
will return a valid file 'pointer'.

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Erik Verdijk
Erik Verdijk 2018 年 3 月 29 日
clear all; close all; answer = 4;
while answer > 1 [FileName,PathName] = uigetfile('../*.txt','MultiSelect','off','title','path'); fid = fopen(fullfile(PathName,FileName)); fileID = fopen(fid); C = textscan(fileID,'%d%d%d%s%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d','HeaderLines',80,'Delimiter','tab'); fclose(fileID); answer = questdlg('Do you want to select an other file?', ... 'Options', ... 'Yes','No','No'); switch answer case 'Yes' answer = 4; case 'No' answer = 1; end while answer > 3 [FileName,PathName] = uigetfile('../*.txt','MultiSelect','off','title','path'); fileID = fopen(FileName); C = textscan(fileID,'%d%d%d%s%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d','HeaderLines',80,'Delimiter','tab'); fclose(fileID); answer = questdlg('Do you want to select an other file?', ... 'Options', ... 'Yes','No','No'); switch answer case 'Yes' answer = 4; case 'No' answer = 1; end end end
Elias Gule
Elias Gule 2018 年 3 月 29 日
You made a little error.
fid = fopen(fullfile(PathName,FileName)); fileID = fopen(fid);
Is the one that causes the problem.
What you referred to as fileID, is actually what I referred to as fid. So change this line to:
fileID = fopen(fullfile(PathName,FileName));
Elias Gule
Elias Gule 2018 年 3 月 29 日
Please change your delimiter option from "tab" to "\t".

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