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file reading problem with switch

2 次查看（过去 30 天）
Vasiliki Thomopoulou
评论： Stephen23 2021-1-4
Hey guys, I am posting this here hopping someone can help. I run the code and the thing is that even though I select an csv file the function doesnt read it, and it goes straight to displaying the error message. Does anyone have an idea why this happens? Thanks a lot in advance!!
function a=diavaseto
[fn, pn] = uigetfile({'*.csv'; '*.ods'; '*.xlsx'}, 'Epilogh arxeioy dedomenwn');
fullpathname=fullfile(pn, fn);
extIndices= strfind('.',fn);
fext = fn(max(extIndices):length(fn));
switch lower(fext)
case '.csv'
a=readtable(fullpathname);
% A csv file
case '.ods'
a=xlsread(fullpathname);
% An ods file
case 'xlsx'
a=xlsread(fullpathname);
%An xlsx file
otherwise
error('Unexpected file extension: %s', fext);
end
  1 个评论
Stephen23
Stephen23 2021-1-4
Note that some of your switch cases include the period character, but some do not.

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回答（1 个）

Cris LaPierre
Cris LaPierre 2021-1-4
编辑：Cris LaPierre 2021-1-4
My suggestion is to use fileparts rather than trying to come up with your own way to extract the file extension.
If you want to use strfind, make sure you put the inputs in the correct order. You have them reversed. It should be
extIndices= strfind(fn,'.');
  2 个评论
Vasiliki Thomopoulou
Vasiliki Thomopoulou 2021-1-4
I tried but this is the error that comes up when I try to use the fileparts function.
[filepath,name,ext] = fileparts(fullpathname);
Undefined function or variable 'fExt'.
Error in fileparts (line 2)
switch lower(fExt)
Stephen23
Stephen23 2021-1-4
[~,~,fExt] = fileparts(fullpathname);
% ^^^^^ use the correct variable name here

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