i want to create an error msg in matlab gui

2011 7 13
2 个回答
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I want to run a program where a excel file will be taken as input and i want that if the excel file is not find there should be an error msg. how can i create that type of error msg box. here file name is stored in a variable named a. please help me. thank you in advance..

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Friedrich
Friedrich 2011-7-13

0 个投票

Hi,
You have to use the exist function. If the Excel file is not on the MATLAB path you will need the absolut path to it. And than do
if exist(a,'file') ~= 2
msgbox('File Not found','Error','Error');
else
%file is there, do something with it
end
Where a should look like
a = 'C:\folder_with_file\name_of_file.xls'
a =
C:\folder_with_file\name_of_file.xls

更多回答（1 个）

Chirag Gupta
Chirag Gupta 2011-7-13

0 个投票

The previous answer seems to work. What are the contents of the variable? Is the variable a cell?
filename = 'MyTest1.xls'
if (~exist(filename,'file'))
msgbox('File Not Found','Error','Error');
end
What is the error if any that you are getting? Note that if the variable filename is a cell, you will need to pass the name explicitly like:
exist(filename{1},'file')

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partha das
partha das 2011-7-13
actually i stored the file name in a. now when i give the commend if (~exist(a,'file'))
msgbox('File Not Found','Error','Error');
end. when file is present then it also giving the error msg.. plz help.
partha das
partha das 2011-7-13
it is not cell type array.. its a simple matrix.
Friedrich
Friedrich 2011-7-13
I repeat again: If the Excel file is not on the MATLAB path you will need the absolut path to it.
partha das
partha das 2011-7-13
excel file is in the matlab path.... till not working.
Friedrich
Friedrich 2011-7-13
it works fine for me. please post your code and the content of the variable a
partha das
partha das 2011-7-13
thank you.. very much sir..

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