i want to create an error msg in matlab gui

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..

[partha das]

plz tell me the condition for the error msg.

Answer 1

[Friedrich]

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

[partha das]

thank you.. very much sir...

Answer 2

[Chirag Gupta]

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')

[partha das]

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]

it is not cell type array.. its a simple matrix.

[Friedrich]

I repeat again: If the Excel file is not on the MATLAB path you will need the absolut path to it.

[partha das]

excel file is in the matlab path.... till not working.

[Friedrich]

it works fine for me. please post your code and the content of the variable a

[partha das]

thank you.. very much sir..