Mangesh - rather than using the input function, consider uigetfile instead. It is easier to get the user to choose the file using a GUI rather than trying to type in the path and name. For example, your above code could be rewritten as
% choose a file and define the extensions (more can be added in a similar fashion)
[filename, pathname] = uigetfile({'*.jpg;*.bmp;*.gif'},'Image File Chooser');
% if the cancel button is pressed, then filename is numeric (0)
if ischar(filename)
% we have a file name, so create the full path and file name string
pathToFile = fullfile(pathname, filename);
b = importdata(pathToFile);
end
Try the above and see what happens!
