How can a function find location of itself?

I want to save a file in the same location as the a function (ie not in the current folder). How can a function find get the location of itself?

(the file should handle being moved around, additionally, it will always be in some PATH)

Answer 1

[Walter Roberson]

http://www.mathworks.com/help/matlab/ref/mfilename.html

together with fileparts() to extract the directory portion, and fullfile() to construct the new file name.