http://www.mathworks.com/support/solutions/en/data/1-5YQCPR/index.html?product=ML说:Bydefault,the'pathdef.m'filemaybelocatedineitherthe'$MATLABROOT/toolbox/local'directoryorthe'$USERPATH'directory,where$MATLABROOTand$USERPATHarethedirectoriesdisplayedafterenteringthecommandsmatlabroot(e.g.C:\Prog