legendtitle

LEGENDTITLE adds a title to a legend
 LEGENDTITLE(LEGH,TITLESTR) adds the title TITLESTR to the legend LEGH
 LEGENDTITLE(TITLESTR) adds the title to the current legend in the current
  axes.
 LEGENDTITLE(...,Param1,Val1,Param2,Val2,...) sets the specified
  properties for the text object.
 H = LEGENDTITLE(...) returns the handle for the text object used to
  create the title string
 legendtitle('reza')