function cr=angle2cr(angle,t,f)% angle2cr -- convert an angle in the t-f plane to a chirp rate%%  Usage%    cr = angle2cr(angle, t, f)%%  Inputs%    angle  angle (degrees)%    t      time range%    f      frequency range%%  Outputs%    cr    chirp rate% Copyright (C) -- see DiscreteTFDs/Copyrighterror(nargchk(3,3,nargin));cr = f/t*tan(angle*2*pi/360);