% Set the signal axis (i.e. intensity) to the values for the named argument
%
%   >> wout=signal(w,param_name)    %
%
%   e.g. >> wout=signal(w,'h')  % set to component along a*
%
%   Valid parameter names are:
%               'd1','d2',...       Display axes (for as many dimensions as sqw object has)
%               'h', 'k', 'l'       r.l.u.
%               'E'                 energy transfer
%               'Q'                 |Q|
%%   Overloaded methods:
%      sqw/signal
%      sqw/signal
%