function [fighandle]=gdat_plot(gdat_data,varargin);
%
% choices from doplot in gdat_data.gdat_params.doplot:
%     doplot = 0: no plot
%            = 1: new figure created
%            = -1: add to current figure (with hold all)
%            > 1: create new figure with this number, adding clf
%            <-1: add to figure number abs(doplot) (with hold all)
%
if ~isfield(gdat_data.gdat_params,'doplot') || gdat_data.gdat_params.doplot ==0
  return
end

if prod(isfield(gdat_data,{'data','t'})) && ~isempty(gdat_data.data) && ~isempty(gdat_data.t)
  fighandle = get(0,'CurrentFigure');
  if gdat_data.gdat_params.doplot == 1
    fighandle = figure;
  elseif gdat_data.gdat_params.doplot > 1
    fighandle = figure(gdat_data.gdat_params.doplot);
    clf;
  elseif gdat_data.gdat_params.doplot == -1
    hold all
  elseif gdat_data.gdat_params.doplot < -1
    fighandle = figure(abs(gdat_data.gdat_params.doplot));
    hold all
  end
  if strcmp(gdat_data.gdat_request,'eqdsk')
    % special case, plot contours of first equil
    endstr = '';
    if iscell(gdat_data.eqdsk); endstr = '{1}'; end
    eval(['contour(gdat_data.eqdsk' endstr '.rmesh,gdat_data.eqdsk' endstr '.zmesh,gdat_data.eqdsk' endstr '.psi'',100);'])
    hold on
    eval(['plot(gdat_data.eqdsk' endstr '.rplas,gdat_data.eqdsk' endstr '.zplas,''k'');'])
    eval(['plot(gdat_data.eqdsk' endstr '.rlim,gdat_data.eqdsk' endstr '.zlim,''k'');'])
    axis equal;
    title(eval(['gdat_data.eqdsk' endstr '.stitle']));
  elseif any(find(size(gdat_data.data)==length(gdat_data.t)))
    plot(gdat_data.t,gdat_data.data);
    title([gdat_data.gdat_params.machine ' #' num2str(gdat_data.shot)]);
    if isfield(gdat_data,'mapping_for')
      xlabel(['time [' gdat_data.dimunits{gdat_data.mapping_for.(gdat_data.gdat_params.machine).gdat_timedim} ']']);
    else
      xlabel(['time']);
    end
    ylabel_eff = gdat_data.label;
    if iscell(gdat_data.label) && length(gdat_data.label)>=2; ylabel_eff = gdat_data.label{2}; end
    if ~isempty(gdat_data.units)
      ylabel([ylabel_eff '[' gdat_data.units ']']);
    else
      ylabel(ylabel_eff);
    end
    zoom on;
  end
else
  disp('cannot plot gdat_data, has empty data or t field')
end