% -*- texinfo -*-
% @deftypefn {Function File} {} contour (@var{z})
% @deftypefnx {Function File} {} contour (@var{z}, @var{vn})
% @deftypefnx {Function File} {} contour (@var{x}, @var{y}, @var{z})
% @deftypefnx {Function File} {} contour (@var{x}, @var{y}, @var{z}, @var{vn})
% @deftypefnx {Function File} {} contour (@dots{}, @var{style})
% @deftypefnx {Function File} {} contour (@var{h}, @dots{})
% @deftypefnx {Function File} {[@var{c}, @var{h}] =} contour (@dots{})
% Plot level curves (contour lines) of the matrix @var{z}, using the
% contour matrix @var{c} computed by @code{contourc} from the same
% arguments; see the latter for their interpretation. The set of
% contour levels, @var{c}, is only returned if requested. For example:
%
% @example
% @group
% x = 0:2;
% y = x;
% z = x' * y;
% contour (x, y, z, 2:3)
% @end group
% @end example
%
% The style to use for the plot can be defined with a line style @var{style}
% in a similar manner to the line styles used with the @code{plot} command.
% Any markers defined by @var{style} are ignored.
%
% The optional input and output argument @var{h} allows an axis handle to
% be passed to @code{contour} and the handles to the contour objects to be
% returned.
% @seealso{contourc, patch, plot}
% @end deftypefn