% -*- texinfo -*-
% @deftypefn {Function File} {} errorbar (@var{args})
% This function produces two-dimensional plots with errorbars. Many
% different combinations of arguments are possible. The simplest form is
%
% @example
% errorbar (@var{y}, @var{ey})
% @end example
%
% @noindent
% where the first argument is taken as the set of @var{y} coordinates
% and the second argument @var{ey} is taken as the errors of the
% @var{y} values. @var{x} coordinates are taken to be the indices
% of the elements, starting with 1.
%
% If more than two arguments are given, they are interpreted as
%
% @example
% errorbar (@var{x}, @var{y}, ..., @var{fmt} ...)
% @end example
%
% @noindent
% where after @var{x} and @var{y} there can be up to four error
% parameters such as @var{ey}, @var{ex}, @var{ly}, @var{uy} etc.,
% depending on the plot type. Any number of argument sets may appear,
% as long as they are separated with a format string @var{fmt}.
%
% If @var{y} is a matrix, @var{x} and error parameters must also be matrices
% having same dimensions. The columns of @var{y} are plotted versus the
% corresponding columns of @var{x} and errorbars are drawn from
% the corresponding columns of error parameters.
%
% If @var{fmt} is missing, yerrorbars ('~') plot style
% is assumed.
% If the @var{fmt} argument is supplied, it is interpreted as in
% normal plots (See __pltopt__). In addition the following
% plot styles are supported by errorbar:
%
% @table @samp
% @item ~
% Set yerrorbars plot style (default).
%
% @item >
% Set xerrorbars plot style.
%
% @item ~>
% Set xyerrorbars plot style.
%
% @end table
%
% Examples:
%
% @example
% errorbar(@var{x}, @var{y}, @var{ex}, '>')
% @end example
%
% xerrorbar plot of @var{y} versus @var{x} with @var{x} errorbars drawn from
% @var{x}-@var{ex} to @var{x}+@var{ex}.
%
% @example
% errorbar(@var{x}, @var{y1}, @var{ey}, '~', @var{x}, @var{y2}, @var{ly}, @var{uy})
% @end example
%
% Two yerrorbar plots with @var{y1} and @var{y2} versus @var{x}.
% Errorbars for @var{y1} are drawn from @var{y1}-@var{ey} to
% @var{y1}+@var{ey}, errorbars for @var{y2} from @var{y2}-@var{ly} to
% @var{y2}+@var{uy}.
%
% @example
% errorbar(@var{x}, @var{y}, @var{lx}, @var{ux}, @var{ly}, @var{uy}, '~>')
% @end example
%
% xyerrorbar plot of @var{y} versus @var{x} where @var{x} errorbars
% are drawn from @var{x}-@var{lx} to @var{x}+@var{ux} and @var{y} errorbars
% from @var{y}-@var{ly} to @var{y}+@var{uy}.
%
% @end deftypefn
% @seealso{semilogx, semilogy, loglog, polar, mesh, contour, __pltopt__,
% bar, stairs, __gnuplot_plot__, __gnuplot_splot__, replot, xlabel, ylabel, and title}