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## Copyright (C) 2000-2021 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
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## -*- texinfo -*-
## @deftypefn  {} {} semilogyerr (@var{y}, @var{ey})
## @deftypefnx {} {} semilogyerr (@var{y}, @dots{}, @var{fmt})
## @deftypefnx {} {} semilogyerr (@var{x}, @var{y}, @var{ey})
## @deftypefnx {} {} semilogyerr (@var{x}, @var{y}, @var{err}, @var{fmt})
## @deftypefnx {} {} semilogyerr (@var{x}, @var{y}, @var{lerr}, @var{uerr}, @var{fmt})
## @deftypefnx {} {} semilogyerr (@var{x}, @var{y}, @var{ex}, @var{ey}, @var{fmt})
## @deftypefnx {} {} semilogyerr (@var{x}, @var{y}, @var{lx}, @var{ux}, @var{ly}, @var{uy}, @var{fmt})
## @deftypefnx {} {} semilogyerr (@var{x1}, @var{y1}, @dots{}, @var{fmt}, @var{xn}, @var{yn}, @dots{})
## @deftypefnx {} {} semilogyerr (@var{hax}, @dots{})
## @deftypefnx {} {@var{h} =} semilogyerr (@dots{})
## Produce 2-D plots using a logarithmic scale for the y-axis and errorbars
## at each data point.
##
## Many different combinations of arguments are possible.  The most common
## form is
##
## @example
## semilogyerr (@var{x}, @var{y}, @var{ey}, @var{fmt})
## @end example
##
## @noindent
## which produces a semi-logarithmic plot of @var{y} versus @var{x}
## with errors in the @var{y}-scale defined by @var{ey} and the plot
## format defined by @var{fmt}.  @xref{XREFerrorbar,,@code{errorbar}}, for
## available formats and additional information.
##
## If the first argument @var{hax} is an axes handle, then plot into this axes,
## rather than the current axes returned by @code{gca}.
##
## @seealso{errorbar, semilogxerr, loglogerr}
## @end deftypefn

function h = semilogyerr (varargin)

  [hax, varargin] = __plt_get_axis_arg__ ("semilogyerr", varargin{:});

  oldfig = [];
  if (! isempty (hax))
    oldfig = get (0, "currentfigure");
  endif
  unwind_protect
    hax = newplot (hax);

    set (hax, "yscale", "log");
    if (! ishold ())
      set (hax, "yminortick", "on");
    endif

    htmp = __errplot__ ("semilogyerr", hax, varargin{:});

  unwind_protect_cleanup
    if (! isempty (oldfig))
      set (0, "currentfigure", oldfig);
    endif
  end_unwind_protect

  if (nargout > 0)
    h = htmp;
  endif

endfunction


%!demo
%! clf;
%! x = 0.25:0.25:10;
%! wblpdf = @(x, scl, shp) shp*(scl^-shp) .* x.^(shp-1) .* exp (-(x/scl).^shp);
%! y = wblpdf (x, 4, 2);
%! eyu = rand (size (y));
%! eyl = 1.0 - 1./(1+eyu);
%! semilogyerr (x, y, eyl.*y, eyu.*y, "~-d");
%! xlim ([0 10]);
%! title ({"semilogyerr(): semilogy() plot with errorbars", ...
%!         "Y-axis is logarithmic"});