RAMPUP - Rising ramp function

function outsig=rampup(L,wintype)
%RAMPUP  Rising ramp function
%   Usage: outsig=rampup(L);
%
%   RAMPUP(L) will return a rising ramp function of length L. The
%   ramp is a sinusoide starting from zero and ending at one. The ramp
%   is centered such that the first element is always 0 and the last
%   element is not quite 1, such that the ramp fits with following ones.
%
%   RAMPUP(L,wintype) will use another window for ramping. This may be any
%   of the window types from FIRWIN. Please see the help on FIRWIN for
%   more information. The default is to use a piece of the Hann window.
%
%   See also: rampdown, rampsignal, firwin
%
%   Url: http://ltfat.github.io/doc/sigproc/rampup.html

% Copyright (C) 2005-2023 Peter L. Soendergaard <peter@sonderport.dk> and others.
% This file is part of LTFAT version 2.6.0
%
% This program is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program.  If not, see <http://www.gnu.org/licenses/>.

complainif_argnonotinrange(nargin,1,2,mfilename);

if nargin==1
  wintype='hann';
end;
  
win=firwin(wintype,2*L,'inf');
outsig=win(L+1:2*L);