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function [y,bw] = audspace(fmin,fmax,n,varargin)
%-*- texinfo -*-
%@deftypefn {Function} audspace
%@verbatim
%AUDSPACE Equidistantly spaced points on auditory scale
% Usage: y=audspace(fmin,fmax,n,scale);
%
% AUDSPACE(fmin,fmax,n,scale) computes a vector of length n*
% containing values equidistantly scaled on the selected auditory scale
% between the frequencies fmin and fmax. All frequencies are
% specified in Hz.
%
% See the help on FREQTOAUD to get a list of the supported values of the
% scale parameter.
%
% [y,bw]=AUDSPACE(...) does the same but outputs the bandwidth between
% each sample measured on the selected scale.
%
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/auditory/audspace.html}
%@seealso{freqtoaud, audspacebw, audfiltbw}
%@end deftypefn
% Copyright (C) 2005-2016 Peter L. Soendergaard <peter@sonderport.dk>.
% This file is part of LTFAT version 2.3.1
%
% 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/>.
% AUTHOR : Peter L. Soendergaard
%% ------ Checking of input parameters ---------
if nargin<3
error('%s: Too few input parameters.',upper(mfilename));
end;
% Default parameters.
if ~isnumeric(fmin) || ~isscalar(fmin)
error('%s: fmin must be a scalar.',upper(mfilename));
end;
if ~isnumeric(fmax) || ~isscalar(fmax)
error('%s: fmax must be a scalar.',upper(mfilename));
end;
if ~isnumeric(n) || ~isscalar(n) || n<=0 || fix(n)~=n
error('%s: n must be a positive, integer scalar.',upper(mfilename));
end;
if fmin>fmax
error('%s: fmin must be less than or equal to fmax.',upper(mfilename));
end;
definput.import={'freqtoaud'};
[flags,kv]=ltfatarghelper({},definput,varargin);
%% ------ Computation --------------------------
audlimits = freqtoaud([fmin,fmax],flags.audscale);
y = audtofreq(linspace(audlimits(1),audlimits(2),n),flags.audscale);
bw=(audlimits(2)-audlimits(1))/(n-1);
% Set the endpoints to be exactly what the user specified, instead of the
% calculated values
y(1)=fmin;
y(end)=fmax;
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