/usr/share/octave/packages/control-2.6.2/db2mag.m is in octave-control 2.6.2-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 | ## Copyright (C) 2009-2014 Lukas F. Reichlin
##
## This file is part of LTI Syncope.
##
## LTI Syncope 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.
##
## LTI Syncope 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 LTI Syncope. If not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{mag} =} db2mag (@var{db})
## Convert Decibels (dB) to Magnitude.
##
## @strong{Inputs}
## @table @var
## @item db
## Decibel (dB) value(s). Both real-valued scalars and matrices are accepted.
## @end table
##
## @strong{Outputs}
## @table @var
## @item mag
## Magnitude value(s).
## @end table
##
## @seealso{mag2db}
## @end deftypefn
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: November 2012
## Version: 0.1
function mag = db2mag (db)
if (nargin != 1 || ! is_real_matrix (db))
print_usage ();
endif
mag = 10.^(db./20);
endfunction
%!assert (db2mag (40), 100);
%!assert (db2mag (-20), 0.1);
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