/usr/share/octave/packages/signal-1.3.2/upsample.m is in octave-signal 1.3.2-1+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | ## Author: Paul Kienzle <pkienzle@users.sf.net> (2007)
## This program is granted to the public domain.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{y} =} upsample (@var{x}, @var{n})
## @deftypefnx {Function File} {@var{y} =} upsample (@var{x}, @var{n}, @var{offset})
## Upsample the signal, inserting @var{n}-1 zeros between every element.
##
## If @var{x} is a matrix, upsample every column.
##
## If @var{offset} is specified, control the position of the inserted sample in
## the block of @var{n} zeros.
## @seealso{decimate, downsample, interp, resample, upfirdn}
## @end deftypefn
function y = upsample (x, n, phase = 0)
if nargin<2 || nargin>3, print_usage; endif
if phase > n - 1
warning("This is incompatible with Matlab (phase = 0:n-1). See octave-forge signal package release notes for details." )
endif
[nr,nc] = size(x);
if any([nr,nc]==1),
y = zeros(n*nr*nc,1);
y(phase + 1:n:end) = x;
if nr==1, y = y.'; endif
else
y = zeros(n*nr,nc);
y(phase + 1:n:end,:) = x;
endif
endfunction
%!assert(upsample([1,3,5],2),[1,0,3,0,5,0]);
%!assert(upsample([1;3;5],2),[1;0;3;0;5;0]);
%!assert(upsample([1,2;5,6;9,10],2),[1,2;0,0;5,6;0,0;9,10;0,0]);
%!assert(upsample([2,4],2,1),[0,2,0,4]);
%!assert(upsample([3,4;7,8],2,1),[0,0;3,4;0,0;7,8]);
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