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//This function buffers the given data into a matrix of signal frames
//Calling Sequence
//[y] = buffer (x, n)
//[y] = buffer (x, n, p)
//[y] = buffer (x, n, p)
//[y, z, opt] = buffer (...)
//Parameters
//x: Data to be buffered
//n: Positive integer equal to number of rows in the produced data buffer
//p: Integer less than n, default value 0
//opt: In case of overlap, it can be a vector of length p or the string "nodelay", In case of underlap, it is an integer between 0 and p
//Description
//This function buffers the given data into a matrix of signal frames
//Examples
//buffer(1,3,2)
//ans =
// 0 0
// 0 1
// 1 0
//Older code
//function [y, z, opt] = buffer (x, n, p, opt)
//funcprot(0);
//lhs = argn(1)
//rhs = argn(2)
//if (rhs < 2 | rhs > 4)
//error("Wrong number of input arguments.")
//end
//
//select(rhs)
//
// case 2 then
// if(lhs==1)
// y = callOctave("buffer",x,n)
// elseif(lhs==3)
// [y,z,opt] = callOctave("buffer",x,n)
// else
// error("Wrong number of output argments.")
// end
//
// case 3 then
// if(lhs==1)
// y = callOctave("buffer",x,n,p)
// elseif(lhs==3)
// [y,z,op] = callOctave("buffer",x,n,p)
// else
// error("Wrong number of output argments.")
// end
// case 4 then
// if(lhs==1)
// y = callOctave("buffer",x,n,p,opt)
// elseif(lhs==3)
// [y,z,opt] = callOctave("buffer",x,n,p,opt)
// else
// error("Wrong number of output argments.")
// end
// end
//endfunction
function [y, z, opt] = buffer (x, n, p, opt)
[nargout, nargin] = argn() ;
if (nargin < 2 | nargin > 4)
error("buffer : invalid input");
end
if (~isscalar (n) | n ~= floor (n))
error ("buffer: n must be an integer");
end
if (nargin < 3)
p = 0;
elseif (~isscalar (p) | p ~= floor (p) | p >= n)
error ("buffer: p must be an integer less than n");
end
if (nargin < 4)
if (p < 0)
opt = 0;
else
opt = zeros (1, p);
end
end
[rows_x columns_x] = size(x) ;
if (rows_x == 1)
isrowvec = %T;
else
isrowvec = %F;
end
if (p < 0)
if (isscalar (opt) & opt == floor (opt) & opt >= 0 & opt <= -p)
lopt = opt;
else
error ("buffer: expecting fourth argument to be and integer between 0 and -p");
end
else
lopt = 0;
end
x = x (:);
l = length (x);
m = ceil ((l - lopt) / (n - p));
y = zeros (n - p, m);
y (1 : l - lopt) = x (lopt + 1 : $);
if (p < 0)
y ($ + p + 1 : $, :) = [];
elseif (p > 0)
if (type(opt) == 10)
if (strcmp (opt, "nodelay"))
y = [y ; zeros(p, m)];
if (p > n / 2)
is = n - p + 1;
in = n - p;
ie = is + in - 1;
off = 1;
while (in > 0)
y (is : ie, 1 : $ - off) = y (1 : in, 1 + off : $);
off = off + 1;
is = ie + 1;
ie = ie + in;
if (ie > n)
ie = n;
end
in = ie - is + 1;
end
[i, j] = ind2sub([n-p, m], l);
if (all ([i, j] == [n-p, m]))
off = off -1 ;
end
y (:, $ - off + 2 : $) = [];
else
y ($ - p + 1 : $, 1 : $ - 1) = y (1 : p, 2 : $);
if (sub2ind([n-p, m], p, m) >= l)
y (:, $) = [];
end
end
else
error ("buffer: unexpected string argument");
end
elseif (isvector (opt))
if (length (opt) == p)
lopt = p;
y = [zeros(p, m); y];
in = p;
off = 1;
while (in > 0)
y (1 : in, off) = opt(off:$);
off = off + 1;
in = in - n + p;
end
if (p > n / 2)
in = n - p;
ie = p;
is = p - in + 1;
off = 1;
while (ie > 0)
y (is : ie, 1 + off : $) = ...
y ($ - in + 1 : $, 1 : $ - off);
off = off + 1;
ie = is - 1;
is = is - in;
if (is < 1)
is = 1;
end
in = ie - is + 1;
end
else
y (1 : p, 2 : $) = y ($ - p + 1 : $, 1 : $ - 1);
end
else
error ("buffer: opt vector must be of length p");
end
else
error ("buffer: unrecognized fourth argument");
end
end
if (nargout > 1)
if (p >= 0)
[i, j] = ind2sub (size(y), l + lopt + p * (size (y, 2) - 1));
if (any ([i, j] ~= size (y)))
z = y (1 + p : i, $);
y (:, $) = [];
else
z = zeros (0, 1);
end
else
[i, j] = ind2sub (size (y) + [-p, 0], l - lopt);
if (i < size (y, 1))
z = y (1: i, $);
y (:, $) = [];
else
z = zeros (0, 1);
end
end
if (isrowvec)
z = z.';
end
if (p < 0)
opt = max(0, size (y, 2) * (n - p) + opt - l);
elseif (p > 0)
opt = y($-p+1:$)(:);
else
opt = [];
end
end
endfunction
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