Nothing

```
## Copyright (C) 2000 Bill Lash
##
## This file is part of Octave.
##
## Octave 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 2, or (at your option)
## any later version.
##
## Octave 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 Octave; see the file COPYING. If not, write to the Free
## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
## 02110-1301, USA.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{b} =} unwrap (@var{a}, @var{tol}, @var{dim})
##
## Unwrap radian phases by adding multiples of 2*pi as appropriate to
## remove jumps greater than @var{tol}. @var{tol} defaults to pi.
##
## Unwrap will unwrap along the first non-singleton dimension of
## @var{a}, unless the optional argument @var{dim} is given, in
## which case the data will be unwrapped along this dimension
## @} # deftypefn
## Author: Bill Lash <lash@tellabs.com>
unwrap <- function(a, tol = pi, dim = 1) {
sz = dim(a)
nd = length(sz)
if (nd == 0) {
sz = length(a)
nd = 1
}
if (! (length(dim) == 1 && dim == round(dim)) && dim > 0 && dim < (nd + 1))
stop("unwrap: dim must be an integer and valid dimension")
## Find the first non-singleton dimension
while (dim < (nd + 1) && sz[dim] == 1)
dim = dim + 1
if (dim > nd)
dim = 1
## Don't let anyone use a negative value for TOL.
tol = abs(tol)
rng = 2*pi
m = sz[dim]
## Handle case where we are trying to unwrap a scalar, or only have
## one sample in the specified dimension.
if (m == 1)
return(a)
## Take first order difference to see so that wraps will show up
## as large values, and the sign will show direction.
idx = list()
for (i in 1:nd)
idx[[i]] = 1:sz[i]
idx[[dim]] = c(1,1:(m-1))
d = a[unlist(idx)] - a
## Find only the peaks, and multiply them by the range so that there
## are kronecker deltas at each wrap point multiplied by the range
## value.
p = rng * (((d > tol) > 0) - ((d < -tol) > 0))
## Now need to "integrate" this so that the deltas become steps.
if (nd == 1)
r = cumsum(p)
else
r = apply(p, MARGIN = dim, FUN = cumsum)
## Now add the "steps" to the original data and put output in the
## same shape as originally.
a + r
}
```

**Any scripts or data that you put into this service are public.**

Embedding an R snippet on your website

Add the following code to your website.

For more information on customizing the embed code, read Embedding Snippets.