octave-communications-common 1.1.1-1 / usr / share / octave / packages / communications-1.1.1 / scatterplot.m

This file is indexed.

/usr/share/octave/packages/communications-1.1.1/scatterplot.m is in octave-communications-common 1.1.1-1.

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
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
## Copyright (C) 2003 David Bateman
##
## 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/>.

## -*- texinfo -*-
## @deftypefn {Function File} {} scatterplot (@var{x})
## @deftypefnx {Function File} {} scatterplot (@var{x},@var{n})
## @deftypefnx {Function File} {} scatterplot (@var{x},@var{n},@var{off})
## @deftypefnx {Function File} {} scatterplot (@var{x},@var{n},@var{off},@var{str})
## @deftypefnx {Function File} {} scatterplot (@var{x},@var{n},@var{off},@var{str},@var{h})
## @deftypefnx {Function File} {@var{h} =} scatterplot (@var{...})
##
## Display the scatter plot of a signal. The signal @var{x} can be either in
## one of three forms
##
## @table @asis
## @item A real vector
## In this case the signal is assumed to be real and represented by the vector
## @var{x}. The scatterplot is plotted along the x axis only.
## @item A complex vector
## In this case the in-phase and quadrature components of the signal are 
## plotted seperately on the x and y axes respectively.
## @item A matrix with two columns
## In this case the first column represents the in-phase and the second the
## quadrature components of a complex signal and are plotted on the x and
## y axes respectively.
## @end table
##
## Each point of the scatter plot is assumed to be seperated by @var{n} 
## elements in the signal. The first element of the signal to plot is 
## determined by @var{off}. By default @var{n} is 1 and @var{off} is 0.
##
## The string @var{str} is a plot style string (example 'r+'),
## and by default is the default gnuplot point style.
##
## The figure handle to use can be defined by @var{h}. If @var{h} is not 
## given, then the next available figure handle is used. The figure handle
## used in returned on @var{hout}.
## @end deftypefn
## @seealso{eyediagram}

## 2005-04-23 Dmitri A. Sergatskov <dasergatskov@gmail.com>
##     * modified for new gnuplot interface (octave > 2.9.0)

function varargout = scatterplot (x, n, _off, str, h)

  if ((nargin < 1) || (nargin > 5))
    usage (" h = scatterplot (x, n [, off [, str [, h]]]])");
  endif
  
  if (isreal(x))
    if (min(size(x)) == 1)
      signal = "real";
      xr = x(:);
      xi = zeros(size(xr));
    elseif (size(x,2) == 2)
      signal = "complex";
      xr = x(:,1);
      xi = x(:,2);
    else
      error ("scatterplot: real signal input must be a vector");
    endif
  else
    signal = "complex";
    if (min(size(x)) != 1)
      error ("scatterplot: complex signal input must be a vector");
    endif
    xr = real(x(:));
    xi = imag(x(:));
  endif
  
  if (!length(xr))
    error ("scatterplot: zero length signal");
  endif
  
  if (nargin > 1)
    if (!isscalar(n) || !isreal(n) || (floor(n) != n) || (n < 1))
      error ("scatterplot: n must be a positive non-zero integer");
    endif
  else
    n = 1;
  endif
  
  if (nargin > 2)
    if (!isscalar(_off) || !isreal(_off) || (floor(_off) != _off) || ...
	(_off < 0) || (_off > length(x)-1))
      error ("scatterplot: offset must be an integer between 0 and length(x)-1");
    endif
    off = _off;
  else
    off = 0;
  endif

  if (nargin > 3)
    if (isempty(str))
      fmt = "-r";
    elseif (ischar(str))
      fmt = str;
    else
      error ("scatterplot: plot format must be a string");
    endif
  else
    fmt = "-r";
  endif

  if (nargin > 4)
    hout = figure (h);
  else
    hout = figure ();
  endif

  xr = xr(off+1:n:rows(xr));
  xi = xi(off+1:n:rows(xi));

  plot(xr,xi,fmt);
  if (!strcmp(signal,"complex"))
    ## FIXME: What is the appropriate xrange
    xmax = max(xr);
    xmin = min(xr);
    xran = xmax - xmin
    xmax =  ceil(2 * xmax / xran) / 2 * xran;
    xmin = floor(2 * xmin / xran) / 2 * xran;
    axis([xmin, xmax, -1, 1]);
  endif
  title("Scatter plot");
  xlabel("In-phase");
  ylabel("Quadrature");
  legend("off");

  if (nargout > 0)
    varargout{1} = hout;
  endif

endfunction

%!demo
%! n = 200;
%! ovsp=5;
%! x = 1:n;
%! xi = [1:1/ovsp:n-0.1];
%! y = randsrc(1,n,[1 + 1i, 1 - 1i, -1 - 1i, -1 + 1i]) ;
%! yi = interp1(x,y,xi);
%! noisy = awgn(yi,15,"measured");
%! hold off;
%! h = scatterplot(noisy,1,0,"b",1);
%! hold on;
%! scatterplot(noisy,ovsp,0,"r+",h);

APT Browse - Built by Thomas Orozco.