/branches/R2-1-x/octave-forge/main/comm/eyediagram.m
MATLAB | 270 lines | 247 code | 23 blank | 0 comment | 47 complexity | 89d8261ae41455c1ceb231d897da3a7e MD5 | raw file
Possible License(s): GPL-2.0, BSD-3-Clause, LGPL-2.1, GPL-3.0, LGPL-3.0
- ## 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 2 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, write to the Free Software
- ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- ## -*- texinfo -*-
- ## @deftypefn {Function File} {} eyediagram (@var{x},@var{n})
- ## @deftypefnx {Function File} {} eyediagram (@var{x},@var{n},@var{per})
- ## @deftypefnx {Function File} {} eyediagram (@var{x},@var{n},@var{per},@var{off})
- ## @deftypefnx {Function File} {} eyediagram (@var{x},@var{n},@var{per},@var{off},@var{str})
- ## @deftypefnx {Function File} {} eyediagram (@var{x},@var{n},@var{per},@var{off},@var{str},@var{h})
- ## @deftypefnx {Function File} {@var{h} =} eyediagram (@var{...})
- ##
- ## Plot the eye-diagram 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}. A single eye-diagram representing this signal is plotted.
- ## @item A complex vector
- ## In this case the in-phase and quadrature components of the signal are
- ## plotted seperately.
- ## @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.
- ## @end table
- ##
- ## Each line of the eye-diagram has @var{n} elements and the period is assumed
- ## to be given by @var{per}. The time axis is then [-@var{per}/2 @var{per}/2].
- ## By default @var{per} is 1.
- ##
- ## By default the signal is assumed to start at -@var{per}/2. This can be
- ## overridden by the @var{off} variable, which gives the number of samples
- ## to delay the signal.
- ##
- ## The string @var{str} is a plot style string (example 'r+'),
- ## and by default is the default gnuplot line 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{scatterplot}
- ## 2005-04-23 Dmitri A. Sergatskov <dasergatskov@gmail.com>
- ## * modified for new gnuplot interface (octave > 2.9.0)
- function hout = eyediagram (x, n, _per, _off, str, h)
- if ((nargin < 2) || (nargin > 6))
- usage (" h = eyediagram (x, n [, per [, off [, str [, h]]]])");
- endif
-
- if (isreal(x))
- if (min(size(x)) == 1)
- signal = "real";
- xr = x(:);
- elseif (size(x,2) == 2)
- signal = "complex";
- xr = x(:,1);
- xr = x(:,2);
- else
- error ("eyediagram: real signal input must be a vector");
- endif
- else
- signal = "complex";
- if (min(size(x)) != 1)
- error ("eyediagram: complex signal input must be a vector");
- endif
- xr = real(x(:));
- xi = imag(x(:));
- endif
-
- if (!length(xr))
- error ("eyediagram: zero length signal");
- endif
-
- if (!isscalar(n) || !isreal(n) || (floor(n) != n) || (n < 1))
- error ("eyediagram: n must be a positive non-zero integer");
- endif
- if (nargin > 2)
- if (isempty(_per))
- per = 1;
- elseif (isscalar(_per) && isreal(_per))
- per = _per;
- else
- error ("eyediagram: period must be a real scalar");
- endif
- else
- per = 1;
- endif
- if (nargin > 3)
- if (isempty(_off))
- off = 0;
- elseif (!isscalar(_off) || !isreal(_off) || (floor(_off) != _off) || ...
- (_off < 0) || (_off > (n-1)))
- error ("eyediagram: offset must be an integer between 0 and n");
- else
- off = _off;
- endif
- else
- off = 0;
- endif
- if (nargin > 4)
- if (isempty(str))
- fmt = "w l 1";
- elseif (ischar(str))
- fmt = __pltopt__ ("eyediagram", str);
- else
- error ("eyediagram: plot format must be a string");
- endif
- else
- fmt = "w l 1";
- endif
- if (nargin > 5)
- if (isempty(h))
- if (!gnuplot_has_frames)
- hout = figure ();
- else
- hout = 0;
- endif
- elseif (!isscalar(h) || !isreal(h) || (floor(h) != h) || (h < 0))
- error ("eyediagram: figure handle must be a positive integer");
- else
- if (!gnuplot_has_frames)
- error ("eyediagram: gnuplot must have frames for figure handles");
- endif
- hout = figure (h);
- endif
- else
- if (!gnuplot_has_frames)
- hout = figure ();
- else
- hout = 0;
- endif
- endif
- neven = (2*floor(n/2) == n);
- if (neven)
- horiz = (per*[0:n]/n - per/2)';
- else
- horiz = (n-2)/(n-1)*(per*[0:n-1]/(n-1) - per/2)';
- endif
- lx = length(xr);
- off = mod(off+ceil(n/2),n);
- ## Need to save data to a temporary file, since we use line breaks
- ## in the file to specify a discontinous plot to gnuplot plot. This
- ## is much faster than multiple plot commands.....
- tmpfile = tmpnam();
- try mark_for_deletion(tmpfile);
- catch
- warning("eyediagram: temporary file %s will not be deleted!\n",tmpfile)
- end
- fid = fopen(tmpfile,"w+t");
- if (fid == -1)
- error ("eyediagram: error opening temporary file");
- endif
- if (strcmp(signal,"complex"))
- if (off != 0)
- fprintf(fid, "%10.3e %10.3e %10.3e\n", [horiz(n-off+1:n), xr(1:off), ...
- xi(1:off)]');
- if (neven && (lx != off))
- fprintf(fid, "%10.3e %10.3e %10.3e\n", [horiz(n+1), xr(off+1), ...
- xi(off+1)]');
- endif
- fprintf(fid, "\n");
- indx = off;
- else
- indx = 0;
- endif
- while ((lx-indx) >= n)
- fprintf(fid, "%10.3e %10.3e %10.3e\n", [horiz(1:n), xr(indx+1:indx+n), ...
- xi(indx+1:indx+n)]');
- if (neven && (lx != indx+n))
- fprintf(fid, "%10.3e %10.3e %10.3e\n", [horiz(n+1), xr(indx+n+1), ...
- xi(indx+n+1)]');
- endif
- fprintf(fid, "\n");
- indx = indx + n;
- endwhile
- if ((lx-indx) != 0)
- fprintf(fid, "%10.3e %10.3e %10.3e\n", [horiz(1:lx-indx), ...
- xr(indx+1:lx), xi(indx+1:lx)]');
- endif
- else
- if (off != 0)
- fprintf(fid, "%10.3e %10.3e\n", [horiz(n-off+1:n), xr(1:off)]');
- if (neven && (lx != off))
- fprintf(fid, "%10.3e %10.3e\n", [horiz(n+1), xr(off+1)]');
- endif
- fprintf(fid, "\n");
- indx = off;
- else
- indx = 0;
- endif
- while ((lx-indx) >= n)
- fprintf(fid, "%10.3e %10.3e\n", [horiz(1:n), xr(indx+1:indx+n)]');
- if (neven && (lx != indx+n))
- fprintf(fid, "%10.3e %10.3e\n", [horiz(n+1), xr(indx+n+1)]');
- endif
- fprintf(fid, "\n");
- indx = indx + n;
- endwhile
- if ((lx-indx) != 0)
- fprintf(fid, "%10.3e %10.3e\n", [horiz(1:lx-indx), xr(indx+1:lx)]');
- endif
- endif
- fclose(fid);
- try ar = automatic_replot;
- catch ar = 0;
- end
- unwind_protect
- if (strcmp(signal,"complex"))
- subplot(2,1,1);
- title("Eye-diagram for in-phase signal");
- else
- oneplot();
- title("Eye-diagram for signal");
- endif
- xlabel("Time");
- ylabel("Amplitude");
-
- legend("off");
- hold off;
- __gnuplot_plot__ tmpfile ;
- if (strcmp(signal,"complex"))
- subplot(2,1,2);
- title("Eye-diagram for quadrature signal");
- __gnuplot_plot__ tmpfile using 1:3;
- endif
- unwind_protect_cleanup
- xlabel("");
- ylabel("");
- title("");
- if (strcmp(signal,"complex"))
- oneplot();
- endif
- automatic_replot = ar;
- end_unwind_protect
- ## XXX FIXME XXX
- ## Can't unlink the tmpfile now, since can't guarantee gnuplot finished
- ## with it!!!
- ## [u, msg] = unlink(tmpfile);
- endfunction