Octave plot on time/date x-axis

[djacobson]

I have searched extensively but I have hit a wall in all directions.  Please help!

I would like to plot a data set that has dates and time in the x-axis. I have found the following code, but when I enter it i get a parse error:      syntax error.  

 __gnuplot_set xdata time
 __gnuplot_set timefmt "%d/%m"
 __gnuplot_set format x "%b %d"

I am new to gnuplot so i would prefer to be able to write one octave.m script to create my plot. Any suggestions or links would be greatly appreciated.


Dan
running: octave-3.1.50, Graphics backend: gnuplot
Windows XP SP2

[Ivan Sutoris]

> I would like to plot a data set that has dates and time in the x-axis. I
> have found the following code, but when I enter it i get a parse error:
> syntax error.
>
>  __gnuplot_set xdata time
>  __gnuplot_set timefmt "%d/%m"
>  __gnuplot_set format x "%b %d"

I think Octave no longer allows to directly access gnuplot, so these
commands won't work. I don't know if there is some simple way to have
dates as tick labels, but you can always set tick labels manually,
like this:

data = [2 3 5 3.5 6];
datalabels = {'10/3/2008','10/4/2008','10/5/2008','10/6/2008','10/7/2008'};
% cell array
plot(data)
set(gca(),'xticklabels',datalabels)

Depending on your data, you could probably use something like
datestr() to fill cell array with respective dates as strings. Setting
graphic properties with get() and set() functions is documented in
Octave manual (section about advanced plotting), and since Octave
developers try to keep things compatible with MATLAB, I've found
reference on Mathworks site also useful.

Hope this helped
Ivan Sutoris
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[djacobson]

I think Octave no longer allows to directly access gnuplot, so these
commands won't work. I don't know if there is some simple way to have
dates as tick labels, but you can always set tick labels manually,
like this:

data = [2 3 5 3.5 6];
datalabels = {'10/3/2008','10/4/2008','10/5/2008','10/6/2008','10/7/2008'};
% cell array
plot(data)
set(gca(),'xticklabels',datalabels)

Depending on your data, you could probably use something like
datestr() to fill cell array with respective dates as strings. Setting
graphic properties with get() and set() functions is documented in
Octave manual (section about advanced plotting), and since Octave
developers try to keep things compatible with MATLAB, I've found
reference on Mathworks site also useful.

Hope this helped
Ivan Sutoris
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Ivan,
I tried your example and i have looked at the gca/set documentation. When i run your code (using 'xticklabel' instead of 'xticklabels' i still only get the plot with the indicies 1,2,3,4,5 along the x-axis. Could there be something missing from my installation or is there a package i need to load?
thanks, dan.

[Bill Denney-5]

Ivan Sutoris wrote:

>> I would like to plot a data set that has dates and time in the x-axis. I
>> have found the following code, but when I enter it i get a parse error:
>> syntax error.
>>
>>  __gnuplot_set xdata time
>>  __gnuplot_set timefmt "%d/%m"
>>  __gnuplot_set format x "%b %d"
>>    
>
> I think Octave no longer allows to directly access gnuplot, so these
> commands won't work. I don't know if there is some simple way to have
> dates as tick labels, but you can always set tick labels manually,
> like this:
>
> data = [2 3 5 3.5 6];
> datalabels = {'10/3/2008','10/4/2008','10/5/2008','10/6/2008','10/7/2008'};
> % cell array
> plot(data)
> set(gca(),'xticklabels',datalabels)

If you install the financial package, you can use the dateaxis command
which likely does what you're wanting to do.

Have a good day,

Bill
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[rmcd]

Bill Denney-5 wrote:
>
> If you install the financial package, you can use the dateaxis command
> which likely does what you're wanting to do.
>

I've just been trying to use dateaxis (cygwin, octave 3.0.1). I run this:

x=732000:732010;
plot(x,x);
dateaxis("x");
ticks=get(gca(), "xtick");

I get this:
error: invalid matrix index = 1
error: evaluating binary operator `-' near line 94, column 17
error: evaluating binary operator `+' near line 94, column 28
error: evaluating assignment expression near line 94, column 9
error: called from `dateaxis' in file
`/usr/share/octave/packages/financial-0.2.2/dateaxis.m'

Looking through the dateaxis code, ticks has a value of [](0x0), which I
gather is due to the automatic tick assignment.

Am I missing something obvious about dateaxis? Thanks very much.


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[rmcd]

rmcd wrote:
>
> x=732000:732010;
> plot(x,x);
> dateaxis("x");
> ticks=get(gca(), "xtick");
>

Just to be clear, the dateaxis command does not change the axis (probably
obvious giventhe error messages I quoted) and the get command was simply my
attempt to debug the problem.

Thanks, and sorry for the extra post.
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[David Bateman]

Bill Denney wrote:

> Ivan Sutoris wrote:
>  
>>> I would like to plot a data set that has dates and time in the x-axis. I
>>> have found the following code, but when I enter it i get a parse error:
>>> syntax error.
>>>
>>>  __gnuplot_set xdata time
>>>  __gnuplot_set timefmt "%d/%m"
>>>  __gnuplot_set format x "%b %d"
>>>    
>>>      
>> I think Octave no longer allows to directly access gnuplot, so these
>> commands won't work. I don't know if there is some simple way to have
>> dates as tick labels, but you can always set tick labels manually,
>> like this:
>>
>> data = [2 3 5 3.5 6];
>> datalabels = {'10/3/2008','10/4/2008','10/5/2008','10/6/2008','10/7/2008'};
>> % cell array
>> plot(data)
>> set(gca(),'xticklabels',datalabels)
>>    
> If you install the financial package, you can use the dateaxis command
> which likely does what you're wanting to do.
>
> Have a good day,
>
>  

How does dateaxis differ from the dateticks function?  Taking a quick
look at the matlab help pages, I can see that much of a difference in
them. Perhaps we should migrate dateaxis to Octave as the dateticks
command and make dateaxis depend on dateticks?

Cheers
David



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[Bill Denney-5]

David Bateman wrote:
> Bill Denney wrote:
>> If you install the financial package, you can use the dateaxis command
>> which likely does what you're wanting to do.
>
> How does dateaxis differ from the dateticks function?  Taking a quick
> look at the matlab help pages, I can see that much of a difference in
> them. Perhaps we should migrate dateaxis to Octave as the dateticks
> command and make dateaxis depend on dateticks?

It differs in that I didn't know about it when I was implementing
dateaxis.  You're right that it's a good idea to migrate it to Octave
and have dateaxis be a call to datetick.  I probably won't be able to do
it soon, though because I'm moving in the next 1.5 weeks.

Have a good day,

Bill
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[David Bateman]

Bill Denney wrote:

> David Bateman wrote:
>  
>> Bill Denney wrote:
>>    
>>> If you install the financial package, you can use the dateaxis command
>>> which likely does what you're wanting to do.
>>>      
>> How does dateaxis differ from the dateticks function?  Taking a quick
>> look at the matlab help pages, I can see that much of a difference in
>> them. Perhaps we should migrate dateaxis to Octave as the dateticks
>> command and make dateaxis depend on dateticks?
>>    
>
> It differs in that I didn't know about it when I was implementing
> dateaxis.  You're right that it's a good idea to migrate it to Octave
> and have dateaxis be a call to datetick.  I probably won't be able to do
> it soon, though because I'm moving in the next 1.5 weeks.
>
> Have a good day,
>
> Bill
>
>  

How about something like the attached? Notice that for datetick we have

to calculate the tick positions ourselves manually as they should fall
of reasonable times. I've attempted to do this in this version, but it
probably needs some work.

With this changeset dateaxis can then be implemented as

function varargout = dateaxis (varargin);
    [varargout{:}] = datetick (varargin{:});
endfunction

In any case this was based heavily on your dateaxis code Bill.

Cheers
David


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# HG changeset patch
# User David Bateman <dbateman@...>
# Date 1221574709 -7200
# Node ID d246e374921480a55740d87c6508d90b26b3aa42
# Parent  0ed57cb917a1e9ea4c13c8be56c958bf89da0110
Add the datetick function

diff --git a/scripts/ChangeLog b/scripts/ChangeLog
--- a/scripts/ChangeLog
+++ b/scripts/ChangeLog
@@ -1,3 +1,12 @@ 2008-09-15  David Bateman  <dbateman@fre
[phone]  David Bateman  <dbateman@...>
+
+ * time/datetick.m: New function.
+ * time/Makefile.in (SOURCES): Add it here.
+ * time/datestr.m: More careful check for datevec format with 6
+ column arguments.
+ * plot/__go_draw_axes__ (do_tics_1): Use %.15g format rather than
+ %g format. Also use manual mode if xlabelmode is manual.
+
 2008-09-15  David Bateman  <dbateman@...>
 
  * general/cell2mat.m: Backout previous change. Special case 2D
diff --git a/scripts/plot/__go_draw_axes__.m b/scripts/plot/__go_draw_axes__.m
--- a/scripts/plot/__go_draw_axes__.m
+++ b/scripts/plot/__go_draw_axes__.m
@@ -1549,7 +1549,7 @@ function do_tics_1 (ticmode, tics, label
 function do_tics_1 (ticmode, tics, labelmode, labels, color, ax,
     plot_stream, mirror, mono, axispos, tickdir)
   colorspec = get_text_colorspec (color, mono);
-  if (strcmpi (ticmode, "manual"))
+  if (strcmpi (ticmode, "manual") || strcmpi (labelmode, "manual"))
     if (isempty (tics))
       fprintf (plot_stream, "unset %stics;\n", ax);
     elseif (strcmpi (labelmode, "manual") && ! isempty (labels))
@@ -1562,14 +1562,15 @@ function do_tics_1 (ticmode, tics, label
  nlabels = numel (labels);
  fprintf (plot_stream, "set format %s \"%%s\";\n", ax);
  if (mirror)
-  fprintf (plot_stream, "set %stics %s %s (", ax, tickdir, axispos);
+  fprintf (plot_stream, "set %stics %s %s mirror (", ax,
+   tickdir, axispos);
  else
   fprintf (plot_stream, "set %stics %s %s nomirror (", ax,
    tickdir, axispos);
  endif
  labels = regexprep(labels, "%", "%%");
  for i = 1:ntics
-  fprintf (plot_stream, " \"%s\" %g", labels{k++}, tics(i));
+  fprintf (plot_stream, " \"%s\" %.15g", labels{k++}, tics(i));
   if (i < ntics)
     fputs (plot_stream, ", ");
   endif
@@ -1584,13 +1585,14 @@ function do_tics_1 (ticmode, tics, label
     else
       fprintf (plot_stream, "set format %s \"%%g\";\n", ax);
       if (mirror)
- fprintf (plot_stream, "set %stics %s %s (", ax, tickdir, axispos );
+ fprintf (plot_stream, "set %stics %s %s mirror (", ax, tickdir,
+ axispos);
       else
  fprintf (plot_stream, "set %stics %s %s nomirror (", ax, tickdir,
  axispos);
       endif
-      fprintf (plot_stream, " %g,", tics(1:end-1));
-      fprintf (plot_stream, " %g);\n", tics(end));
+      fprintf (plot_stream, " %.15g,", tics(1:end-1));
+      fprintf (plot_stream, " %.15g);\n", tics(end));
     endif
   else
     fprintf (plot_stream, "set format %s \"%%g\";\n", ax);
diff --git a/scripts/time/Makefile.in b/scripts/time/Makefile.in
--- a/scripts/time/Makefile.in
+++ b/scripts/time/Makefile.in
@@ -33,8 +33,8 @@ INSTALL_DATA = @INSTALL_DATA@
 INSTALL_DATA = @INSTALL_DATA@
 
 SOURCES = addtodate.m asctime.m calendar.m clock.m ctime.m date.m \
-  datenum.m datestr.m datevec.m eomday.m etime.m is_leap_year.m now.m \
-  weekday.m
+  datenum.m datestr.m datetick.m datevec.m eomday.m etime.m is_leap_year.m \
+  now.m weekday.m
 
 DISTFILES = $(addprefix $(srcdir)/, Makefile.in $(SOURCES))
 
diff --git a/scripts/time/datestr.m b/scripts/time/datestr.m
--- a/scripts/time/datestr.m
+++ b/scripts/time/datestr.m
@@ -196,7 +196,8 @@ function retval = datestr (date, f, p)
       ## Make sure that the input really is a datevec.
       maxdatevec = [Inf, 12, 31, 23, 59, 60];
       for i = 1:numel (maxdatevec)
-        if (any (date(:,i) > maxdatevec(i)))
+        if (any (date(:,i) > maxdatevec(i)) ||
+    (i != 6 && any (floor (date(:, i)) != date (:, i))))
           v = datevec (date, p);
           break;
         endif
diff --git a/scripts/time/datetick.m b/scripts/time/datetick.m
new file mode 100644
--- /dev/null
+++ b/scripts/time/datetick.m
@@ -0,0 +1,288 @@
+## Copyright (C) 2008  David Bateman
+##
+## 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 3 of the License, 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, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} datetick (@var{form})
+## @deftypefnx {Function File} {} datetick (@var{axis}, @var{form})
+## @deftypefnx {Function File} {} datetick (@dots{}, "keeplimits")
+## @deftypefnx {Function File} {} datetick (@dots{}, "keepticks")
+## @deftypefnx {Function File} {} datetick (@dots{ax}, @dots{})
+## Adds date formatted tick labels to an axis. The axis the apply the
+## ticks to is determined by @var{axis} that can take the values "x",
+## "y" or "z". The default value is "x". The formating of the labels is
+## determined by the variable @var{form}, that can either be a string in
+## the format needed by @code{dateform}, or a positive integer that can
+## be accepted by @code{datestr}.
+## @seealso{datenum, datestr}
+## @end deftypefn
+
+function datetick (varargin)
+
+  [h, varargin, nargin] = __plt_get_axis_arg__ ("datetick", varargin{:});
+
+  if (nargin < 1)
+    print_usage ();
+  else
+    oldh = gca ();
+    unwind_protect
+      axes (h);
+      __datetick__ (varargin{:});
+    unwind_protect_cleanup
+      axes (oldh);
+    end_unwind_protect
+  endif
+endfunction
+
+%!demo
+%! yr = 1900:10:2000;
+%! pop = [76.094, 92.407, 106.461, 123.077 131.954, 151.868, 179.979, ...
+%!        203.984, 227.225, 249.623, 282.224];
+%! plot (datenum (yr, 1, 1), pop);
+%! title ("US population (millions)");
+%! xlabel ("Year");
+%! datetick ("x", "YYYY");
+
+function __datetick__ (varargin)
+
+  keeplimits = false;
+  keeptick = false;
+  idx = [];
+  for i = 1 : nargin
+    arg = varargin {i};
+    if (ischar (arg))
+      if (strcmpi (arg, "keeplimits"))
+ keeplimits = true;
+ idx = [idx, i];
+      elseif (strcmpi (arg, "keeptick"))
+ keeptick = true;
+ idx = [idx, i];
+      endif
+    endif
+  endfor
+
+  varargin(idx) = [];
+  nargin = length (varargin);
+  form = [];
+  ax = "x";
+
+  if (nargin != 0)
+    arg = varargin{1};
+    if (ischar(arg) && (strcmp (arg, "x") || strcmp (arg, "y") ||
+ strcmp (arg, "z")))
+      ax = arg;
+      if (nargin > 1)
+ form = varargin{2};
+ varargin(1:2) = [];
+      else
+ varargin(1) = [];
+      endif
+    else
+      form = arg;
+      varargin(1) = [];
+    endif
+  endif
+
+  ## Don't publish the existence of this variable for use with dateaxis
+  if (length (varargin) > 0)
+    startdate = varargin{1};
+  else
+    startdate = [];
+  endif
+
+  if (isnumeric (form))
+    if (! isscalar (form) || floor (form) != form || form < 0)
+      error ("datetick: expecting form argument to be a positive integer");
+    endif
+  elseif (! ischar (form) && !isempty (form))
+    error ("datetick: expecting valid date format string");
+  endif
+
+  if (keeptick)
+    ticks = get (gca (), strcat (ax, "tick"))
+  else
+    ## Need to do our own axis tick position calculation as
+    ## year, etc, don't fallback on nice datenum values.
+    objs = findall (gca());
+    xmax = NaN;
+    xmin = NaN;
+    for i = 1 : length (objs)
+      fld = get (objs (i));
+      if (isfield (fld, strcat (ax, "data")))
+ xdata = getfield (fld, strcat (ax, "data"))(:);
+ xmin = min (xmin, min (xdata));
+ xmax = max (xmax, max (xdata));
+      endif
+    endfor
+
+    if (isnan (xmin) || isnan (xmax))
+      xmin = 0;
+      xmax = 1;
+    elseif (xmin == xmax)
+      xmax = xmin + 1;
+    endif
+
+    N = 3;
+    if (xmax - xmin < N)
+      ## Day scale or less
+      if (xmax - xmin < N / 24 / 60 / 60)
+ scl = 1 / 24 / 60 / 60;
+      elseif (xmax - xmin < N / 24 / 6)
+ scl = 1 / 24 / 60;
+      else
+ scl = 1 / 24;
+      endif
+      sep = __calc_tick_sep__ (xmin / scl , xmax / scl);
+      xmin = sep * floor (xmin / scl / sep);
+      xmax = sep * ceil (xmax / scl / sep);
+      nticks = (xmax - xmin) / sep + 1;
+      xmin *= scl;
+      xmax *= scl;
+    else
+      [ymin, mmin, dmin] = datevec (xmin);
+      [ymax, mmax, dmax] = datevec (xmax);
+      minyear = ymin + (mmin - 1) / 12 + (dmin - 1) / 12 / 30;    
+      maxyear = ymax + (mmax - 1) / 12 + (dmax - 1) / 12 / 30;    
+      minmonth = mmin + (dmin - 1) / 30;    
+      maxmonth = (ymax  - ymin) * 12 + mmax + (dmax - 1) / 30;    
+
+      if (maxmonth - minmonth < N)
+ sep = __calc_tick_sep__ (xmin, xmax);
+ xmin = sep * floor (xmin / sep);
+ xmax = sep * ceil (xmax / sep);
+ nticks = (xmax - xmin) / sep + 1;
+      elseif (maxyear - minyear < N)
+ sep = __calc_tick_sep__ (minmonth , maxmonth);
+ xmin = datenum (ymin, sep * floor (minmonth / sep), 1);
+ xmax = datenum (ymin, sep * ceil (maxmonth / sep), 1);
+ nticks = ceil (maxmonth / sep) - floor (minmonth / sep) + 1;
+      else
+ sep = __calc_tick_sep__ (minyear , maxyear);
+ xmin = datenum (sep * floor (minyear / sep), 1, 1);
+ xmax = datenum (sep * ceil (maxyear / sep), 1, 1);
+ nticks = ceil (maxyear / sep) - floor (minyear / sep) + 1;
+      endif
+    endif
+    ticks = xmin + [0 : nticks - 1] / (nticks - 1) * (xmax - xmin);
+  endif
+
+  if (isempty (form))
+    r = max(ticks) - min(ticks);
+    if r < 10/60/24
+      ## minutes and seconds
+      form = 13;
+    elseif r < 2
+      ## hours
+      form = 15;
+    elseif r < 15
+      ## days
+      form = 8;
+    elseif r < 365
+      ## months
+      form = 6;
+    elseif r < 90*12
+      ## quarters
+      form = 27;
+    else
+      ## years
+      form = 10;
+    endif
+  endif
+
+  if (length (ticks) == 6)
+    ## Careful that its not treated as a datevec
+    if (! isempty (startdate))
+      sticks = strvcat (datestr (ticks(1:end-1) - ticks(1) + startdate, form),
+ datestr (ticks(end) - ticks(1) + startdate, form));
+    else
+      sticks = strvcat (datestr (ticks(1:end-1), form),
+ datestr (ticks(end), form));
+    endif
+  else
+    if (! isempty (startdate))
+      sticks = datestr (ticks - ticks(1) + startdate, form);
+    else
+      sticks = datestr (ticks, form);
+    endif
+  endif
+
+  sticks = mat2cell (sticks, ones (rows (sticks), 1), columns (sticks));
+
+  if (keeptick)
+    if (keeplimits)
+      set (gca(), strcat (ax, "ticklabel"), sticks);
+    else
+      set (gca(), strcat (ax, "ticklabel"), sticks, strcat (ax, "lim"),
+   [min(ticks), max(ticks)]);
+    endif
+  else
+    if (keeplimits)
+      set (gca(), strcat (ax, "tick"), ticks, strcat (ax, "ticklabel"), sticks);
+    else
+      set (gca(), strcat (ax, "tick"), ticks, strcat (ax, "ticklabel"), sticks,
+   strcat (ax, "lim"), [min(ticks), max(ticks)]);
+    endif
+  endif
+endfunction
+
+function [a, b] = __magform__ (x)
+  if (x == 0)
+    a = 0;
+    b = 0;
+  else
+    l = log10 (abs (x));
+    r = fmod (l, 1);
+    a = 10 .^ r;
+    b = fix (l - r);
+    if (a < 1)
+      a *= 10;
+      b -= 1;
+    endif
+    if (x < 0)
+      a = -a;
+    endif
+  endif
+endfunction
+
+## A translation from Tom Holoryd's python code at
+## http://kurage.nimh.nih.gov/tomh/tics.py
+function sep = __calc_tick_sep__ (lo, hi)
+  persistent sqrt_2  = sqrt (2.0);
+  persistent sqrt_10 = sqrt (10.0);
+  persistent sqrt_50 = sqrt (50.0);
+
+  ticint = 5;
+
+  ## Reference: Lewart, C. R., "Algorithms SCALE1, SCALE2, and
+  ## SCALE3 for Determination of Scales on Computer Generated
+  ## Plots", Communications of the ACM, 10 (1973), 639-640.
+  ## Also cited as ACM Algorithm 463.
+
+  [a, b] = __magform__ ((hi - lo) / ticint);
+
+  if (a < sqrt_2)
+    x = 1;
+  elseif (a < sqrt_10)
+    x = 2;
+  elseif (a < sqrt_50)
+    x = 5;
+  else
+    x = 10;
+  endif
+  sep = x * 10 .^ b;
+endfunction
+

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[Ivan Sutoris]

> Ivan,
> I tried your example and i have looked at the gca/set documentation. When i
> run your code (using 'xticklabel' instead of 'xticklabels' i still only get
> the plot with the indicies 1,2,3,4,5 along the x-axis. Could there be
> something missing from my installation or is there a package i need to load?
> thanks, dan.
> --

It worked for me with JHandles graphics, and I thought I tried it also
with gnuplot, but apparently not, so sorry for misleading (and for the
typo). However, I played with it a little more (with gnuplot now :)
and I've found out that if you also specify xtick position manually,
the code should work (I'm not sure if that is a feature or bug):

data = [2 3 5 3.5 6];
datalabels = {'10/3/2008','10/4/2008','10/5/2008','10/6/2008','10/7/2008'};
plot(data)
set(gca(),'xtick',1:5) % set tick pos. manually
set(gca(),'xticklabel',datalabels)

Ivan Sutoris
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[John W. Eaton]

On 16-Sep-2008, David Bateman wrote:

| Bill Denney wrote:
| > David Bateman wrote:
| >  
| >> Bill Denney wrote:
| >>    
| >>> If you install the financial package, you can use the dateaxis command
| >>> which likely does what you're wanting to do.
| >>>      
| >> How does dateaxis differ from the dateticks function?  Taking a quick
| >> look at the matlab help pages, I can see that much of a difference in
| >> them. Perhaps we should migrate dateaxis to Octave as the dateticks
| >> command and make dateaxis depend on dateticks?
| >>    
| >
| > It differs in that I didn't know about it when I was implementing
| > dateaxis.  You're right that it's a good idea to migrate it to Octave
| > and have dateaxis be a call to datetick.  I probably won't be able to do
| > it soon, though because I'm moving in the next 1.5 weeks.
| >
| > Have a good day,
| >
| > Bill
| >
| >  
| How about something like the attached? Notice that for datetick we have
| to calculate the tick positions ourselves manually as they should fall
| of reasonable times. I've attempted to do this in this version, but it
| probably needs some work.
|
| With this changeset dateaxis can then be implemented as
|
| function varargout = dateaxis (varargin);
|     [varargout{:}] = datetick (varargin{:});
| endfunction

It's not that simple.  It think you'll need to handle nargout == 0
separately, and also initiailize varargout = cell (1, nargout) for the
case of nargout > 0.

| In any case this was based heavily on your dateaxis code Bill.

After applying the patch, I see

  octave:11> demo datetick
  datetick example 1:
   yr = 1900:10:2000;
   pop = [76.094, 92.407, 106.461, 123.077 131.954, 151.868, 179.979, ...
          203.984, 227.225, 249.623, 282.224];
   plot (datenum (yr, 1, 1), pop);
   title ("US population (millions)");
   xlabel ("Year");
   datetick ("x", "YYYY");

  error: structure has no member `__colorbar__'
  error: evaluating argument list element number 1
  error: called from:
  error:   /home/jwe/src/octave/scripts/plot/__go_draw_figure__.m at line 44, column 1
  error:   /home/jwe/src/octave/scripts/plot/gnuplot_drawnow.m at line 68, column 5

What am I missing?

jwe
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[dbateman]

John W. Eaton wrote:

After applying the patch, I see

  octave:11> demo datetick
  datetick example 1:
   yr = 1900:10:2000;
   pop = [76.094, 92.407, 106.461, 123.077 131.954, 151.868, 179.979, ...
          203.984, 227.225, 249.623, 282.224];
   plot (datenum (yr, 1, 1), pop);
   title ("US population (millions)");
   xlabel ("Year");
   datetick ("x", "YYYY");

  error: structure has no member `__colorbar__'
  error: evaluating argument list element number 1
  error: called from:
  error:   /home/jwe/src/octave/scripts/plot/__go_draw_figure__.m at line 44, column 1
  error:   /home/jwe/src/octave/scripts/plot/gnuplot_drawnow.m at line 68, column 5

What am I missing?

I suspect that the cell2mat patch I sent with the changes for plotyy and colorbar accidentally included has left traces in your graphics.h.in file with the __colorbar__ property being removed.. Sorry for that mess.. Put __colorbar__ back in as an axis property and it should work..

D.


jwe
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[John W. Eaton]

On 17-Sep-2008, dbateman wrote:

| > After applying the patch, I see
| >
| >   octave:11> demo datetick
| >   datetick example 1:
| >    yr = 1900:10:2000;
| >    pop = [76.094, 92.407, 106.461, 123.077 131.954, 151.868, 179.979, ...
| >  203.984, 227.225, 249.623, 282.224];
| >    plot (datenum (yr, 1, 1), pop);
| >    title ("US population (millions)");
| >    xlabel ("Year");
| >    datetick ("x", "YYYY");
| >
| >   error: structure has no member `__colorbar__'
| >   error: evaluating argument list element number 1
| >   error: called from:
| >   error:   /home/jwe/src/octave/scripts/plot/__go_draw_figure__.m at line
| > 44, column 1
| >   error:   /home/jwe/src/octave/scripts/plot/gnuplot_drawnow.m at line 68,
| > column 5
| >
| > What am I missing?
| >
|
| I suspect that the cell2mat patch I sent with the changes for plotyy and
| colorbar accidentally included has left traces in your graphics.h.in file
| with the __colorbar__ property being removed.. Sorry for that mess.. Put
| __colorbar__ back in as an axis property and it should work..

Oops.  The property was there, but I must have been using an old build
not updated since I undid the bad cell2mat patch.  Running make to fix
update the build seems to have fixed the problem, so your datetick
changeset is applied now.

Thanks,

jwe
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[djacobson]

Thanks for the help! your example got me up and running in no time.
{
data = [2 3 5 3.5 6];
datalabels = {'10/3/2008','10/4/2008','10/5/2008','10/6/2008','10/7/2008'};
plot(data)
set(gca(),'xtick',1:5) % set tick pos. manually
set(gca(),'xticklabel',datalabels)
}
figure.png