[Octave-bug-tracker] [bug #46484] datetick does not "keeplimits"

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?46484>

                 Summary: datetick does not "keeplimits"
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Fr 20 Nov 2015 19:43:49 UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: Lars K.
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

When datetick() is called with the "keeplimits" argument it should conserve
the xlim resp. ylim property of the axis. That is the intended behavior and
also what matlab does. At the moment, however, datetick.m always recalculates
the limits based on the data. As a result it is not possible to reapply date
labels after zooming in either from the gui or calling the xlim() or ylim()
function:


t0=datenum('2015-01-01');
t=t0:1/1440:t0+30; %one month
x=sin(2*pi*(t-t0));
plot(t,x)
datetick x
disp "press enter to show one week only!"
pause
xlim([t0 t0+7]);
disp "press enter to apply datetick again!"
pause
datetick x keeplimits 
%this will rescale to full data limits


This patch will fix it:


diff -r a5949b3d2332 scripts/plot/appearance/datetick.m
--- a/scripts/plot/appearance/datetick.m        Thu Nov 19 14:39:04 2015 -0800
+++ b/scripts/plot/appearance/datetick.m        Fri Nov 20 19:51:30 2015 +0100
@@ -144,18 +144,24 @@
   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, [ax "data"]))
-        xdata = getfield (fld, [ax "data"])(:);
-        xmin = min (xmin, min (xdata));
-        xmax = max (xmax, max (xdata));
-      endif
-    endfor
-
+    if (keeplimits)
+      limits=get (gca (), [ax "lim"]);
+      xmin=limits(1);
+      xmax=limits(2);  
+    else
+      objs = findall (gca ());
+      xmax = NaN;
+      xmin = NaN;
+      for i = 1 : length (objs)
+        fld = get (objs (i));
+        if (isfield (fld, [ax "data"]))
+          xdata = getfield (fld, [ax "data"])(:);
+          xmin = min (xmin, min (xdata));
+          xmax = max (xmax, max (xdata));
+        endif
+      endfor
+    endif
+  
     if (isnan (xmin) || isnan (xmax))
       xmin = 0;
       xmax = 1;







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