[Octave-bug-tracker] [bug #47707] hist takes up a lot of memory

[Carnë Draug]

URL:
  <http://savannah.gnu.org/bugs/?47707>

                 Summary: hist takes up a lot of memory 
                 Project: GNU Octave
            Submitted by: carandraug
            Submitted on: Fri 15 Apr 2016 18:05:52 GMT
                Category: Performance
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Performance
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

    _______________________________________________________

Details:

The function hist converts the input vector or matrix to class double to avoid
any issues with integers

http://hg.savannah.gnu.org/hgweb/octave/file/1dda942a2514/scripts/plot/draw/hist.m


  ## Avoid issues with integer types for x and y
  x = double (x);
  y = double (y);


If the input is uint8 (very common in images), that's an 8x increase in memory
usage.  In my current case, I have a 480x480x15x28 image (uint16) which is
roughly 190Mb but Octave needs 4GB of memory to make an histogram of the
image.




    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?47707>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.gnu.org/