Re: figures not saved inside loop

[Tatsuro MATSUOKA]

----- Original Message -----
>From: andre valente <address@hidden>
>To: Juan Pablo Carbajal <address@hidden> 
>Cc: "address@hidden" <address@hidden>; "address@hidden" <address@hidden>
>Date: 2015/6/30, Tue 19:19
>Subject: RE: figures not saved inside loop
> 
>
> 
>> Date: Tue, 30 Jun 2015 12:01:16 +0200
>
>> Subject: Re: figures not saved inside loop
>> From: address@hidden
>> To: address@hidden
>> CC: address@hidden; address@hidden
>> 
>> On Tue, Jun 30, 2015 at 11:57 AM, andre valente <address@hidden> wrote:
>> > The problem is quite simple. For example the code below, sometimes saves 
>> > all
>> > the figures, sometimes it doesn't. This is not my regular machine, so I
>> > guess the problem is with the machine and not with octave.. anyway I would
>> > be very happy to fix this problem.
>> >
>> > a=rand(100,20);
>> > for i=1:20;
>> > figure;plot(a(:,i));
>> > outname=strcat('figure_',num2str(i));
>> > eval(['print -dpng ',outname]);
>> > close;
>> > end
>> >
>> >
>> >> Date: Mon, 29 Jun 2015 21:44:06 +0200
>> >> Subject: Re: figures not saved inside loop
>> >> From: address@hidden
>> >> To: address@hidden
>> >> CC: address@hidden; address@hidden
>> >>
>> >> On Mon, Jun 29, 2015 at 8:05 PM, andre valente <address@hidden>
>> >> wrote:
>> >> > Hello,
>> >> >
>> >> > I have a loop quite fast (not sure this is part of the problem) making
>> >> > plots
>> >> > and saving them as png's. Some of the figures are not saved. I made some
>> >> > tests, and appears to be random.. sometimes it saves, other times it
>> >> > doesn't. They pop-up as figures, but just are not saved. Is this normal?
>> >> > It
>> >> > is quite a problem for me.. Hope you can help. Thanks.
>> >> >
>> >> > I am using version 3.8.2 for x86_64-redhat-linux-gnu .
>> >> >
>> >> > Regards,
>> >> > Andre
>> >> >
>> >> > _______________________________________________
>> >> > Help-octave mailing list
>> >> > address@hidden
>> >> > https://lists.gnu.org/mailman/listinfo/help-octave
>> >> >
>> >>
>> >> I do not have this problem. Could you share your test code to see if
>> >> we can reproduce.
>> 
>> Try,
>> 
>> figure (1);
>> outname = @(x) sprintf ("figure_%d.png", x)
>> a = rand (100,20);
>> for i = 1:20;
>>   clf;
>>   plot (a(:,i));
>>   print ("-dpng",outname (i));
>> end
>> 
>> If it doesn't work: What is the output of
>> 
>> graphics_toolkit
>> 
>> ?
>> 
>> PS: Please answer at the bottom of the message as I am doing here.
>
>Ok, I tried 4 times and saved all figures. So it appears to work. What do you 
>think was the problem with my script? Or the solution with yours? 
>The "clf" before the figure? 
>Opening a figure before?
>How you defined outname.. ? 
>Also noticed your script was much slower.
>

The below worked for me.

a=rand(100,20);
for i=1:20;
  plot(a(:,i));
  drawnow;
  outname=['figure_' num2str(i) '.png'];
  print('-dpng', outname);
  close;
end

My case drawnow is a point.

It force plot to draw into a plot window.
In for loop plot is not necessarily draw in every loop.

Tatsuro