Figure identity Question with Loops

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Jason 2017-7-13

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评论： Adam 2017-7-18

Hi, I am creating a figure on each pass in a loop.

On this figure I do several plots (20 of them) but always plot to figure(1) and so don't want to go and replace my code. So obviously all the plots gets overwritten each time the loop is executed

Is it possible to add at the end of the loop a way to change the current figure so that on the next loop, the current one will be figure(1)?

Thanks Jason

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Adam 2017-7-17

It isn't obvious what the problem is with replacing code rather than doing some coding gymnastics to try to force figure(1) to be something different each time. Why can't you just use figure(n) to plot to?

Stephen23 2017-7-17

@Jason: often in these kind of situations it turns out to be better to just go through the code and do it properly: fix it at the source rather than try to bandage it up later.

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Answer 1

Geoff Hayes 2017-7-13

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编辑：Geoff Hayes 2017-7-13

Jason - it may depend upon which version of MATLAB that you are using. In (at least) R2014a, the input parameter to figure is a handle so figure(1) will always refer to the figure whose handle is 1...and so you wouldn't be able to change the handle of a figure so that the newest figure is of handle 1.

In later versions of MATLAB, the input to figure can be a number (see input n) where

figure(n) finds a figure in which the Number property is equal to n, and makes it the current figure. If no figure exists with that property value, MATLAB® creates a new figure and sets its Number property to n.

With that in mind, you might be able to change the Number property of the current figure and then set the Number property of the new figure to 1 so that figure(1) refers to that new figure. My version of MATLAB doesn't support this property, but perhaps someone else can comment on this.

An alternative, would be to pass the handle of your current figure into your function so that it gets updated rather than figure(1).

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Jason 2017-7-17

Thanks Geoff, Im using 2017a so will give it a go. J

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Answer 2

Jan 2017-7-17

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As far as I understand, your code always plot to figure(1). This is a bad idea and changing the code is the best solution. Let Matlab open a new figure for each diagram simply by omitting the number in the figure command. This is clean and easy, while addressing the figure(1) explicitely is the wrong approach, if you definitely do not want the figure(1) to be drawn in. Using some code to advance the figure number magically at the end of the loop, is too indirect to be clean.

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Adam 2017-7-17

Well, in my examples the code itself wouldn't fail, it would just obliterate whatever I happened to already have in figure 457 if I happened to have plotted something else in it previously that I wanted to keep.

But certainly I don't do this in real code, it is just for scripts where I am testing out ideas before I move them into proper code where more often than not I have axes embedded into a GUI rather than launching a random extra figure.

My scripts I often run multiple times in quick succession after some small tweaks so I just tend to end up with loads of figures open. I don't really want to spend time adding extra functionality to those figures though if they'll maybe only be relevant code for a day. And I certainly don't like to add the Matlab newbie's favourite 'close all' to my script! I will often do it on command line, but then it is a choice I make rather than an 'Oops, I didn't want to close that figure over there!'.

Something more robust is definitely advisable for code that is expected to have longevity though. I created a GUIManager class to control figures I launch from a main GUI since Matlab doesn't allow the concept of figures being parented by other figures and thus closing down when their would-be parent closes.

Jan 2017-7-18

编辑：Jan 2017-7-18

在 MATLAB Online 中打开

I prefer to create a vector of figure handles at first and then store it in all figures belonging to the set. Here closing one figure closes all others also - but of course this would be more elegant if the user can choose to close a single figure also:

function main
nFig = 5;
nSub = 8;
FigHList = gobjects(1, nFig);
doInitialize = true;
for k = 1:100
  iFig = mod(k, 5) + 1;
  if ~ishandle(FigHList(iFig))
    FigH           = figure;
    FigHList(iFig) = FigH;
  else
    if doInitialize
       set(FigHList, 'CloseRequestFcn', ...
           {@CloseFigureSet, FigHList});
       doInitialize = false;
    end
    FigH = FigHList(iFig);
  end
  iSub = mod(k, 8) + 1;
  AxesH = subplot(2, 4, iSub, 'Parent', FigH);
    plot(1:10, rand(1, 10), 'Parent', AxesH);
  end
  end
function CloseFigureSet(FigH, EventData, FigHList)
for iFig = 1:numel(FigHList)
  if ishghandle(FigHList(iFig))  % Security check
    delete(FigHList(iFig));
  end
end
end

!JUST FOR DEMONSTRATION! Not Tested!

Instead of the CloseRequestFcn I use a function to close all, close one, print all to PDF or save all in a created folder, lock the figure set from beeing killed by close all, arrange figures horizontally/vertically, etc. I can even give the figure set a unique name and can remove it automatically the next time the script runs. This avoids the ambiguities of using integer numbers to address the figures.

Jason 2017-7-18

在 MATLAB Online 中打开

Thanks Jan & Adam, I will take a look. Just out of interest, Walter suggested this sometime ago to close figures:

fig1h = findall(0,'type','figure','Tag','figure1');  %Keep this open as its the main gUI figure
figh = findall(0,'type','figure');
other_figures = setdiff(figh, fig1h);
delete(other_figures)

Adam 2017-7-18

在 MATLAB Online 中打开

close all

will close all figures that aren't GUIDE figures too.

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Figure identity Question with Loops

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