MATLAB Central Newsreader - grouping plot handles?

grouping plot handles?

David Doria — Wed, 09 Apr 2008 14:08:02 -0400

I would like to do this
%group 1
a=plot(0,1,'o');
b=plot(1,1,'ro');

%group 2
c=plot(1,2,'go');

delete(group 1)

how would I do that?

Thanks

Dave

Re: grouping plot handles?

helper — Wed, 09 Apr 2008 14:48:03 -0400

"David Doria" <daviddoria@gmail.com> wrote in message
<ftiik2$7ni$1@fred.mathworks.com>...
> I would like to do this
> %group 1
> a=plot(0,1,'o');
> b=plot(1,1,'ro');
>
> %group 2
> c=plot(1,2,'go');
>
> delete(group 1)
>
> how would I do that?
>
> Thanks
>
> Dave

Try this:

%group 1
group{1}(1) = plot(0,1,'o');
group{1}(2) = plot(1,1,'ro');

%group 2
group{2}(1) = plot(1,2,'go');

delete(group{1})

You could used "group1" and "group2" in place of "group{1}"
and "group{2}". However, I placed each group into a
different cell of a cell array so it will be easy for you
to create (for example) group{142} if you need to.

Re: grouping plot handles?

David Doria — Wed, 09 Apr 2008 15:38:02 -0400

ah cool , i didn't realize you could delete an array of
function handles.

Heres another problem i'm having:
in a for loop, i have this statement:

if ismember('hNewCam', who) == 1
delete(hNewCam);
end

which is just to prevent the handle from being delete the
first time through the loop (since it doesn't exist yet).
The thing is, I get this error:

??? Error using ==> delete
Invalid handle object.

but if I put a breakpoint at the beginning of the loop and
delete(hNewCam) manually, it works fine!!??

any thoughts?

David
"helper " <spamless@nospam.com> wrote in message
<ftikv3$h37$1@fred.mathworks.com>...
> "David Doria" <daviddoria@gmail.com> wrote in message
> <ftiik2$7ni$1@fred.mathworks.com>...
> > I would like to do this
> > %group 1
> > a=plot(0,1,'o');
> > b=plot(1,1,'ro');
> >
> > %group 2
> > c=plot(1,2,'go');
> >
> > delete(group 1)
> >
> > how would I do that?
> >
> > Thanks
> >
> > Dave
>
> Try this:
>
> %group 1
> group{1}(1) = plot(0,1,'o');
> group{1}(2) = plot(1,1,'ro');
>
> %group 2
> group{2}(1) = plot(1,2,'go');
>
> delete(group{1})
>
> You could used "group1" and "group2" in place of "group{1}"
> and "group{2}". However, I placed each group into a
> different cell of a cell array so it will be easy for you
> to create (for example) group{142} if you need to.

Re: grouping plot handles?

helper — Wed, 09 Apr 2008 15:50:19 -0400

>
> Heres another problem i'm having:
> in a for loop, i have this statement:
>
> if ismember('hNewCam', who) == 1
> delete(hNewCam);
> end
>
> which is just to prevent the handle from being delete the
> first time through the loop (since it doesn't exist yet).
> The thing is, I get this error:
>
> ??? Error using ==> delete
> Invalid handle object.
>
> but if I put a breakpoint at the beginning of the loop and
> delete(hNewCam) manually, it works fine!!??
>

Try it this way. Initialize hNewCam before the loop to be
empty:

hNewCam = [];

Then, within the loop, use this construct:

if ishandle(hNewCam)
delete(hNewCam)
end

Re: grouping plot handles?

roberson@ibd.nrc-cnrc.gc.ca (Walter Roberson) — Wed, 09 Apr 2008 16:01:28 -0400

In article <ftiik2$7ni$1@fred.mathworks.com>,
David Doria <daviddoria@gmail.com> wrote:
>I would like to do this
>%group 1
>a=plot(0,1,'o');
>b=plot(1,1,'ro');

As you did not specify axes to plot(), both of them are going to
use the current axis (gca). Unless 'hold on' is in effect, that is
going to result in the second plot, 'b', replacing the first one, and
the handles in 'a' would become invalid.

>%group 2
>c=plot(1,2,'go');

Similarily, unless 'hold on', that would delete the plot 'b'.

>delete(group 1)

>how would I do that?

Unless your code is a bit different than what you show here, you
would not need to.
--
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