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From: Stargazer on 23 Jul 2010 01:19
A vector contains handles from a plot. I want to check if this vector contains a handle at a certain position how do I do this?

Would this work?

try
figNr = input('text');
current_plot_handle = plot_handles(figNr);
catch
% If no handle at figNr then display error message.
errmsg = lasterr;
if(strfind(errmsg, 'Error using ==> getPlotHandle'))
disp('This figure does not exist!')
else
disp('An error has occurred!')
disp(errmsg)
end % end if
return %Return to previous function
end % end try-catch

How does the try-catch work?
Does the function return zero values if one use 'return'

How can one connect handles for a figure 4 to its plot, title .. handles?
From: Walter Roberson on 23 Jul 2010 09:30
Stargazer wrote:
> A vector contains handles from a plot. I want to check if this vector contains a handle at a certain position how do I do this?

ishandle()
From: Steven_Lord on 23 Jul 2010 09:31


"Stargazer" <holodeck.novelist(a)gmail.com> wrote in message
news:1606824328.41068.1279876865206.JavaMail.root(a)gallium.mathforum.org...
> A vector contains handles from a plot. I want to check if this vector
> contains a handle at a certain position how do I do this?

I'm not sure what you mean when you ask "a handle at a certain position".
Do you mean you want to check if there is a graphics object with a specific
handle?

> Would this work?

It appears to be syntactically valid. Whether it "works" depends on whether
or not my guess above was correct.

> try
> figNr = input('text');
> current_plot_handle = plot_handles(figNr);
> catch
> % If no handle at figNr then display error message.
> errmsg = lasterr;
> if(strfind(errmsg, 'Error using ==> getPlotHandle'))

Don't do this. If you must branch on the meaning of a particular error,
branch based on the error identifier, not the message. In functions
included with MATLAB or toolboxes, error messages change much more
frequently than error identifiers. One special case of this is if you run
your code on a Windows machine using the Japanese locale -- if the error
message is thrown by a function created by The MathWorks it may be
translated, while the error identifier will not change.

> disp('This figure does not exist!')
> else
> disp('An error has occurred!')
> disp(errmsg)
> end % end if
> return %Return to previous function
> end % end try-catch
>
> How does the try-catch work?

TRY/CATCH blocks are explained in the documentation for the TRY keyword:

doc try

> Does the function return zero values if one use 'return'

Not unless that's what its function declaration line indicates it returns.
The RETURN function causes a normal return to the caller function -- as
though MATLAB had reached the end of the function containing the RETURN.

> How can one connect handles for a figure 4 to its plot, title .. handles?

I don't know what you mean by this question. If you're looking to determine
what axes, plot objects, etc. are in a given figure then you can use FINDOBJ
or FINDALL. If you're looking to determine in which figure an axes, plot
objects, etc. are located use the ANCESTOR function.

--
Steve Lord
slord(a)mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ
To contact Technical Support use the Contact Us link on
http://www.mathworks.com

From: Stargazer on 23 Jul 2010 07:36
I want to store different graphics handles for different figures.

How do I do that in the best way?
From: Walter Roberson on 23 Jul 2010 11:55
Stargazer wrote:
> I want to store different graphics handles for different figures.
>
> How do I do that in the best way?

Which-ever way makes your code clearest will probably be the best way.
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