ResultsTable questions

[Michael Doube]

Hi all

I am writing a method that will collate results into the same row of a
result table when running different plugins on the same image, so each
image will get 1 row with results from different plugins in the cells.

1. Is there a value other than 0 that represents an empty cell? At the
moment, if no value is entered for a cell when another cell in the same
row is updated, 0 is shown in the table.  This is not the same as 'no
data' - null seems more appropriate.

2. I can create a new results table and call it "Measurements" like this:
ResultsTable rt = new ResultsTable();
rt.show("Measurements");
But how do I check whether the "Measurements" table already exists, and
write to it instead of overwriting it with a new instance each time?
This is trivial if I use the system Results table,
ResultsTable rt = ResultsTable.getResultsTable();
but I want to leave the "Results" table free for other stuff and have a
dedicated table for my plugins' results.

Cheers

Mike

[Michael Schmid]

Hi Mike,

(1) you can't set the value of a cell to null, but you can set it to  
Double.NaN (not a number) to signify an empty cell. Use Double.isNaN
(x) to test for it.

(2) did you try WindowManager.getFrame("Measurements")? It should  
tell you whether a non-image frame with this title has been added to  
the list of windows.

Michael
________________________________________________________________

On 3 Jun 2009, at 19:52, Michael Doube wrote:

> Hi all
>
> I am writing a method that will collate results into the same row  
> of a result table when running different plugins on the same image,  
> so each image will get 1 row with results from different plugins in  
> the cells.
>
> 1. Is there a value other than 0 that represents an empty cell? At  
> the moment, if no value is entered for a cell when another cell in  
> the same row is updated, 0 is shown in the table.  This is not the  
> same as 'no data' - null seems more appropriate.
>
> 2. I can create a new results table and call it "Measurements" like  
> this:
> ResultsTable rt = new ResultsTable();
> rt.show("Measurements");
> But how do I check whether the "Measurements" table already exists,  
> and write to it instead of overwriting it with a new instance each  
> time? This is trivial if I use the system Results table,
> ResultsTable rt = ResultsTable.getResultsTable();
> but I want to leave the "Results" table free for other stuff and  
> have a dedicated table for my plugins' results.
>
> Cheers
>
> Mike

[dscho]

Hi,

On Wed, 3 Jun 2009, Michael Doube wrote:

> 1. Is there a value other than 0 that represents an empty cell? At the
>    moment, if no value is entered for a cell when another cell in the
>    same row is updated, 0 is shown in the table.  This is not the same
>    as 'no data' - null seems more appropriate.

AFAICT no, there is no way... ResultsTable can only contain doubles, and
there is no null double...

> 2. I can create a new results table and call it "Measurements" like
>    this:  ResultsTable rt = new ResultsTable();  
>    rt.show("Measurements");  But how do I check whether the
>    "Measurements" table already exists, and write to it instead of
>    overwriting it with a new instance each time? This is trivial if I
>    use the system Results table, ResultsTable rt =
>    ResultsTable.getResultsTable();  but I want to leave the "Results"
>    table free for other stuff and have a dedicated table for my plugins'
>    results.

The only way I could imagine to do this is to look through
WindowManager.getNonImageWindows().

But if the table could only be constructed by _your_ code, you could make
it a singleton... (i.e. private static ResultsTable measurements; [...] if
(measurements == null) [...])

Ciao,
Dscho

[Fernando Sales]

Michael,

i was writing my reply and Johannes has just described what i was
thinking...
Try to use the Singleton Pattern (http://www.javacamp.org/designPattern/).
This is a "standard"  solution to the problem of (writing / accessing) a
(file / database / ... ) from multiple sources.
The main idea is to develop a private method for creation of a unique
ResultsTable.

Best Regards,
Fernando

On Wed, Jun 3, 2009 at 6:17 PM, Johannes Schindelin <
[hidden email]> wrote:

> Hi,
>
> On Wed, 3 Jun 2009, Michael Doube wrote:
>
> > 1. Is there a value other than 0 that represents an empty cell? At the
> >    moment, if no value is entered for a cell when another cell in the
> >    same row is updated, 0 is shown in the table.  This is not the same
> >    as 'no data' - null seems more appropriate.
>
> AFAICT no, there is no way... ResultsTable can only contain doubles, and
> there is no null double...
>
> > 2. I can create a new results table and call it "Measurements" like
> >    this:  ResultsTable rt = new ResultsTable();
> >    rt.show("Measurements");  But how do I check whether the
> >    "Measurements" table already exists, and write to it instead of
> >    overwriting it with a new instance each time? This is trivial if I
> >    use the system Results table, ResultsTable rt =
> >    ResultsTable.getResultsTable();  but I want to leave the "Results"
> >    table free for other stuff and have a dedicated table for my plugins'
> >    results.
>
> The only way I could imagine to do this is to look through
> WindowManager.getNonImageWindows().
>
> But if the table could only be constructed by _your_ code, you could make
> it a singleton... (i.e. private static ResultsTable measurements; [...] if
> (measurements == null) [...])
>
> Ciao,
> Dscho
>

--
**************************************************
Fernando José Ribeiro Sales
**************************************************
Email: [hidden email]
Tel: [phone]
**************************************************

[Frederic V. Hessman]

You're welcome to check out the MeasurementTable class in my astroj  
plugin package, which gives you that kind of functionality and is  
compatible with normal ResultsTable: http://www.astro.physik.uni-goettingen.de/~hessman/ImageJ/Astronomy/docs/

Rick

On 3 Jun 2009, at 19:52, Michael Doube wrote:

> Hi all
>
> I am writing a method that will collate results into the same row of  
> a result table when running different plugins on the same image, so  
> each image will get 1 row with results from different plugins in the  
> cells.
>
> 1. Is there a value other than 0 that represents an empty cell? At  
> the moment, if no value is entered for a cell when another cell in  
> the same row is updated, 0 is shown in the table.  This is not the  
> same as 'no data' - null seems more appropriate.
>
> 2. I can create a new results table and call it "Measurements" like  
> this:
> ResultsTable rt = new ResultsTable();
> rt.show("Measurements");
> But how do I check whether the "Measurements" table already exists,  
> and write to it instead of overwriting it with a new instance each  
> time? This is trivial if I use the system Results table,
> ResultsTable rt = ResultsTable.getResultsTable();
> but I want to leave the "Results" table free for other stuff and  
> have a dedicated table for my plugins' results.
>
> Cheers
>
> Mike

[dscho]

Hi,

On Thu, 4 Jun 2009, Frederic Hessman wrote:

> You're welcome to check out the MeasurementTable class in my astroj
> plugin package, which gives you that kind of functionality and is
> compatible with normal ResultsTable:
> http://www.astro.physik.uni-goettingen.de/~hessman/ImageJ/Astronomy/docs/

On the same website you mention a wish for an Overlay class that can be
used by other plugins.  Does this meet your needs?

        http://www.masny.dk/imagej/overlay/index.php

Ciao,
Dscho

[Michael Doube]

Thanks everyone for your suggestions overnight; I particularly liked
this from javacamp.org:

"...not only will you be smarter but will you sound a lot smarter, too".

Mike

Fernando Sales wrote:

> Michael,
>
> i was writing my reply and Johannes has just described what i was
> thinking...
> Try to use the Singleton Pattern (http://www.javacamp.org/designPattern/).
> This is a "standard"  solution to the problem of (writing / accessing) a
> (file / database / ... ) from multiple sources.
> The main idea is to develop a private method for creation of a unique
> ResultsTable.
>
> Best Regards,
> Fernando
>
> On Wed, Jun 3, 2009 at 6:17 PM, Johannes Schindelin <
> [hidden email]> wrote:
>
>> Hi,
>>
>> On Wed, 3 Jun 2009, Michael Doube wrote:
>>
>>> 1. Is there a value other than 0 that represents an empty cell? At the
>>>    moment, if no value is entered for a cell when another cell in the
>>>    same row is updated, 0 is shown in the table.  This is not the same
>>>    as 'no data' - null seems more appropriate.
>> AFAICT no, there is no way... ResultsTable can only contain doubles, and
>> there is no null double...
>>
>>> 2. I can create a new results table and call it "Measurements" like
>>>    this:  ResultsTable rt = new ResultsTable();
>>>    rt.show("Measurements");  But how do I check whether the
>>>    "Measurements" table already exists, and write to it instead of
>>>    overwriting it with a new instance each time? This is trivial if I
>>>    use the system Results table, ResultsTable rt =
>>>    ResultsTable.getResultsTable();  but I want to leave the "Results"
>>>    table free for other stuff and have a dedicated table for my plugins'
>>>    results.
>> The only way I could imagine to do this is to look through
>> WindowManager.getNonImageWindows().
>>
>> But if the table could only be constructed by _your_ code, you could make
>> it a singleton... (i.e. private static ResultsTable measurements; [...] if
>> (measurements == null) [...])
>>
>> Ciao,
>> Dscho
>>
>
>
>

--
Dr Michael Doube  BPhil BVSc PhD MRCVS
Research Associate
Department of Bioengineering
Imperial College London
South Kensington Campus
London  SW7 2AZ
United Kingdom

Phone: [phone]
Fax: [phone]