view m-toolbox/html_help/help/ug/collection_objects.html @ 52:daf4eab1a51e
database-connection-manager tip
Fix. Default password should be [] not an empty string
| author |
Daniele Nicolodi <nicolodi@science.unitn.it> |
| date |
Wed, 07 Dec 2011 17:29:47 +0100 (2011-12-07) |
| parents |
f0afece42f48 |
| children |
|
line source
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<h1 class="title"><a name="f3-12899" id="f3-12899"></a>Collection objects</h1>
<hr>
<p>
<p>
Collection objects serve as merely a wrapper for a cell-array of LTPDA User Objects. The point of this is to provide
a way to put together user objects of different classes in to a collection which can be saved/loaded/submitted/retrieved, etc.
</p>
<p>
You can create a <tt>collection</tt> object like:
<div class="fragment"><pre>
>> c = collection
---- collection 1 ----
name: none
num objs: 0
description:
UUID: a339a156-956b-4657-96ef-9ea4feef8101
----------------------
</pre></div>
You can then add objects to the collection by doing:
<div class="fragment"><pre>
>> c.addObjects(ao(1))
M: running ao/ao
M: constructing from values
M: running collection/addObjects
M: running ao/char
---- collection 1 ----
name: none
num objs: 1
01: ao | None/cdata(Ndata=[1x1])
description:
UUID: c1f0200f-ad98-4fd6-beae-2dcdabb33515
----------------------
</pre></div>
or
<div class="fragment"><pre>
>> c.addObjects(pzmodel(1, 10, 100), mfir())
M: running collection/addObjects
M: running ao/char
---- collection 1 ----
name: none
num objs: 3
01: ao | None/cdata(Ndata=[1x1])
02: pzmodel | pzmodel(None)
03: mfir | none(fs=, ntaps=0.00, a=[])
description:
UUID: e7f02380-5650-4788-b819-f7fa7ee50a7d
----------------------
</pre></div>
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<p>
You can then extract objects from the collection using <tt>getObjectAtIndex</tt> or get an array of all
objects of a particular class using <tt>getObjectsOfClass</tt>. Objects can be removed from the collection using
<tt>removeObjectAtIndex</tt>.
</p>
<p>
Since a <tt>collection</tt> object is an LTPDA User Object, it has history tracking capabilities. That means that everytime you
add or remove an object to/from the collection, a history step is added. For example, the history of our collection above looks like:
<img src="images/collection_history.png" alt="Collection history" border="3">
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