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Import.
| author | Daniele Nicolodi <nicolodi@science.unitn.it> |
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| date | Wed, 23 Nov 2011 19:22:13 +0100 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/m-toolbox/html_help/help/ug/ltpda_training_topic_1_4.html Wed Nov 23 19:22:13 2011 +0100 @@ -0,0 +1,144 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" + "http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd"> + +<html lang="en"> +<head> + <meta name="generator" content= + "HTML Tidy for Mac OS X (vers 1st December 2004), see www.w3.org"> + <meta http-equiv="Content-Type" content= + "text/html; charset=us-ascii"> + + <title>Basic math with AOs (LTPDA Toolbox)</title> + <link rel="stylesheet" href="docstyle.css" type="text/css"> + <meta name="generator" content="DocBook XSL Stylesheets V1.52.2"> + <meta name="description" content= + "Presents an overview of the features, system requirements, and starting the toolbox."> + </head> + +<body> + <a name="top_of_page" id="top_of_page"></a> + + <p style="font-size:1px;"> </p> + + <table class="nav" summary="Navigation aid" border="0" width= + "100%" cellpadding="0" cellspacing="0"> + <tr> + <td valign="baseline"><b>LTPDA Toolbox</b></td><td><a href="../helptoc.html">contents</a></td> + + <td valign="baseline" align="right"><a href= + "ltpda_training_topic_1_3.html"><img src="b_prev.gif" border="0" align= + "bottom" alt="Making a time-series AO"></a> <a href= + "ltpda_training_topic_1_5.html"><img src="b_next.gif" border="0" align= + "bottom" alt="Saving and loading AOs"></a></td> + </tr> + </table> + + <h1 class="title"><a name="f3-12899" id="f3-12899"></a>Basic math with AOs</h1> + <hr> + + <p> + <p> + Most of the basic math operations supported by MATLAB have been implemented + as AO class methods. For example, suppose you want to add two AOs together, then you can do +</p> +<div class="fragment"><pre> + a = ao(1); + b = ao(2); + c = a+b + plot(c.hist) +</pre></div> +<p> + <i>Note: the units of the two AOs for addition and subtraction must be the same. You can't + add apples to oranges, but you can add dimensionless (empty units) to oranges.</i> +</p> +<p> + Some of the standard operators can act as modifiers. For example, if you want to square an AO: +</p> +<div class="fragment"><pre> + a = ao(2); + a.^2 +</pre></div> +<p> + will do the job. +</p> +<p> + The operators follow MATLAB rules whenever possible. So if you want to add + a single AO to a vector of AOs, you can. However, if you want to add two + vectors of AOs together, the two vectors must contain the same number of AOs. + For example, +</p> +<div class="fragment"><pre> + a = [ao(1) ao(2) ao(3)]; + b = ao(4); + c = a + b +</pre></div> +<p> + will work fine and result in <tt>b</tt> being added to each element of <tt>a</tt>. However, +</p> +<div class="fragment"><pre> + a = [ao(1) ao(2) ao(3)]; + b = [ao(4) ao(5)]; + c = a + b +</pre></div> +<p> + will give an error. +</p> +<p> + You can do all of this on the workbench as well, of course. +</p> +<p> + Try the following: + <ol> + <li>Start up the workbench, and/or open a new pipeline</li> + <li>Drag an <tt>ao</tt> constructor block to the canvas</li> + <li>Set the AO block to be constructed "From XY Values"</li> + <li>Duplicate the block two more times (<tt>ctrl/cmd-d</tt>)</li> + <li>Enter a number for the sampling ferquency <tt>fs</tt></li> + <li>Enter a vector the same length for the <tt>y</tt> value of each block</li> + <li>Drag a <tt>plus</tt> block to the canvas</li> + <li>You'll see that by default the "plus" block has two inputs. To add another input, + right-click on the block and choose "Add input" from the context menu</li> + <li>Connect each AO block to the plus block. The easiest way to do that is to + select the AO block (source) and then <tt>ctrl+left-click</tt> (<tt>cmd+left-click</tt> on Mac systems) on the plus (destination) block. You + can also drag a pipe from the output terminal of the AO blocks to the input terminals of the plus block + if you want to be explicit about which input ports are used.</li> + <li>Add an <tt>iplot</tt> block to the canvas and connect the output of the <tt>plus</tt> block to the input + of the <tt>iplot</tt> block. You should now have a pipeline something like:<br> + <img src="images/ltpda_training_1/topic1/ao_plus_eg.png" alt="AO plus example" border="1"> + </li> + <li>Execute the pipeline and you should see a plot something like the one below, depending on what + data values you gave to the <tt>ao</tt> constructors + <img src="images/ltpda_training_1/topic1/ao_plus_plot.png" alt="AO plus plot" border="1"></li> + </ol> +</p> + + + + + + </p> + + <br> + <br> + <table class="nav" summary="Navigation aid" border="0" width= + "100%" cellpadding="0" cellspacing="0"> + <tr valign="top"> + <td align="left" width="20"><a href="ltpda_training_topic_1_3.html"><img src= + "b_prev.gif" border="0" align="bottom" alt= + "Making a time-series AO"></a> </td> + + <td align="left">Making a time-series AO</td> + + <td> </td> + + <td align="right">Saving and loading AOs</td> + + <td align="right" width="20"><a href= + "ltpda_training_topic_1_5.html"><img src="b_next.gif" border="0" align= + "bottom" alt="Saving and loading AOs"></a></td> + </tr> + </table><br> + + <p class="copy">©LTP Team</p> +</body> +</html>