128 lines
5.2 KiB
HTML
128 lines
5.2 KiB
HTML
<html lang="zh">
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<head>
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<link rel="stylesheet" href="visualPages.css">
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<title> Data Structure Visualization </title><meta charset="UTF-8">
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<link rel="shortcut icon" href="favicon.ico" />
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</head>
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<body>
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<div class="container">
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<div class="header"><h1>Data Structure Visualizations</h1> </div>
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<div class="menu">
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<ul>
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<li> <a href="about.html">About</a> </li>
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<li> <a href="Algorithms.html">Algorithms</a> </li>
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<li> <a href="faq.html"> F.A.Q </a> </li>
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<li> <a href="bugfeature.html"> Known Bugs /<br> Feature Requests </a> </li>
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<li> <a href="java/visualization.html"> Java Version </a> </li>
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<li> <a href="flash.html">Flash Version </a> </li>
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<li> <a href="source.html">Create Your Own /<br> Source Code</a> </li>
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<li> <a href="contact.html"> Contact </a> </li>
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</ul>
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<br> <br>
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<div class="about">
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<a href="http://www.cs.usfca.edu/galles"> David Galles </a> <br>
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<a href="http://www.cs.usfca.edu"> Computer Science </a> <br>
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<a href="http://www.usfca.edu"> University of San Francisco </a>
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</div>
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</div>
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<div class="content">
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<h1> Frequently Asked Questions </h1>
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<ol>
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<li> Sometimes when I insert a element into a BST or other ordered data structure, I get strange behavior -- "-2" seems to be <em>smaller</em>
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than "-3". What's going on? </li>
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<ul>
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<li> We use string comparisons for everything, so "-2" is in fact less than "-3" lexicographically.
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We tried to mitigate confusion somewhat by automatically converting positive integers into equivalent numbers with leading zeroes,
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so that positive integers would always be ordered as expected (though negative numbers are alas off).
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It turns out that if you are trying to sort a group of any strings, using a mixed comparison strategy gets confusing
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fast -- how should 10.4 compare to 3.1.2? What about 3A -- is that a string or a hexidecimal number?
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What about AF? Should BC come before or after AFF? We made the executive decision to just do string comparisons everywhere
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for consitency.
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</ul>
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<li> How can I get this to work on my cellphone, which has a very small screen?</li>
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<ul>
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<li>
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If you change the canvas size to something that seems reasonable for your device, we will use a cookie to remember your
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preferred size. Then reload the page, and you should be set! Cell Phones are a little tricky, since their screens are so
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small -- the iPhone 4 seems to work well for most algorithms, with a width of 500 and a height of 300 (though the
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sorting algorithms really require a width of 900 to see everything, and graph algorithms need a width of 1000 to see
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everything.) With iOS devices, you can set the canvas size to a larger value than can be dipslayed at once, though
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you will then need to do a bit of zooming in/out or scrolling.
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</li>
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</ul>
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<li> Wait ... you are using cookies? </li>
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<ul>
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<li>
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Only for remembering your preferred width/height/speed. Everything will still work if you disable cookies, you just
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won't get the extra convienence of having the exact right size for your device. We aren't doing tracking of any kind.
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</li>
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</ul>
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<li> I think I've found a bug ...
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<ul>
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<li> Please email me any bug reports, at galles <at> usfca <dot> edu. The more specific, the better (that is,
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excatly what sequence of operations lead to the undesired behavior).
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</ul>
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<li> Can I use these materials in my classes?
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<ul>
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<li> Certainly! I'd prefer that you just link to my pages rather than cache anything locally so that your
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students will get the most up-to-date version of everything. If you do use this in your class, please drop me
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a line to let me know about it, I'm curious to see who else will find this useful.
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</ul>
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<li> Can I use this material as a base for my own visualizations? </li>
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<ul>
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<li> Yes! See the <a href = "source.html">source code</a> page for a simple tutorial and a tarball with everything you need.
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Note that updates to the source code release are not made as quickly as updates to the visualziations themselves,
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so not all of the visualziations may be in the tarball at any given time. I plan to update the source code at
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least once a month or so, so it shouldn't get too far out of date. If you do use my code,
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please leave in the copyright information at the beginning of each source file, and put a link to these pages from the page
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where your visualizations are located. If you create something really cool, let me know and I can link to it.
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</li>
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</ul>
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<li> What's next? </li>
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<ul>
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<li> Converting the remainder of the java-only visualziations to javascript (only Huffman Coding and lists left!) </li>
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<li> Adding a suite of simple recursion visualziations (factorial, reversing a list, generic tree operations, etc).
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Similar to the <a href = "DPFib.html">Dynamic Programming: Fibonacci</a> visualziation, but with some more detail
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(contents of the call stack, etc)</li>
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<li> Adding more Dynamic Programming visualziations </li>
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<li> Adding visualzations of translations and rotations of simple objects (in 2D, or 3D if I'm feeling ambitious).
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Mostly because those visualziations would be handy for my Game Engineering classes.</li>
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</ul>
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</ol>
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<br>
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<br>
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<br>
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</div>
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<div class="footer">Copyright 2011 <a href = "http://www.cs.usfca.edu/galles">David Galles </a> </div>
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</div>
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</body>
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</html>
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