69 lines
2.6 KiB
HTML
69 lines
2.6 KiB
HTML
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<!-- saved from url=(0014)about:internet -->
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<html>
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<meta http-equiv="X-UA-Compatible" content="IE=9" />
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<head>
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<title>Graphing Calculator: Evaluating expressions</title>
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<link href="style.css" rel="stylesheet" type="text/css" />
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</head>
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<body>
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<h1>Graphing Calculator: Evaluating expressions</h1>
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<div class="section" style="background-color: #FFFFE8; font-size:10pt; padding-bottom:1px;">
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<h2>Note</h2>
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<p>This article describes how to use the expression evaluator window. If you would like to learn how type an expression, you should go to <a href="language.htm">this article</a> instead.</p>
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</div>
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<div class="section">
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<h2>Content</h2>
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<ul>
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<li><a href="#intro">Introduction</a></li>
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<li><a href="#start">Getting started</a></li>
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<li><a href="#vars">Variables</a></li>
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</ul>
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</div>
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<div class="section">
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<a name="intro"></a>
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<h2>Introduction</h2>
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<p>The <strong>Expression evaluator</strong> is a tool within the <strong>Graphing Calculator</strong> which can compute the result of a typed mathematical expression.</p>
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</div>
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<div class="section">
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<a name="start"></a>
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<h2>Getting started</h2>
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<p>To evaluate an expression, follow the following steps:</p>
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<strong>Step 1:</strong> In the application window, click the <em>Evaluate</em> button. <br />
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<strong>Step 2:</strong> Type an expression in the <em>Input expression</em> field. <br />
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<strong>Step 3:</strong> Add variables to the variable list if needed.<br />
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<strong>Step 4:</strong> Click <em>Evaluate</em>. <br />
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<p>Example: </p>
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<img src="img/eval0.png" style="margin-top: -10px;" />
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</div>
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<div class="section">
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<a name="vars"></a>
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<h2>Variables</h2>
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<p>A description of what variables are, and why they are useful can be found in the <a href="language.htm#vars">language article</a>.</p>
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<p>To use variables in the evaluator window, you need to type the name in the <em>Name</em> field, the value in the <em>Value</em> field, and click <em>Add</em>. If a variable with the same name already exists, you will be prompted if you want to replace the old value.</p>
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<p>The value of a variable can also be an expression, it doesn't have to be a simple number.</p>
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<img src="img/eval1.png" style="margin-top: -10px;" />
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<p>To remove a variable from the list, or edit it, simply right click, and a menu will appear.</p>
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</div>
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<div class="footer">
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Software created by Chibici Tiberiu.
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Contact: <a href="mailto:chibicitiberiu@gmail.com">chibicitiberiu@gmail.com</a>
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</div>
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</body>
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</html>
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