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Unformatted text preview: HOW MATHCAD WORKS Think of the Mathcad screen as a piece of paper on a scratchpad  you can jot down calculations anywhere you want. Unlike a paper scratchpad, though, Mathcad knows how to do calculations, how to show equations in typeset format, and how to show graphs. To see how easy it is to use Mathcad, click the mouse button anywhere there is free space in this window. You will see a small crosshair when you have clicked in some free space. Now type the following (without spaces): 15  8 / 104.5 = Notice that: Mathcad shows the equation in typeset form. Mathcad is smart enough to know that the division takes precedence over the subtraction. Mathcad immediately calculates the answer  in this case, 14.923 (to 3 decimal places). 1 HOW TO DEFINE VARIABLES Mathcad reads and calculates equations from top to bottom and from left to right on the page, just as you do. To define a variable, you use the colon key. For example, try this: Click anywhere in the free space below and then type the following: t : 10 (t colon 10) You've just defined a varible t to be 10. (Mathcad uses := to mean "is defined as."). Now, click anywhere in the free space below and type: t ^ 2 = (t caret 2 equals) Mathcad calculates the answer. Anywhere below or to the right of a definition of a variable, you can use the variable in a formula. Try experimenting with some other formulas below: \ t = (backslash t equals) t * 1 / 3 = (t star 1 slash 3 equals) 2 ENTERING & EDITING EQUATIONS For example, try this: Click in the space below or in your Mathcad window and type: 3+10^2.1[Space]/4.5= 3 10 2.1 4 .5 + 30 .976 = Notice that: Equations are shown in typical algebraic format. Calculations take place as soon as you leave the equation. Now, try editing the following equation: 1 1 2 1 10 + 1 .667 = Click on any spot in the equation. Use the up/down/left/right arrow keys to select different expressions with the blue selection box. Once an expression is selected, try typing an operator ( + ,  , * , or / ). Try this: Select any portion of the expression, then click on the square root button (on palette #1 at the left of the window). To recalculate, press [F9] . Mathcad equations are easy to enter and edit. 3 a HOW TO EDIT EQUATIONS Here's how to edit an equation that's already on the screen: Click on the part of the equation you want to edit. You can edit names and numbers like ordinary text. To add operators (like +, , * , / ) to an equation, use the arrow keys to SELECT the part of the equation you're adding to. Mathcad shows a box around the selected part....
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This note was uploaded on 02/04/2011 for the course PB HLTH 140 taught by Professor Tarter during the Fall '10 term at University of California, Berkeley.
 Fall '10
 Tarter

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