Lecture 14

Lecture 14 - 14:440:127 Introduction to Computers for...

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Unformatted text preview: 14:440:127 Introduction to Computers for Engineers Notes for Lecture 14- Final Exam OMG! Rutgers University, Fall 2009 Instructor- Blase E. Ur 1 Basics Key Idea 0: The names of m-files and of variables must start with a letter, and can only contain letters, numbers, and the underscore... AND NO SPACES ARE ALLOWED!!!! Key Idea 1: The relational operators are > , >= , < , <= , == , ~= . Notice that those last two operators signify is it equal to and is it UNequal to, respectively. Each of these operators returns either 0 (false) or 1 (true). Key Idea 2: 0 is false. 1 and all other non-zero values are true. Key Idea 3: To connect two or more statements, each of which is true or false, use the logical operators: & (AND) is true only if the statement before it AND the statement after it are both true. | (OR) is true if either the statement before it OR the statement after it is true. ~ (NOT) reverses true and false. ~1 is false, whereas ~0 is true. 2 Conditionals 2.1 If Key Idea 1: An If Statement begins with if(condition) , where the condition evaluates to true or false. If the condition is true, Matlab executes the statements following the if and preceding end . If the condition is not true, Matlab skips those statements. Key Idea 2: If the first condition is not true, you can follow with an else statement. You cant write any condition after else . If the original condition is false, Matlab executes the statements following else . Key Idea 3: If you want to have a bunch of possible courses of action, you can have elseif statements. First, youll have an if condition, then 0 or more elseif conditions, and then you might (or might not) have an else . Going down the list of conditions, Matlab executes the statements following the first condition that is true, and it skips the rest . There is only a single end , all the way at the bottom. 2.2 Switch Key Idea 1: Instead of using if statements, if you have a single variable that takes on a small number of discrete values, you can use switch case . i.e. Menus are excellent times to use switch. Key Idea 2: Start off by typing switch VARIABLEname . Key Idea 3: Then, for each value, type case VALUE i.e case 5 . Dont put something like case x==5 , youve already specified the variable in the switch statement. That would give you an error. 1 Key Idea 4: An if statement uses else to capture all other possibilities. A switch statement uses otherwise . Key Idea 5: To test a couple of possible values in a single case, surround those values by squigly braces, i.e. case {5,6,7} will test if the variable is 5, 6, or 7. x = menu(What do you think about Soulja Boy?, He sucks, He really sucks.); switch x case 1 disp(Correct.) case 2 disp(More correct.) otherwise disp(This will never actually display) end 3 Built-In Math Functions Matlab includes many built-in functions for math operations. Here are a number of the most importantMatlab includes many built-in functions for math operations....
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This note was uploaded on 01/11/2010 for the course 440 127 taught by Professor Blase during the Fall '09 term at Rutgers.

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Lecture 14 - 14:440:127 Introduction to Computers for...

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