MATLAB FUNDAMENTALS.pptx - MATLAB FUNDAMENTALS Mark Jayson V Briones ECE,ECT VARIABLES Variables are fundamental to programming In a sense the art of


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Variables are fundamental to programming. In a sense, the art of programming is this: Getting the right values in the right variables at the right time A variable name must comply with the following two rules: ■ It may consist only of the letters a–z, the digits 0–9, and the underscore ( _ ). ■ It must start with a letter. VARIABLES
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The name may be as long as you like, but MATLAB only remembers the first 63 characters (to check this on your version, execute the command namelengthma x in the Command Window of the MATLAB desktop). Examples of valid variable names are r2d2 and pay_day . Examples of invalid names (why?) are pay-day , 2a , name$ , and _2a . VARIABLES
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A variable is created simply by assigning a value to it at the command line or in a program—for example, a = 98 If you attempt to refer to a nonexistent variable you will get the error message ??? Undefined function or variable ... The official MATLAB documentation refers to all variables as arrays , whether they are single-valued (scalars) or multi-valued (vectors or matrices). In other words, a scalar is a 1-by-1 array—an array with a single row and a single column which, of course, is an array of one item. VARIABLES
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MATLAB is case-sensitive , which means it distinguishes between upper- and lowercase letters. Thus, balance , BALANCE and BaLance are three different variables. Case Sensitivity
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Many programmers write variable names in lowercase except for the first letter of the second and subsequent words, if the name consists of more than one word run together. This style is known as camel caps , the uppercase letters looking like a camel’s humps (with a bit of imagination). Examples are camelCaps , milleniumBug , dayOfTheWeek . Some programmers prefer to separate words with underscores. Case Sensitivity
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Command and function names are also case-sensitive. However, note that when you use the command-line help, function names are given in capitals (e.g., CLC) solely to emphasize them. You must not use capitals when running functions and commands! Case Sensitivity
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Another fundamental concept in MATLAB is the workspace . Enter the command clear and then rerun the compound interest program. Now enter the command who . You should see a list of variables as follows: Your variables are: balance interest rate THE WORKSPACE
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All the variables you create during a session remain in the workspace until you clear them. You can use or change their values at any stage during the session.
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