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Lecture 4: Input and output

To print a variable in your display on the command window, its place must be indicted by % in the format-string followed by the format of presentation (d, f, e, g). %d: integer notation %f: fixed point (decimal) notation %e: exponential notation %g: whichever is shorter, %f or %e | Lecture 4 Input and Output input fprintf © 2007 Daniel Valentine. All rights reserved. Published by Elsevier. Input Some options: Assign values to variables in a command line using the equal ( = ) sign. Use the input function for interactive assignment of values to some of the variables within your computer program. Input function General format: The display in the Command window: Type a value after the displayed prompt; the variable now has been assigned the value that was entered. variable = input('Please enter a value: ') Please enter a value: Area of a circle: Type this into an m-file: Execute and see this display in Command Window: Hands on Please enter the radius: 5.2 radius = 5.2000 area = 84.9487 Hands on Free falling object: Type this into an m-file: Execute: See this display in Command Window: Please enter the initial height (in meters): 25 Please enter the time the object was in the air (in seconds): 3 Please enter the initial velocity (in meters): 5 height_f = 84.1450 Input strings of text General format: The display in the Command window: This is used when the input is a string (e.g., names, months, etc.). The variable, in this case, is a ‘char’ class (or type). string = input('Please enter your name: ', 's') Please enter your name: The display variables: You can display the value of a variable in different ways. Typing “variable =” in the command window Using the fprintf command: Type into an m-file: Executing it displays in the Command Window: Output options x = 500 The value of x is 500. fprintf() The fprintf() command is one way to display the value of a variable with a label. General format: MATLAB code: fprintf('format-string', variable) Note: You can also use the disp() function to display results. See the help on disp() and the examples in the text. Placeholders in fprintf() To print a variable in your display on the command window, its place must be indicted by % in the format-string followed by the format of . | Lecture 4 Input and Output input fprintf © 2007 Daniel Valentine. All rights reserved. Published by Elsevier. Input Some options: Assign values to variables in a command line using the equal ( = ) sign. Use the input function for interactive assignment of values to some of the variables within your computer program. Input function General format: The display in the Command window: Type a value after the displayed prompt; the variable now has been assigned the value that was entered. variable = input('Please enter a value: ') Please enter a value: Area of a circle: Type this into an m-file: Execute and see this display in Command Window: Hands on Please enter the radius: 5.2 radius = 5.2000 area = 84.9487 Hands on Free falling object: Type this into an m-file: Execute: See this display in Command Window: Please enter the initial height (in meters): 25 Please enter the time the object was in the air (in seconds): 3 Please enter the initial velocity (in meters): 5 .