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Lecture_06_horowitz

# Lecture_06_horowitz - 1 E7 INTRODUCTION TO COMPUTER E7...

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E7 L6 1 E7: INTRODUCTION TO COMPUTER E7: INTRODUCTION TO COMPUTER PROGRAMMING FOR SCIENTISTS AND PROGRAMMING FOR SCIENTISTS AND ENGINEERS ENGINEERS Lecture Outline The concept of a function MATLAB functions User defined functions Copyright 2007, Horowitz, Packard. This work is licensed under the Creative Commons Attribution-Share Alike License. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/2.0/ or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.

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Professor Horowitz won’t hold office hours tomorrow (needs to attend a research meeting) 3 handouts today Download assignment 3 from bspace!!! Ken will also e-mail E7 L6 2
E7 L6 3 The concept of a function A rule that assigns to each value of the input , a corresponding output value. Symbolically: { } { } 1 2 1 2 , ,..., ( , ,..., ) n m y y y x x x = FUNCTION input output

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E7 L6 4 The concept of a function Pictorially: Input/output data can be of various types, e.g., numbers, strings, arrays, etc. x 1 x 2 x n y 1 y 2 y m FUNCTION . . . .
E7 L6 5 FUNCTIONS in programming FUNCTIONS in programming A set of commands that execute a “task” that can be reuse in several instances. These commands are written as a function Functions are use to break down a large task into a collection of smaller tasks. Functions are also called subroutines, methods , etc.

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E7 L6 6 MATLAB functions MATLAB contains a number of useful functions, Simple mathematical functions (e.g., sin, atan, log, exp, sqrt, abs ) Array functions (e.g., size, sort, sum, max ) String functions (e.g., strmatch, upper ) Cell functions (e.g., celldisp, cellplot ) Structure functions (e.g., fieldnames, rmfield )
E7 L6 7 MATLAB functions MATLAB functions Existing MATLAB functions are distinguished into two categories: Built-in functions implemented in a programming language other than Matlab (C or assembly language). Matlab-programmed functions Written as m-files The type command displays the content of an m-file.

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E7 L6 8 Examples of type outputs Examples of type outputs Built-in function:
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