Homework%203%20Solutions - EG 10112 Introduction to Engineering Homework 3 Due in Learning Center week of Reading Brockman 12.3-12.5(no user-defined

Homework%203%20Solutions - EG 10112 Introduction to...

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EG 10112: Introduction to Engineering Homework 3 Due in Learning Center, week of February 13, 2012 Reading: Brockman 12.3-12.5 (no user-defined functions, yet) 1. If a program contains the following line, for what values of iv will the loop run? for iv=3:4:17 The loop will run for the values of iv = 3, 7, 11, 15, and then end (it starts at 3, increments by 4, and stops when it reaches 17). 2. List all possible values for num , below, in which the following program will display “None of the above.” num=randi([1,100]); if num>0 && num<5 x=1; elseif num>10 && num<70 x=2; elseif num>85 x=3; else x= 'None of the above' ; end disp(x) The program will display None of the Above when n=5-10 (including the values of 5 and 10) or when n=70-85 (including the values of 70 and 85). All other values from 1 to 100 would fit in the confines of the problem. 3. piecewise.m Write a program, piecewise.m , that calculates the value of the piecewise function p(x) defined below for an input x . The function is defined in three parts: otherwise defined not 10 4 if 5 2 4 1 if 3 1 1 5 if 4 2 ) ( 2 x x x x x x x p The program should get the value of the argument x from the user with an input command. The display both the input value and function value in a nicely formatted way.
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% User indicates an input and the then result will be displayed % Clear command window and workspace clear clc x = input( 'Please enter a value: ' ); % Create a logical variable to change between true and false if user % chooses an undefined x. notDefined = false; % Determin p % Determine the function values using a if/elseif/else structure if x>=-5 && x<-1 p=2*x-4; elseif x>=-1 && x<4 p=(x-1/3)^2; elseif x>=4 && x<10 p=-2*x+5; else notDefined=true; end % Display results disp([ 'For the input value x = ' num2str(x), ',' ]); if notDefined disp( 'p(x) is not defined.' ); else disp([ 'p(x) = ' , num2str(p), '.' ]); end OUTPUTS: Please enter a value: 7 For the input value x = 7, p(x) = -9.
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