Chapter 4: Programming in Matlab - College of the Redwoods

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$Math 50A February 18, 2011 Quiz #10 Name: David Arnold ...$

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374 Chapter 4 Programming in Matlab Execute the cell and then state what happens and why. 4. Let’s try an approach different to the attempt in Exercise 3. Open the editor, enter the following lines, and save the file as simpleInterest2.m. function I=simpleInterest2 global P R T I=P*R*T; Add the following cell to VariableScope.m. %% Exercise #4 clc clear all global P R T P=1000; R=0.06; T=10; I=simpleInterest2; fprintf(’Simple interest gained is %.2f.\n’,I) Execute the cell and state the resulting output. Explain the difference between the result in Exercise 3 and the current exercise. 5. Enter the following lines in the editor and save the file as clearFunction. function clearFunction clear all Add the following cell to VariableScope.m. %% Exercise #5 clc clear all P=1000; R=0.06; T=10; clearFunction; whos
Section 4.4 Variable Scope in Matlab 375 Execute the cell and explain the resulting output. Why do the variables P , R, and T still remain in the base workspace? Didn’t we clear them with clearFunction? 6. Enter the following lines in the editor and save the file as simpleInterest3.m. function I=simpleInterest3 P=5000; R=0.10; T=8; I=P*R*T Add the following cell to VariableScope.m. %% Exercise #6 clc clear all P=1000; R=0.06; T=10; dbstop simpleInterest3 5 simpleInterest3 whos The command dbstop simpleInterest3 5 puts a breakpoint at line 5 of the function simpleInterest3. When the script executes the function on the next line, the Matlab Debugger halts execution at line 5 of the function simpleInterest3 and displays the debug prompt and the current line. 5 I=P*R*T K>> To see where you are, enter the following command at the debug prompt. K>> dbstack > In simpleInterest3 at 5 This tells us we are in simpleInterest3 at line 5. Note that the variables P , R, and T are declared in lines previous to line 5. Examine their contents in the workspace of function simpleInterest3.
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4 Programming In Matlab In this cha
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Section 4.1 Logical Arrays 261 4.1
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