9.13: Chapter Exercises
- Page ID
- 136708
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)Exercise 1: Temperature Conversion File
Create a file named tempF.dat that stores the following time and temperature data:
8 55
10 70
12 78
14 76
16 70
18 63
20 55
Write a script named convertTempFileIO.m that reads the data, converts the temperatures from Fahrenheit to Celsius, and saves the time and Celsius temperature values to a new file named tempC.dat.
Exercise 2: Patient Records
Create a file named patientRecord.dat containing:
Grey Chris 166.2
Hall David 143.5
Giovanni Luke 192.4
Cat Donna 215.1
Write a script named readPatient.m that opens the file, checks whether it opened successfully, reads the data into a cell array, displays each patient in a sentence, calculates the average weight, and closes the file.
Exercise 3: Phone Number Formatter
Create a file named phones.dat containing phone numbers written as 10 digits with no spaces or hyphens. Write a script named phoneNumbers.m that uses fgetl to read each phone number and print it in the form 601-242-5932. Your script should check that each number has exactly 10 digits.
Exercise 4: Classmate Information File
Write a script named classmatesInfo.m that prompts the user to enter information for three imaginary classmates: first name, last name, number of siblings, and favorite sport or activity. Use fprintf to store the information in a file named classmates_formatted.dat.
Exercise 5: Patient Data from Excel
Create a spreadsheet named patients.xlsx with columns for last name, first name, age, height in centimeters, and weight in kilograms. Write a script named patientFromExcel.m that reads the spreadsheet, calculates BMI for each patient, finds the average age and average weight, and writes the new information back to the spreadsheet.
Exercise 6: Blood Donor Search
Create a data file named blood.txt with donor information. Each row should include last name, first name, blood type, Rh factor, systolic pressure, and diastolic pressure. Write a script named bloodDonors.m that reads the file and repeatedly asks the user to enter a donor name or Q to quit. If the donor is found, display the donor information in a table format.
Exercise 7: Experiment Log File
An engineering lab collects voltage and current data during an experiment. Each row of a text file contains a time value, voltage, and current. Write a MATLAB program that reads the file, calculates power using P = V .* I, and writes a formatted report to a new text file. The report should include column headings, all calculated power values, and the average power.