Final Exam Review Part 2 MATLAB CHE 160

Final Exam Review Part 2 - MATLAB CHE 160 SI – BECCA FALL 2016

MATLAB What do you remember? What are you concerned about?

Basics What do these commands or notations do? clc clear % ; n

Basics- Answers clc - clears command window clear - clears workspace % - makes a comment ; - suppresses values from showing in command window n – return to the next line (like hitting enter)

Vectors Fill in where the starting and ending values go and step size/number of places in the vector. Spring_vector = _______: _______ ; Spring_vector 2 = linspace(_______, ________);

Vectors- Answers Spring_vector = starting value : step size : end value ; Spring_vector 2 = linspace(start, end, number points)

Assorted How do you transpose/flip a vector or matrix? What does the function input( ) do? How do you use fprintf( )?

Assorted- Answers Single apostrophe transposes ◦ column_vector = row_vector’ ; input( ) allows the user to put in a value from the command window ◦ Candy_Hearts = input(‘How many candy hearts do you eat each Valentine’s Day? ’) ; fprintf( ) displays text and numbers into the command window from script ◦ fprintf(‘You eat %g candy hearts each Valentine’s Day. n’, Candy_Hearts)

Graphing How do you plot 2 sets arrays of data? What is the difference between plot(), semilogy(), and loglog() How do you use ‘Marker. Face. Color’? What is the letter for a line, circle, and triangle? What is the letter for black, magenta, blue, green, and red?

Graphing- Answers How do you plot 2 sets arrays of data? plot(a, b) What is the difference between plot(), semilogy(), and loglog() Rectangular, semilog with y log scale, log-log plot How do you use ‘Marker. Face. Color’? Change color of the marker face in a plot to fill What is the letter for a line, circle, and triangle? ‘-’ ‘o’ ‘^’ What is the letter for black, magenta, blue, green, and red? ‘k’ ‘m’ ‘b’ ‘g’ ‘r’

Polyfit/Polyval Why do you use polyfit and polyval? What does polyfit find? What does polyval find? Fill in the blanks: ◦ __ = polyfit(_____, _____); ◦ __ = polyval(______, ______);

Polyfit/Polyval- Answers Why do you use polyfit and polyval? Fitted line for the data, linear regression for Matlab What does polyfit find? Polynomial coefficients, m slope and b intercept What does polyval find? Fitted dependent values Fill in the blanks: ◦ P = polyfit(x, y, [degree of polynomial]); ◦ yfit= polyval(P, xfit);

Loops What is the basic structure of… ◦For loop ◦If Loop ◦While Loop

For Loops- Answers for (counting statement) calculations and statements end

If Loops- Answers if (conditional statement) calculation/statement else final option end

While Loops- Answers %Initialize value while (conditional statement) calculations end

Loops What is the difference between the structure of a for and while loop? How can you use nested for loops to create matrix?

Loops- Answers What is the difference between the structure of a for and while loop? For iterates a certain number of times, while does it until a condition is met, unknown number of iterations How can you use nested for loops to create matrix? Matricx(r, c) = 3*r-c;

Matrices [A][x] = [b] [x] = [A][b]

Functions Function [Outputvariable] = Function. Name(inputvariable) Calculations Outputvariable = calculation

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