Recall & Review
beginner
What does the
polyfit function do in MATLAB?The
polyfit function finds the coefficients of a polynomial that fits a set of data points in a least-squares sense.Click to reveal answer
beginner
How do you use
polyfit to fit a straight line to data points?Use
polyfit(x, y, 1) where x and y are data vectors, and 1 means a first-degree polynomial (a line).Click to reveal answer
intermediate
What is the purpose of the
fit function in MATLAB?The
fit function fits curves or surfaces to data using different models like polynomial, exponential, or custom equations.Click to reveal answer
beginner
What kind of output does
polyfit return?polyfit returns a vector of polynomial coefficients starting with the highest degree term.Click to reveal answer
beginner
How can you evaluate a polynomial fit obtained from
polyfit?Use
polyval(p, x) where p is the coefficient vector from polyfit and x is the input data to get fitted values.Click to reveal answer
What does the number 2 represent in
polyfit(x, y, 2)?✗ Incorrect
The third argument in
polyfit is the degree of the polynomial to fit.Which MATLAB function can fit custom models to data?
✗ Incorrect
fit allows fitting with custom or predefined models.What does
polyval(p, x) do?✗ Incorrect
polyval evaluates the polynomial with coefficients p at values x.If you want to fit a straight line to data, which degree do you use in
polyfit?✗ Incorrect
Degree 1 means a linear (straight line) fit.
Which function returns polynomial coefficients in descending order of power?
✗ Incorrect
polyfit returns coefficients starting from the highest degree term.Explain how to fit a polynomial curve to data points using MATLAB functions.
Think about how to get coefficients and then use them to find fitted values.
You got /3 concepts.
Describe the difference between
polyfit and fit functions in MATLAB.Consider flexibility and types of models each function supports.
You got /3 concepts.