Which of the following is the correct syntax to fit a quadratic polynomial to data vectors x and y using polyfit?

easy📝 Syntax Q12 of 15

MATLAB - Numerical Methods

Which of the following is the correct syntax to fit a quadratic polynomial to data vectors x and y using polyfit?

Ap = polyfit(x, y, 2);

Bp = polyfit(y, x, 2);

Cp = polyfit(x, y, 3);

Dp = polyfit(x, 2, y);

Step-by-Step Solution

Solution:

Step 1: Identify correct argument order
The syntax is polyfit(x, y, n) where n is the polynomial degree.
Step 2: Confirm degree for quadratic
Quadratic means degree 2, so the third argument must be 2.
Final Answer:
p = polyfit(x, y, 2); -> Option A
Quick Check:
polyfit(x, y, 2) fits quadratic [OK]

Quick Trick: Remember order: x, y, degree in polyfit [OK]

Common Mistakes:

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