(4) Problem 18.7. Use the following instructions: a. Use 1st-order LaGrange interpolation with X0=3 and x₁ = 5. b. Use 2nd-order LaGrange interpolation with x0 = 2, x₁ = 3, x2 = 5. c. Determine f(4) using MATLAB's 'spline' function. d. Determine f(4) using MATLAB's 'interp1' function. e. Determine f(4) using MATLAB's 'polyfit' and 'polyval' functions. 18.6 Given these data X 1 2 3 5 7 8 f(x) 3 6 19 99 291 444 Calculate f(4) using Newton's interpolating polynomials of order 1 through 4. Choose your base points to attain good accuracy. What do your results indicate regarding the order of the polynomial used to generate the data in the table? 18.7 Repeat Prob. 18.6 using Lagrange polynomials of order 1 through 3.

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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(4)
Problem 18.7. Use the following instructions:
a. Use 1st-order LaGrange interpolation with X0=3 and x₁ = 5.
b. Use 2nd-order LaGrange interpolation with x0 = 2, x₁ = 3, x2 = 5.
c. Determine f(4) using MATLAB's 'spline' function.
d. Determine f(4) using MATLAB's 'interp1' function.
e. Determine f(4) using MATLAB's 'polyfit' and 'polyval' functions.
Transcribed Image Text:(4) Problem 18.7. Use the following instructions: a. Use 1st-order LaGrange interpolation with X0=3 and x₁ = 5. b. Use 2nd-order LaGrange interpolation with x0 = 2, x₁ = 3, x2 = 5. c. Determine f(4) using MATLAB's 'spline' function. d. Determine f(4) using MATLAB's 'interp1' function. e. Determine f(4) using MATLAB's 'polyfit' and 'polyval' functions.
18.6 Given these data
X
1
2
3
5
7
8
f(x) 3
6
19
99 291
444
Calculate f(4) using Newton's interpolating polynomials of order
1 through 4. Choose your base points to attain good accuracy. What
do your results indicate regarding the order of the polynomial used
to generate the data in the table?
18.7 Repeat Prob. 18.6 using Lagrange polynomials of order
1 through 3.
Transcribed Image Text:18.6 Given these data X 1 2 3 5 7 8 f(x) 3 6 19 99 291 444 Calculate f(4) using Newton's interpolating polynomials of order 1 through 4. Choose your base points to attain good accuracy. What do your results indicate regarding the order of the polynomial used to generate the data in the table? 18.7 Repeat Prob. 18.6 using Lagrange polynomials of order 1 through 3.
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