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1. SANJIVANI COLLEGE OF ENGINEERING, KOPARGAON
(An autonomous Institute affiliatedto SPPU Pune)
ENGINEERINGMATHEMATICSIIPRESENTATION
GUIDED BY:
PROF. A. S. AHER
6. Q.2) Write a computer programming for backward difference formula.
7. Step 1 - Define a function backward_difference_table(x, y)
that takes two arguments, x and y.
Step 2 -Calculate the length of y and store it in n.
Step 3 - Create a 2D table of size n x n filled with zeros.
Step 4 - Initialize the first column of the table with the
values of y.
Step 5 - Iterate over the remaining columns of the table
and calculate the backward differences using the formula
table[i][j] = table[i+1][j-1] - table[i][j-1].
Step 6 -Return the table.
Step 7 - Define a function
newton_backward_interpolation(x, x_values, y_values)
that takes three arguments, x, x_values, and y_values.
Step 8 - Calculate the length of x_values and store it in n.
Step 9 - Calculate the value of h as the difference between
the first two values of x_values.
Step 10 - Calculate the value of u using the formula u = (x
- x_values[n-1]) / h.
Step 11 -Calculate the backward difference table using the
backward_difference_table function.
Step 12 -Initialize the result variable with the value at the
bottom of the last column of the table.
Algorithm:
8. STEP 13 - ITERATE OVER THE REMAINING COLUMNS OF THE TABLE AND
CALCULATE THE INTERPOLATION USING THE FORMULA RESULT += TERM,
WHERE TERM IS CALCULATED AS TERM *= (U + J) / (J + 1).
STEP 14 -RETURN THE RESULT.
STEP 15 -TAKE USER INPUT FOR X, X_VALUES, AND Y_VALUES.
STEP 16 -CALCULATE AND DISPLAY THE BACKWARD DIFFERENCE TABLE.
STEP 17 -CALCULATE AND DISPLAY THE INTERPOLATED VALUE AT X.
9. Source Code:
def backward_difference_table(x, y):
n = len(y)
table = [[0 for _ in range(n)] for _ in range(n)]
for i in range(n):
table[i][0] = y[i]
for j in range(1, n):
for i in range(n-j):
table[i][j] = table[i+1][j-1] - table[i][j-1]
return table
def newton_backward_interpolation(x, x_values, y_values):
n = len(x_values)
h = x_values[1] - x_values[0]
u = (x - x_values[n-1]) / h
table = backward_difference_table(x_values, y_values) result = table[n-1][0]
10. Source Code:
# Taking user input for x, x_values, and y_values
x = float(input("Enter the value of x for which you want to find the value: "))
x_values = list(map(float, input("Enter the values of x (space-separated): ").split()))
# Calculating and displaying the backward difference table
table = backward_difference_table(x_values, y_values)
print("Newton's Backward Difference Table:")
for row in table:
print(row)
# Calculating and displaying the final output
output = newton_backward_interpolation(x, x_values, y_values)
printf("The interpolated value at x = {x} is: {output}")
16. Q.4) Find the center of mass of a thin , uniform plate whose shape is the region between
y = cos x and the x - axis between x= ℿ/2 and
x = ℿ/2. Since the density is constant , we may takep(x, y)= 1.
17. It is clear that 𝑥 = 0
but for matrics lets compute it
First we compute the mass
m= −𝛱/2
𝛱/2
. 0
𝑐𝑜𝑠𝑥
. 1 dydx = −𝛱/2
𝛱/2
.cosxdx= sin 𝑥 −𝜋 2
𝛱 2
=sin
𝜋
2
− sin −
𝜋
2
= 1 + 1 = 2 … sin −
𝛱
2
= − sin
𝜋
2
mx= −𝛱/2
𝛱/2
. 0
𝑐𝑜𝑠𝑥
.ydydx = −𝛱/2
𝛱/2
.
1
2
cos2 𝑥 𝑑𝑥 =
1
2
−𝛱/2
𝛱/2
. 𝑐𝑜𝑠2 𝑥 𝑑𝑥.
=
𝝅
𝟒
.
My= −𝛱/2
𝛱/2
. 0
𝑐𝑜𝑠𝑥
. xdydx
= −𝛱/2
𝛱/2
.x cos x dx=0
So 𝑥 = 0 𝑎𝑠 𝑌 =
𝜋 4
2
=
𝜋
8
20. References
Books:
1. B. S. Grewal, Higher Engineering Mathematics, 42nd ed. Khanna Publishers, 2012. ISBN: 978-8174091154.
2. H. K. Das, Engineering Mathematics. S Chand, 2006. ISBN: 8121905209.
3. G. V. Davis, Numerical Methods in Engineering and Science. Springer, 1986. ISBN: 978-94-011-6958-5.
4. R. K. Jain and S. R. K. Iyengar, Advanced Engineering Mathematics, Narosa Publishing House, 2014. ISBN: 978-
1842653418.
5. N. P. Bali and M. Goyal, A Text Book of Engineering Mathematics, 8th ed. Lakshmi Publications, 2012.ISBN: 978-
8131808320.
6. E. Kreyszig, Advanced Engineering Mathematics, 9th ed. Wiley, 2013. ISBN: 978-0471488859.
7. E. B. Staff and A. D. Snider, Fundamentals of Complex Analysis with Application to Engineering and Science, 3rd ed.
ISBN: 0139078746.
8. P. Dawkins, Calculus III, Lamar University Texas, 2018. [Online]. Available: http://tutorial.math.lamar.edu.
E-Resources
A. https://ocw.mit.edu/courses/18-04-complex-variables-with-applications-spring-2018/pages/lecture-notes/
B. https://www.codechef.com/
C. https://www.geeksforgeeks.org/courses?source=google&medium=cpc&device=m&keyword=geeksforgeeks&matchty
pe=e&campaignid=20039445781&adgroup=147845288105&gad_source=1&gclid=Cj0KCQjwk6SwBhDPARIsAJ59
GwegeTJbc6aGJqhfid7xlG892rYiAuuvZwkxULIPbtiDTYADMs8E3FEaAqF5EALw_wcB