CGN 3421
Computer Methods
Fall 2000
CGN 3421
lab6_cmf01.fm
page 1 of 2
Lab #6
10/10/01
Matrix Operations:
Given the following system with unknowns x, y, z :
1) Find the inverse of the coefficient matrix above using GaussJordan Elimination by hand:
2) Solve for x, y, z using the inverse you just found
4) Solve for x, y, z
with the same coefficient matrix but with a new solution vector. Use the
inverse from the previous problem
5) Confirm your answers in Mathcad
Confirmation problem for HW#6:
The solution to homework #6 will be difficult to confirm without running a problem with a known
solution first. Some of you have taken or are taking a class that would help you out. Others have
not yet taken that class. So, the following is the input and proper solution to the truss homework
problem with different values than you have been given.
INPUT:
A=5 in2,
E=29000 ksi,
F(1) = 20 kips,
F(2) = 100 kips,
F(3) = 150 kips
OUTPUT :
r(1) =
0.00662
r(2) = 0.00310
r(3) =
0.09931
(all in inches)
Hints for HW#6
Your function that calculates displacement should be given A, E, L, F as input
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 Spring '08
 Long
 Linear Algebra, Invertible matrix, Vector graphics, Function composition

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