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## Engineering Models II

1 review
by: Chara Notetaker

33

2

3

# Engineering Models II

Marketplace > University of Cincinnati > > Engineering Models II
Chara Notetaker
UC

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"So much better than office hours. Needed something I could understand, and I got it. Will be turning back to StudySoup in the future"
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## Popular in Department

This 3 page Class Notes was uploaded by Chara Notetaker on Friday February 5, 2016. The Class Notes belongs to at University of Cincinnati taught by in Summer 2015. Since its upload, it has received 33 views.

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## Reviews for Engineering Models II

So much better than office hours. Needed something I could understand, and I got it. Will be turning back to StudySoup in the future

-Luz Zemlak

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Date Created: 02/05/16
Engineering Models II Lecture 01/19/2016 I. Multiplying Matrices >> A=[ 1 2; 3 5] A = 1 2 3 5 >> B=[-5 2;3 -1] B = -5 2 3 -1 >> >> A*B ans = 1 0 0 1 *Diagonals are 1 everything else is 0 >> A.*B ans = -5 4 9 -5 II. How to Calculate/Find Determinant det(A) ans = -1.0000 A=[ a b; c d] det(A)= |ab –cd| *Determinant will be zero, you won’t be able to solve linear equations, because an inverse does not exist; therefore, there is no intersection point. *[ A * B ] Will give you a completely different matrix dimension III. How to find the Intersection Point ( -5 ,6) >> >> c=[ -8 ;9] c = -8 9 >> d=[2 3; 3 1] d = 2 3 3 1 >> inv(d)*c ans = 5 -6 IV. Finding the Equation of a Parabola Y=ax^2+bx+C (2 ,5 ) 5= a(4)+b(2)+C (0,17) 17= a(0)+b(0)+C (5, 32) 32=a(25)+b(5)+C Write Matrix equation: A=[ 4 2 1 ; 0 0 1; 25 5 1] B=[ 5; 17 ; 32] det(A) ans=30 coeff= inv(A) *B coeff = 3.0 -12 17 Y=3x^2 -12x+17

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