# Matricies Help

• Mar 21st 2014, 04:06 PM
sakonpure6
Matricies Help
I just started learning about Matrices as part of of self study unit.
Did I do a) and b) correctly? and can someone help me with c) I do not understand what to do, is Bart represented by b, Casey by c ??? what subscripts do I use to represent the matrix described?
Attachment 30475
Attachment 30476
Attachment 30477
• Mar 21st 2014, 04:10 PM
romsek
Re: Matricies Help
a and b are correct

In this matrix the intersection of person A and person B the value is 1 if they share a class, 0 otherwise. The matrix is nothing but 1's and 0's.

Just represent it as they've shown
Amy = 1
Bart = 2
Casey = 3
Djamshid = 4

so element (2,3) represents whether Bart and Casey share a class.
• Mar 21st 2014, 04:16 PM
sakonpure6
Re: Matricies Help
so for the element (2,3) I am going t refer to it as: a23 (that's how I read online to name elements) but where would the 1 or the 0 go to indicate that the students are in the same class??
• Mar 21st 2014, 04:31 PM
romsek
Re: Matricies Help
Quote:

Originally Posted by sakonpure6
so for the element (2,3) I am going t refer to it as: a23 (that's how I read online to name elements) but where would the 1 or the 0 go to indicate that the students are in the same class??

\$a_{23}=1\$ or \$a_{23}=0\$ works. Or you could just draw a matrix and fill it out. They've already drawn it for you on that sheet. Just put the 1's and 0's where they belong.
• Mar 21st 2014, 04:38 PM
sakonpure6
Re: Matricies Help
Oh I get it, I thought I had to write the element position in the matrix >.<