# Quick question about matrix symbol used

• February 21st 2010, 09:11 PM
aznprdgy
Quick question about matrix symbol used
What does the following mean ?

A1 ↔ A2

where a1 and a2 are 2 different matricies?

i know http://ceee.rice.edu/Books/CS/chapter2/img34.gif is used to indicate that the matrix preceding the arrow will be changed using the operation specified but i dont remember what that symbol means
• February 22nd 2010, 01:17 AM
Opalg
Quote:

Originally Posted by aznprdgy
What does the following mean ?

A1 ↔ A2

where a1 and a2 are 2 different matricies?

i know http://ceee.rice.edu/Books/CS/chapter2/img34.gif is used to indicate that the matrix preceding the arrow will be changed using the operation specified but i dont remember what that symbol means

I would need to see the context to be sure of what that notation means. Sometimes, it is used to indicate that the matrices commute, in other words $A_2A_1=A_1A_2$.
• February 22nd 2010, 07:49 AM
aznprdgy
if p != i then perform A1 <=> A2
where p is the lowest interger and i is indicates the matrix row

its a step used in gaussian elimination process