# Understanding Matrix Suffix Notation

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• May 9th 2011, 06:05 AM
StaryNight
Understanding Matrix Suffix Notation
I'm having trouble interpreting matrices represented in suffix notation. For example, I am given that the matrices A, B and x have elements a(ij) b(ij) and x(i) respectively. I then have to write down the matrix represented by

http://latex.codecogs.com/gif.downlo...j}&space;x_{i}
[Edit: Latex corrected]
How do I work out what this summation represents.
• May 9th 2011, 07:00 AM
Sambit
Quote:

Originally Posted by StaryNight
I'm having trouble interpreting matrices represented in suffix notation. For example, I am given that the matrices A, B and x have elements a(ij) b(ij) and x(i) respectively. I then have to write down the matrix represented by

http://latex.codecogs.com/gif.downlo...}&space;x_{xi}

How do I work out what this summation represents.

I don't think your notations are correct.

First of all, you have $\displaystyle a_{ij}$ and $\displaystyle x_i$ then where does this $\displaystyle x_{ij}$ come from?

Secondly, I don't know what $\displaystyle k$ represents in $\displaystyle b_{kj}$.

Lastly, the suffix in $\displaystyle x_{xi}$ too has no meaning.
• May 9th 2011, 08:25 AM
StaryNight
Quote:

Originally Posted by Sambit
I don't think your notations are correct.

First of all, you have $\displaystyle a_{ij}$ and $\displaystyle x_i$ then where does this $\displaystyle x_{ij}$ come from?

Secondly, I don't know what $\displaystyle k$ represents in $\displaystyle b_{kj}$.

Lastly, the suffix in $\displaystyle x_{xi}$ too has no meaning.

Apologies, I managed to make a couple of mistakes doing the Latex. I've corrected my original post.