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 February 10th, 2019, 07:47 AM #1 Newbie   Joined: Feb 2019 From: Poland Posts: 3 Thanks: 0 Mathematical notation of matrix Hi, I would like to know how is the mathematical notation to describe the selection of a part of a Matrix, eg. in Matlab B=A(1:3,1:2) I appreciate your help February 10th, 2019, 10:10 AM #2 Senior Member   Joined: Sep 2016 From: USA Posts: 642 Thanks: 406 Math Focus: Dynamical systems, analytic function theory, numerics What you want is usually called a submatrix of $A$, but I don't know of any standard notation. There are a few ways I can think of that are reasonable to write this. 1. $B$ is the $3 \times 2$ submatrix of $A$ obtained by truncation to its first 3 rows and first 2 columns. 2. $B$ is the $3 \times 2$ submatrix of $A$ with entries given by $(a_{ij})$ for $1 \leq i \leq 3$ and $1 \leq j \leq 2$. I think if you specify the exactly size of $B$ it's not hard for readers to understand. If you are writing a paper which needs to describe a lot of these "slicing" operations, it is best to decide on a reasonable notation and define it ahead of time. Last edited by skipjack; February 10th, 2019 at 10:20 AM. February 10th, 2019, 11:16 AM #3 Newbie   Joined: Feb 2019 From: Poland Posts: 3 Thanks: 0 Thank you very much!!, you have answered my question  Tags matematical, mathematical, matrix, notacion, notation Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post Ku5htr1m Economics 1 March 24th, 2016 08:45 AM Nudd Abstract Algebra 2 October 11th, 2015 02:57 PM MathSeeker Calculus 3 April 12th, 2015 12:35 AM Archon Linear Algebra 2 August 5th, 2013 12:42 PM YaronBS Applied Math 3 March 17th, 2013 01:21 AM

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