My Math Forum Matrix

 LaTex Help Help with LaTex and writing math equations

 September 9th, 2018, 09:48 AM #1 Newbie   Joined: Sep 2018 From: Naharlagan Posts: 1 Thanks: 0 Matrix can anyone give me idea about how to type matrix in computer
 September 9th, 2018, 02:32 PM #2 Senior Member   Joined: Feb 2016 From: Australia Posts: 1,801 Thanks: 636 Math Focus: Yet to find out. Thatâ€™s too general a question. Are you using a particular software or programming language? edit: I just noticed you've posted in the LaTeX forum... This ought to get you started: https://en.wikibooks.org/wiki/LaTeX/...ces_and_arrays Thanks from greg1313, topsquark and NRTYRYNYNYR Last edited by Joppy; September 9th, 2018 at 02:46 PM.
 September 9th, 2018, 04:20 PM #3 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,935 Thanks: 1129 Math Focus: Elementary mathematics and beyond Actually, I moved the post here - but $\LaTeX$ is probably a good place to start. Thanks from Joppy
 September 9th, 2018, 06:39 PM #4 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,935 Thanks: 1129 Math Focus: Elementary mathematics and beyond $$\begin{bmatrix} x_{11}&x_{12}&x_{13} \\ &. \\ &. \\ &. \\ x_{n-2}&x_{n-1}&x_n \end{bmatrix}$$
 September 21st, 2018, 03:23 AM #5 Newbie   Joined: Sep 2018 From: USA Posts: 3 Thanks: 0 Hello, there was a matrix problem I was unable to work out completely: 'Your task is to crack the following code and find the encrypted word. To make your task easier, the following information about the encoding matrix is given: Position 1,1 in the encoding matrix is an even number The decoding matrix only contains integers Position 1,1 in the encoding matrix is the negative of the number in position 1,1 in the decoding matrix Modulo arithmetic hasn't been used My coded message is: 91, -38, 137, -59, 145, -59 How would I go about solving it; I know that E^-1 x EA will decipher the message. But would I place it in a 2x2 or a 3x3 matrix? How would I work out the encoding matrix? Thank you in advance!

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