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1

One option using blkarray: The code: \documentclass{article} \usepackage{blkarray} \usepackage{amsmath} \begin{document} \begin{blockarray}{ccccc} x_{1} & x_{2} & \cdots & x_{n} \\ \begin{block}{[cccc|c]} a_{11} & a_{12} & \cdots & a_{1n} & b_{1} \\ a_{21} & a_{22} & \cdots & a_{2n} & b_{2} \\ ... 3 I hope the following is what you're looking for. \documentclass{article} \usepackage{amsmath,mleftright} \mleftright % eliminate whitespace inserted by \left and \right \begin{document} \[ \left( \begin{bmatrix}M_{11}&M_{12}\\M_{21}&M_{22}\end{bmatrix} + \begin{bmatrix}A_{11}&A_{12}\\A_{21}&A_{22}\end{bmatrix} \right) \begin{bmatrix} ... 2 Summarizing some of my earlier comments: Use the standalone package with the option preview in order to avoid getting an error message about a missing  symbol. Don't use  in a LaTeX document to start and end displaymath mode, as it's quite deprecated. See Why is [ ... ] preferable to  ... ? for more information on this subject. The matrix ... 5 You are unnecessarily grouping interior content inside the align and bmatrix environments. Remove those inner groups which are causing the mismatched brace groups: \documentclass{article} \usepackage{amsmath} \begin{document} \begin{subequations} \begin{align} % State Equations X^{(c)}_{t + 1} &= \begin{bmatrix} \gamma & ... 2 Don't use display math if you don't want equations centered: Code: \documentclass[11pt,paper=a4,answers]{exam} \usepackage{graphicx,lastpage} \usepackage{amsmath, amsthm, amssymb, amsfonts} \usepackage{upgreek} \usepackage{censor} \censorruledepth=-.2ex \censorruleheight=.1ex \hyphenpenalty 10000 ... 4 The following uses cases and some \phantom/overlapping in order to achieve the appropriate layout: \documentclass{article} \usepackage{mathtools} \begin{document} c(t)=\left\{\begin{matrix} 0 & 0 < t < \Delta t \\ \alpha e^{-t/T_{1b}} & \Delta t < t < \Delta t + \tau \\ 0 & t > \Delta t ... 8 Use the align environment: Aligning the right hand side requires more tweaking by using either a \makebox of the appropriate width, and/or using an \hphantom{} to insert additional spacing. If you want the left side to be centered, the replacing the right with a centered alignment: \newcommand*{\MakeBox}[1]{\makebox[\widthof{\WidestText}][c]{#1}} ... 3 1. Random Colors: Here is an adaptation of Drawing grids filled with random selected colors and connecting them which alows you to specify the dimensions of the matrix: 2. Colors Specified per Cell: If you wish to specify the colors for each cell, then you can use the datatool package to read in a CSV file which contains the mapping from a number to a ... 1 The matrix environments of the amsmath package have to be set in math mode. You didn't do that, thus TeX is searching for some  which enables this math mode. If you put it in $$...$$, $$$$...$$$$, \[$$...$$, \begin{displaymath}$$...$$\end{displaymath}, $$...$$ or \begin{equation*}$$...$$\end{equation*}, (and most certainly others$$...$$,) it will $$...$$

1

Another option \documentclass{scrartcl} \usepackage{mathtools} \usepackage{xparse} \ExplSyntaxOn \NewDocumentCommand \vect { s m } { \IfBooleanTF { #1 } { \chen_v_vector:n { #2 } } { \chen_h_vector:n { #2 } } } \cs_new_nopar:Npn \chen_h_vector:n { \chen_vector_aux:nn { & } } \cs_new_nopar:Npn \chen_v_vector:n { \chen_vector_aux:nn { \\ } ...

7

If you want to keep the alignment between the columns, use an array, with some enhancement: \documentclass[12pt,a4paper]{article} \usepackage{amsmath} \usepackage{array} \begin{document} The reparameterisation is \label{eqn:linear_ssK3} \begin{array}{@{} >{{}}r<{{}} @{}r@{\,} *{5}{c} @{\,}l@{}} s = & [ & s_1 & s_2 ...

2

Here's a solution along the lines @Sigur suggested. (I was working on it while he was commenting.) To get the inner alignment you wanted I hard coded some whitespace. If you need to do this often you'll need a more elegant solution. \documentclass[12pt,a4paper]{article} \usepackage{amsmath} \begin{document} The reparameterisation is \begin{align} ...

5

Don't use equation for multi-line equations use align and don't use matrix for aligning whole equations just use it for making matrices, or here you can use bmatrix as sigur suggests. \documentclass[12pt,a4paper]{article} \usepackage{amsmath} \begin{document} The reparameterisation is \label{eqn:linear_ssK3} \begin{aligned} s&= ...

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