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| − | = Defining with {{cmd|definemathmatrix}} =
| + | moved to [[Math/Matrices]] |
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| − | In order to type matrices in math formulas, there is the command {{cmd|definemathmatrix}}. Once a certain type of matrix is defined, one can also add a simple command in order to type matrices in a Matlab or Scilab format.
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| − | Here are a few examples.
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| − | <context source="yes">
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| − | \setuplayout[scale=0.8,width=13cm]
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| − | \definemathmatrix[pmatrix] % defining matrix with parentheses
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| − | [matrix:parentheses]
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| − | [simplecommand=pmatrix]
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| − | \definemathmatrix[bmatrix] % defining matrix with brackets
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| − | [matrix:brackets]
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| − | [simplecommand=bmatrix]
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| − | \definemathmatrix[determinant] % defining determinant with bars
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| − | [matrix:bars]
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| − | [simplecommand=thedeterminant]
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| − | Let $A$ be the matrix
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| − | \startformula
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| − | A = \startpmatrix
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| − | \NC 2 \NC 3 \NR
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| − | \NC 1 \NC 2 \NR
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| − | \stoppmatrix
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| − | \stopformula
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| − | Show that
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| − | \startformula
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| − | {\rm det}(A) = \startdeterminant
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| − | \NC 2 \NC 3 \NR
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| − | \NC 1 \NC 2 \NR
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| − | \stopdeterminant = 1
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| − | \stopformula
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| − | Compute the matrix $AB$ where $B$ is the matrix
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| − | \startformula
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| − | B = \pmatrix{2, -3 ; -1, 2}.
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| − | \stopformula
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| − | </context>
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| − | = Formatting delimiters with <tt>left</tt> and <tt>right</tt> =
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| − | It is possible to have different delimiters on the left and on the right. For instance:
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| − | <context source = yes >
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| − | \definemathmatrix[pvmatrix]
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| − | [left={\left(\thinspace},
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| − | right={\thinspace\right|}]
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| − | \definemathmatrix[rpmatrix]
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| − | [left={\left.\thinspace},
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| − | right={\thinspace\right]}]
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| − | \startformula
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| − | \startpvmatrix
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| − | \NC 11 \NC 12 \NC 13 \NR
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| − | \NC 21 \NC 22 \NC 23 \NR
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| − | \NC 31 \NC 32 \NC 33 \NR
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| − | \stoppvmatrix
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| − | \startrpmatrix
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| − | \NC 0 \NR
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| − | \NC 1 \NR
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| − | \NC 2 \NR
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| − | \stoprpmatrix
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| − | \stopformula
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| − | </context>
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| − | = Block matrices with vertical and/or horizontal lines =
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| − | In ConTeXt LMTX beginning version 2020-11-27, it is possible to create « block » matrices where the blocks are separated by vertical or horizontal lines (respectively {{cmd|VL}} and {{cmd|HL}}). For instance the above example can be typeset more easily by the following :
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| − | <context source = yes>
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| − | \definemathmatrix[mymatrix]
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| − | [left={\left\lparent\thinspace}, % instead of the left parenthesis, one can use any other fence
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| − | right={\thinspace\right\rparent}] % instead of the right parenthesis, one can use any other fence
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| − | \starttext
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| − | Here is $3 \times 3$ matrix with a column added to it
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| − | \startformula
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| − | \startmymatrix
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| − | \NC 11 \NC 12 \NC 13 \VL 0 \NR
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| − | \NC 21 \NC 22 \NC 23 \VL 1 \NR
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| − | \NC 31 \NC 32 \NC 33 \VL 2 \NR
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| − | \stopmymatrix
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| − | \stopformula
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| − | Here is a block matrix:
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| − | \startformula
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| − | \startmymatrix
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| − | \NC A \VL B \NR
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| − | \HL
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| − | \NC C \VL D \NR
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| − | \stopmymatrix
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| − | \stopformula
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| − | </context>
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| − | The two commands {{cmd|VL}} and {{cmd|HL}} take an optional parameter which defines the thickness of the rule and its color. So {{cmd|HL|[3,red]}} will produce a red horizontal rule three times thicker than the default matrix rule. The rule thickness for a specific matrix is defined with the {{code|1=[rulethickness=]}} parameter of {{cmd|definemathmatrix}}.
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| − | <context source=yes>
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| − | \definemathmatrix[mymatrix][matrix:parentheses][rulethickness=2pt]
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| − | \starttext
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| − | \startformula
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| − | \startmymatrix
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| − | \NC A \VL[3,green] B \NR
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| − | \HL[10,red]
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| − | \NC C \VL D \NR
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| − | \stopmymatrix
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| − | \stopformula
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| − | </context>
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| − | A {{cmd|VL}} counts as a hidden cell. To interrupt a vertical line, use an empty cell.
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| − | <context source=yes>
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| − | \definemathmatrix[mymatrix][matrix:parentheses]
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| − | \starttext
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| − | Weird matrix
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| − | \startformula
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| − | \startmymatrix
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| − | \NC A \VL B \NR
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| − | \HL[red]
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| − | \NC C \NC \NC D \NR
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| − | \stopmymatrix
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| − | \stopformula
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| − | This allows things like
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| − | \startformula
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| − | \startmymatrix
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| − | \NC A \VL B \NR
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| − | \HL
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| − | \NC \NC C \NC \NR
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| − | \stopmymatrix
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| − | \qquad
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| − | \startmymatrix
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| − | \NC A_1 \VL B_1 \NR
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| − | \HL
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| − | \NC \vdots \NC \vdots \NC \vdots \NR
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| − | \HL
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| − | \NC A_n \VL B_n \NR
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| − | \stopmymatrix
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| − | \stopformula
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| − | \stoptext
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| − | </context>
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