Combining colors with matrices

Combining colors with matrices

[David Eric Cox]

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Can anyone direct me to either traditional ConTeXt math documentation on how to produce matrices or tell me how to show a variable in bold redin MathML? I am producing pdf files exclusively.

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Re: Combining colors with matrices

[David Eric Cox]

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Never mind. That was stupid of me. I can do it by containing a generalized fraction within \( and \).

Still getting used to thinking on multiple levels (TeX,ConTeXt,MathML, etc.)

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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Wednesday, July 15, 2020 9:38 AM, David Eric Cox <davidericcox@protonmail.com> wrote:

> Can anyone direct me to either traditional ConTeXt math documentation on how to produce matrices or tell me how to show a variable in bold redin MathML? I am producing pdf files exclusively.
>
> Sent with [ProtonMail](https://protonmail.com) Secure Email.

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Re: Combining colors with matrices

[Otared Kavian]

Hi David,

Regarding matrices, below is an example. You can choose the names pmatrix, etc as you wish. There is even a module which allows you to compute the product of two matrices, etc (with \usemodule[m-matrix], see m-matrix.mkiv).

%% defining matrix with parentheses
\definemathmatrix[pmatrix]
	[matrix:parentheses]
	[simplecommand=pmatrix]

%% defining matrix with brackets
\definemathmatrix[bmatrix]
	[matrix:brackets]
	[simplecommand=bmatrix]
 
%% defining determinant with bars
\definemathmatrix[determinant]
	[matrix:bars]
	[simplecommand=thedeterminant]
	
\starttext
Let $A$ be the $3\times 3$ matrix defined by
\startformula
A := 
\startpmatrix
	\NC 11 \NC 12 \NC 13 \NR
	\NC 21 \NC 22 \NC 23 \NR
	\NC 31 \NC 32 \NC 33 \NR
\stoppmatrix .
\stopformula
This matrix can also be dfined by the Matlab structure of a matrix:
\startformula
A := \pmatrix{11,12,13 ; 21, 22, 23 ; 31, 32, 33}
\stopformula
Compute the value of
\startformula
\alpha := \thedeterminant{11,12,13 ; 21, 22, 23 ; 31, 32, 33} = {\rm det}(A).
\stopformula
\stoptext

Best regards: Otared K.

> On 15 Jul 2020, at 15:38, David Eric Cox <davidericcox@protonmail.com> wrote:
> 
> Can anyone direct me to either traditional ConTeXt math documentation on how to produce matrices or tell me how to show a variable in bold red in MathML?  I am producing pdf files exclusively.
> 
> 
> Sent with ProtonMail Secure Email.
> 
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________

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