How to use matrix notations in my posts?

[Ronankeating]

Hi all,

I'm pretty new with how to use HTML text editor effectively when posting the new threads. Generally I can deal with math/physics symbols on the editor bar but don't now how to write that huge square brackets for, say 10x10, matrix and populate it.

Regards,

 

[robphy]

$$\left(<br /> \begin{array}{lrc}<br /> 1001 & 1002 & 1003\\<br /> 4 & 5 & 8\\<br /> \end{array}<br /> \right)$$ right-click it

 

[QuarkCharmer]

$$M =<br /> \left[ {\begin{array}{cc}<br /> x & y \\<br /> z & w<br /> \end{array} } \right]$$

http://www.rizauddin.com/2009/05/how-to-create-a-matrix-in-latex/

 

[micromass]

See https://www.physicsforums.com/showthread.php?t=546968

 

[Redbelly98]

$$\left(<br /> \begin{array}{lrc}<br /> 1001 & 1002 & 1003\\<br /> 4 & 5 & 8\\<br /> \end{array}<br /> \right)$$ right-click it

I find I have to do a little more:

• Right-click it
• Click or move cursor to "Show Math As"
• Click "TeX Commands"