[Tex/LaTex] How to create a simple partitioned matrix


I wish to create a matrix as displayed in the encircled region on the right
(taken from here)
enter image description here

However, the code on the left does not seem to be generating the vertical through the matrix. Instead I am only getting one horizontal bar through the matrix.

Can someone please provide a simple code that generates the block/partitioned matrix on the right?


Best Answer

Use a vertical bar in the format specification: c|c. A complete example:



M & N \\
R & S


enter image description here

As a side note, don't use $$...$$ in modern LaTeX documents; use \[...\]. See Why is \[ ... \] preferable to $$ ... $$?.

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