# How do you write matrices on Socratic?

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Hello!

I'll show you first how to write matrices without the programmed version, so you know what to type between the #.

Let's say we want to make this generic matrix:

You would type ((a,b),(c,d))

So you put each row in a set of parenthesis and seperate your values from left to right with commas.. When you want to start a new row, you close the parenthesis, add a comma, and start a new set of parenthesis following the same process.

Let's put the a # on either side of ((a,b),(c,d)) to create our matrix:

You can now make the matrix as big as you would like with whatever numbers you like. For example, I can type this within two number signs ((-1,0,112),(0,-4,45),(-6,-6/5,-3)) to get:

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Describe your changes (optional) 200

I didn't want to alter Sally's excellent answer, so I posted this as a separate answer.

I want to show you some variations of the classic matrix format. You can write

*Without the hashtags*

[ (x, y, z), (1, 2, 3), (4, 5, 6) ]

*With the hashtags*

*Without the hashtags*

| (x, y, z), (1, 2, 3), (4, 5, 6) |

*With the hashtags*

*Without the hashtags*

|| (x, y, z), (1, 2, 3), (4, 5, 6) ||

*With the hashtags*

Found the last two while looking for ways to write definitions by cases :D

*Without the hashtags*

{ (x, y, z), (1, 2, 3), (4, 5, 6) :}}

*With the hashtags*

*Without the hashtags*

{: (x, y, z), (1, 2, 3), (4, 5, 6) :}

*With the hashtags*

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Describe your changes (optional) 200

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Here's what I've got too.

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Another type of brackets

(:(x,y,z),(a,b,c),(1,2,3):) or <<(x,y,z),(a,b,c),(1,2,3)>>

You can mix left and right sides independently (not including |)

[(x,y,z),(a,b,c),(1,2,3):)

{(x,y,z),(a,b,c),(1,2,3))

{:(x,y,z),(a,b,c),(1,2,3):}}

You can leave empty cells

((,y,),(a,,c),(,2,))

((x,,z),(,b,),(1,,3))

Nonsquare and nested matrices are also possible.

Describe your changes (optional) 200