# How do you write matrices on Socratic?

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8
Apr 29, 2015

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:

$\left(\begin{matrix}a & b \\ c & d\end{matrix}\right)$

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:

$\left(\begin{matrix}- 1 & 0 & 112 \\ 0 & - 4 & 45 \\ - 6 & - \frac{6}{5} & - 3\end{matrix}\right)$

Then teach the underlying concepts
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6
Apr 30, 2015

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

$\left[\begin{matrix}x & y & z \\ 1 & 2 & 3 \\ 4 & 5 & 6\end{matrix}\right]$

• Without the hashtags

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

• With the hashtags

$| \left(x , y , z\right) , \left(1 , 2 , 3\right) , \left(4 , 5 , 6\right) |$

• Without the hashtags

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

• With the hashtags

$| | \left(x , y , z\right) , \left(1 , 2 , 3\right) , \left(4 , 5 , 6\right) | |$

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

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

• Without the hashtags

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

• With the hashtags

$\left.\begin{matrix}x & y & z \\ 1 & 2 & 3 \\ 4 & 5 & 6\end{matrix}\right.$

Then teach the underlying concepts
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