Supposed to be a Jacobian - What is wrong?

[Math Amateur]

Can someone help ... the following is supposed to be a Jacobian matrix ...= $$ \begin{pmatrix} \frac{ \partial F_1}{ \partial x_1} & \frac{ \partial F_1}{ \partial x_2} \\ \frac{ \partial F_2}{ \partial x_1} & \frac{ \partial F_2}{ \partial x_2} \\ \frac{ \partial F_3}{ \partial x_1} & \frac{ \partial F_3}{ \partial x_2} \end{pmatrix} $$
But it won't display ... comes up with an error ...

Actual Latex code is as follows:\begin{pmatrix} \frac{ \partial F_1}{ \partial x_1} & \frac{ \partial F_1}{ \partial x_2} \\ \frac{ \partial F_2}{ \partial x_1} & \frac{ \partial F_2}{ \partial x_2} \\ \frac{ \partial F_3}{ \partial x_1} & \frac{ \partial F_3}{ \partial x_2} end{pmatrix}
Can someone please diagnose what is wrong ...

Help will be appreciated,

Peter

 

[phymat]

Can someone help ... the following is supposed to be a Jacobian matrix ...= $$ \begin{pmatrix} \frac{ \partial F_1}{ \partial x_1} & \frac{ \partial F_1}{ \partial x_2} \\ \frac{ \partial F_2}{ \partial x_1} & \frac{ \partial F_2}{ \partial x_2} \\ \frac{ \partial F_3}{ \partial x_1} & \frac{ \partial F_3}{ \partial x_2} end{pmatrix} $$
But it won't display ... comes up with an error ...

Actual Latex code is as follows:\begin{pmatrix} \frac{ \partial F_1}{ \partial x_1} & \frac{ \partial F_1}{ \partial x_2} \\ \frac{ \partial F_2}{ \partial x_1} & \frac{ \partial F_2}{ \partial x_2} \\ \frac{ \partial F_3}{ \partial x_1} & \frac{ \partial F_3}{ \partial x_2} end{pmatrix}
Can someone please diagnose what is wrong ...

Help will be appreciated,

Peter

You need a backslash towards the end:

\begin{pmatrix} \frac{ \partial F_1}{ \partial x_1} & \frac{ \partial F_1}{ \partial x_2} \\ \frac{ \partial F_2}{ \partial x_1} & \frac{ \partial F_2}{ \partial x_2} \\ \frac{ \partial F_3}{ \partial x_1} & \frac{ \partial F_3}{ \partial x_2} end{pmatrix}

$$\begin{pmatrix} \frac{ \partial F_1}{ \partial x_1} & \frac{ \partial F_1}{ \partial x_2} \\ \frac{ \partial F_2}{ \partial x_1} & \frac{ \partial F_2}{ \partial x_2} \\ \frac{ \partial F_3}{ \partial x_1} & \frac{ \partial F_3}{ \partial x_2} \end{pmatrix}$$

 

[MarkFL]

The ending tag wasn't escaped...I edited your post to do so. :)