# differential operator

I want to calculate below matrix vector multiplication which involve differentiation.

$$\left( {\begin{array}{*{20}{c}} { - \mu \left( r \right)}&{\Delta {e^{ - i\phi }}\left( { - {\partial _r} + \frac{{i{\partial _\theta }}}{r}} \right)}\\ {\Delta {e^{i\phi }}\left( { - {\partial _r} + \frac{{i{\partial _\theta }}}{r}} \right)}&{\mu \left( r \right)} \end{array}} \right){e^{in\theta }}\left( {\begin{array}{*{20}{c}} {{e^{ - i\phi /2}}\left[ {f\left( r \right) + ig\left( r \right)} \right]}\\ {{e^{i\phi /2}}\left[ {f\left( r \right) - ig\left( r \right)} \right]} \end{array}} \right)$$

I use "basic math assitant" to write the following However, it doesn't work. How to done it right?

• Please share the code in copyable form, so that other users can play with it. No one wants to retype all this code (and double check for correct transition). This will raise your chances for getting quick and competent help. Jun 10, 2018 at 8:55
• @MariuszIwaniuk Hi, The code directly copied is not perfect. So I attached a link to my notebook directly Jun 10, 2018 at 9:03
• we do not do links to notebooks at stackexchange. These could contains viruses. and when the link goes away, the question become useless. Code used should be posted in the question so it is self contained. Jun 10, 2018 at 9:06

A = Table[With[{t = t}, D[#, t] &], {t, {x, y}}, {i, 1, 2}];

$$\left( \begin{array}{c} u^{(1,0)}(x,y)+v^{(1,0)}(x,y) \\ u^{(0,1)}(x,y)+v^{(0,1)}(x,y) \\ \end{array} \right)$$