10.18.3 Can you answer these questions?

10.18.3.1 How to make small package (new style) in notebook for testing?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=303767

Sometimes it is easier to test package inside notebook without having to make .m file and read it each time. This can be  done using the official package style like this 
In new cell we type 
... 
[packages]
 

asked by Nasser https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=70 Score of 2

10.18.3.2 How can I extract the constant coefficient in polynomial?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=303751

I have an equation with this form:  eq1 = 0.38*u1[t] + 0.285*u1[t]*v1[t] + 0.85*u1[t]^2 . 
I want to extract the coefficient of ... 
[coefficients]
 

asked by saboor savvafi https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=98465 Score of 1

answered by yarchik https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9469 Score of 0

10.18.3.3 How can I incorporate a switching parameter value (like a telegraph process) in a coupled SDE?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=303713

I have a coupled 2D Langevin Equation: 
$$dx(t)/dt = v(t)\cos(\phi(t)) + \sigma_t \, \text{noise}_{1x}(t), $$ 
$$dy(t)/dt = v(t)\sin(\phi(t)) + \sigma_t \, \text{noise}_{1y}(t), $$ 
$$d\phi(t)/dt = \... 
[differential-equations] [stochastic-calculus]
 

asked by novice https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=30988 Score of 2