## Plotting horizontal line on Manipulate Plot

I have the following code, which outputs a Manipulate style plot. I want to draw a horizontal line on the plot related to q, with equation: y = Roche[\[rho]].

My code is as follows:

Constants  au = QuantityMagnitude[UnitConvert[Quantity[1, "AstronomicalUnit"], "Meters"]];  c = QuantityMagnitude[UnitConvert[Quantity[1, "SpeedOfLight"], "MetersPerSecond"]];  Qpr = 1;  Lsun = QuantityMagnitude[UnitConvert[Quantity[1, "SolarLuminosity"], "Watts"]];  Rsun = QuantityMagnitude[UnitConvert[Quantity[1, "SolarRadius"], "Meters"]];  Msun = QuantityMagnitude[UnitConvert[Quantity[1, "SolarMass"], "Kilograms"]];  G = QuantityMagnitude[UnitConvert[Quantity[1, "GravitationalConstant"], ("Meters"^2*"Newtons")/"Kilograms"^2]];  year = QuantityMagnitude[UnitConvert[Quantity[1, "Years"], "Seconds"]];  Myr = year*10^6;  Gyr = year*10^9;  Mwd = 0.6*Msun;  Cst = 1.27;  U = 1*10^17;   Functions  L[t_] := (3.26*Lsun*(Mwd/(0.6*Msun)))/(0.1 + t/Myr)^1.18;  Roche[dens_] := (0.65*Cst*Rsun*(Mwd/(0.6*Msun))^(1/3))/(dens/3000)^3^(-1);  Papsis[t_] := a[t]*(1 - e[t]);   Radiative Drag  RDdadtR\[Rho]a = -((3*L[t]*Qpr*(2 + 3*e[t]^2))/(c^2*(16*Pi*2000*Rast*a[t]*(1 - e[t]^2)^(3/2))));  RDdedtR\[Rho]a = -((15*L[t]*e[t])/(c^2*(32*Pi*Rast*2000*a[t]^2*Sqrt[1 - e[t]^2])));   Null  RDsolR\[Rho]a = ParametricNDSolveValue[{Derivative[1][a][t] == RDdadtR\[Rho]a, Derivative[1][e][t] == RDdedtR\[Rho]a, a[0] == a0, e[0] == 3/10}, {a, e}, {t, 0, 9*Gyr},      {Rast, \[Rho], a0}];   fRDticks = {{Automatic, Automatic}, {ChartingFindTicks[{0, 1}, {0, 1/Myr}], Automatic}};   Manipulate[Column[{Style["Working Plot", Bold], Plot[fun[func, t]/scale[func], {t, 0, 9*Gyr}, FrameTicks -> fRDticks,       PlotStyle -> {Directive[Blue, Thickness[0.01]]}], Style["Compiled Plot", Bold],      If[comp === {}, Plot[fun[func, t]/scale[func], {t, 0, 9*Gyr}, FrameTicks -> fRDticks, PlotStyle -> {Directive[Blue, Thickness[0.01]]}],       Plot[comp, {t, 0, 9*Gyr}, FrameTicks -> fRDticks, PlotStyle -> {Directive[Blue, Thickness[0.01]]}]]}], {{func, 1}, {1 -> "a", 2 -> "e", 3 -> "q"}},    {{Rast, 0.005}, 0.0001, 0.1, 0.001, Appearance -> "Labeled"}, {{\[Rho], 3000}, 1000, 7000, 50, Appearance -> "Labeled"},    {{a0, 10, "a0 (au)"}, 2, 20, 0.2, Appearance -> "Labeled"}, Button["Append", AppendTo[comp, fun[func, t]]], Button["Reset", comp = {}],    TrackedSymbols -> {func, Rast, \[Rho], a0}, Initialization :> {comp = {}, fun[sel_, t_] := Switch[sel, 1, RDsolR\[Rho]a[Rast, \[Rho], a0*au][[1]][t], 2,        RDsolR\[Rho]a[Rast, \[Rho], a0*au][[2]][t], 3, RDsolR\[Rho]a[Rast, \[Rho], a0*au][[1]][t]*(1 - RDsolR\[Rho]a[Rast, \[Rho], a0*au][[2]][t])],      scale[sel_] := Switch[sel, 1 | 3, au, 2, 1]}]  

I have tried to use Epilog but no line was displayed.

Any help would be appreciated.

## Can i use a string as an end of line delimeter when importing a csv to mysql?

Very basic question but im struggling with it. When i am importing a csv file to mysql is it possible to use any character or string as an end of line delimeter? If so is it possible from the admin window ‘Import’? Or must i do so in a sql query (doesnt seem logical).

So far i have had issues using everything besides \n and auto in the php my admin window. I tried the € sign i tried ///. Didnt work and got errors relating to an incorrect end of line delimeter.
Any help would be much appreciated. Thank you.

## Do you need line of sight to cast spells on someone?

The rules on spellcasting contain the following section:

### A Clear Path to the Target

To target something [with a spell], you must have a clear path to it, so it can’t be behind total cover. If you place an area of effect at a point that you can’t see and an obstruction, such as a wall, is between you and that point, the point of origin comes into being on the near side of that obstruction.

This section is not really clear to me. Should this mean that only non-transparent objects are a problem in targeting, or that you have to have line of sight and line of effect as well?

Also, can you prevent a wizard from casting spells by blinding her?

## Authorization error running db2 command line with db2inst1

I need to enable the COLUMNAR setting in DB2 Express Edition on Docker. For that to work I need to set INTRA_PARALLEL ON at the instance or database level.

I connect to the db2 command with db2inst1 that is the instance owner, but I’m getting an error saying that the user is root. How to fix this problem?

db2 => connect to bank0002 user db2inst1 using xxxxx     Database Connection Information   Database server        = DB2/LINUXX8664 11.5.4.0  SQL authorization ID   = DB2INST1  Local database alias   = BANK0002  db2 => UPDATE DBM CFG  USING INTRA_PARALLEL ON SQL5001N  "ROOT" does not have the authority to change the database manager  configuration file. 

## Line of Sight/Clear Path Check Theta* For Rectangle Character

I am implementing Theta* pathfinding in a tile-based 2D game. A tile is either blocked or unblocked. The character has a rectangle collider with a width and height in tiles. Is there an algorithm for finding all the tiles the rectangle will overlap when moving in a straight line from A to B on the tile grid?

## What is the point of this line in the Hide of the Feral Guardian?

The Hide of the Feral Guardian, a legendary item from the Explorer’s Guide to Wildemount, includes the following ability.

When you cast the polymorph spell using this armor, you can transform into a cave bear (use the polar bear statistics).

Why does it do this, and not just turn the user into either a polar bear or cave bear directly? At first I thought it might be because of the book each creature was from, but they both have stat blocks in the monster manual, and neither are in the explorer’s guide elsewhere as far as I can see.

## Full line trajectories plot for the solution of Second Order nonlinear coupled differential equations

I wanted to plot a phase plane containing the trajectories of the solutions found by using ‘NDSolve’ using the initial conditions for x[0], y[0], x'[0] and y'[0]. The equations are: x”[t] – 2 y'[t] == -x[t] + y[t]^2; y”[t] + 2 x'[t] == x[t] + y[t] + x[t]*y[t]

The equilibrium point for the system is (0,0). I have plotted the stream plot for the system but unable to plot a phase portrait that would give me the full line trajectories of the system for different initial conditions. I am also looking for any periodic solution if present in it. The stream plot I got is given below and I would take initial conditions from it.

I get this by using the Parametric Plot of the NDSolve solution:

Kindly help in this capacity. Thanks in advance.

## Unity: What does the green line gizmo signify?

When I place a point light it shows this green gizmo that ends in the terrain.
What’s the name of this gizmo?
What does it signify?

## LinearModelFit to find more than one linear regression line

I have a data that I used linearModelFit, to find the linear regression line. How can I get more than one linearmodelfit for the same data? more specifically I want 3 different functions for the linear regression with the built-in function LinearModelFit.

## How to move axis and ticklables in RegionPlot to the top? How to change border line color?

I use this code

RegionPlot[Sin[t^(1/3)*y] > 0, {y, 0, 5}, {t, 0, 8},   FrameLabel -> {"y", Rotate["t", 270 Degree]}] `

and the result is

Now, I have three questions:

1. How can I move the $$y$$ axis (and ticklabels) to the top instead of bottom?
2. How can I change border lines color?
3. Is it possible to change the color of one of the blue parts?