# Problem plotting asymptotes

**URL:** <https://community.wolfram.com/t/problem-plotting-asymptotes/7929>\
**Category:** Questions\
**Tags:** physics, graphics-and-visualization\
**Created:** [February 17, 2016, 10:31pm UTC](https://community.wolfram.com/t/problem-plotting-asymptotes/7929 "2016-02-17T22:31:24Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![mattheweaton2020](https://avatars.discourse-cdn.com/v4/letter/m/a4c791/32.png) [@mattheweaton2020](https://community.wolfram.com/u/mattheweaton2020)\
**Post date:** [February 17, 2016, 10:31pm UTC](https://community.wolfram.com/t/problem-plotting-asymptotes/7929/1 "2016-02-17T22:31:24Z")

</div>

Hey. I plotted in equation that is supposed to go to negative infitinity as it approaches 0. However, when I plot it, it jumps back up to 1 for some reason. But when I solve for a point near 0, it gives a correct value (approaching -inf). I attached the code and the graph. How to I solve this problem?

```
lambda = 2*10^-10; (*Jump Distance in m*)

k = 1.38064852*10^-23; (*Boltzmann Constant in J/K*)

Tm = 1357; (*Melting Point of Copper in K*)

h = 6.62607004*10^-34; (*Planck's Constant in J*s*)

Ga = 4.8065*10^-20; (*Activation energy in J*)

L = 13260; (*Heat of Fusion in J/mol*)

Vm = 7.589*10^-6; (*Molar volume in m^3/mol*)

gamma = 0.140; (*Interfacial energy in J/m^2*)

gamma2 = 0.24; (*Interfacial energy in J/m^2*)

Na = 6.0221409*10^23; (*Avagadro's Number in atom/mol*)

rho = 0.126 *10^6 ; (*Density of Copper in mol/m^3*)

Jss = (2*lambda/h)*((k*gamma*(Tm - dT))^(1/2))*((rho^2)*(Vm)*
     Na)*(Exp[-(16*Pi*((Vm*Tm)^2)*gamma^3)/(3*(L^2)*(dT^2)*
         k*(Tm - dT)) - Ga/(k*(Tm - dT))])*(1/100)^3;

Jss2 = (2*lambda/h)*((k*gamma2*(Tm - dT))^(1/2))*((rho^2)*Vm*
     Na)*(Exp[-(16*Pi*((Vm*Tm)^2)*gamma2^3)/(3*(L^2)*(dT^2)*
         k*(Tm - dT)) - Ga/(k*(Tm - dT))])*(1/100)^3;

LogPlot[{Jss, Jss2}, {dT, 00, 600}, 
 PlotRange -> {{0, 600}, {10^-300, 10^60}}, 
 Frame -> {{True, True}, {True, True}}, 
 FrameLabel -> {"Undercooling (K)", "Jss (1/(cm^3*s))"}, 
 PlotLabel -> "Steady State Nucleation of Solid Copper", 
 PlotLegends -> {"\[Gamma] = 0.140 J/m^2", "\[Gamma] = 0.240 J/m^2"}]

```

---

<div class="post-metadata">

**Author:** ![jasondbiggs](https://yyz1.discourse-cdn.com/wolfram/user_avatar/community.wolfram.com/jasondbiggs/32/28365_2.png) [@jasondbiggs](https://community.wolfram.com/u/jasondbiggs)\
**Post date:** [February 18, 2016, 2:28pm UTC](https://community.wolfram.com/t/problem-plotting-asymptotes/7929/2 "2016-02-18T14:28:43Z")

</div>

As written, your code won’t run. But your plot looks similar to those seen here: [http://mathematica.stackexchange.com/a/107396/9490](http://mathematica.stackexchange.com/a/107396/9490)

maybe those answers could help you.