woofwoof

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6 years, 219 days

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These are replies submitted by woofwoof

thanks guys you have been very helpfuk, if all the terms have values e.g any number, is there a way to get maple to plot say A_1 to A_6 if that makes sense. e.g if A_1=3, A_2=4, A_3 = 5 etc then plot A_j against these numbers?

thanks guys you have been very helpfuk, if all the terms have values e.g any number, is there a way to get maple to plot say A_1 to A_6 if that makes sense. e.g if A_1=3, A_2=4, A_3 = 5 etc then plot A_j against these numbers?

Also the actual equation i wanted to solve is diff(X(x), x, x)+(1.6+4*cn(x, 2)^2)*X(x),

where cn^2 is the elliptic cosine^2 Im notsure if that was what i had plotted, sorry for the trouble.

thats what i thought but their seems to be a graph, what about if we just arbitrarily say the limitsa are 0 to 1000, can that be plotted?

thats what i thought but their seems to be a graph, what about if we just arbitrarily say the limitsa are 0 to 1000, can that be plotted?

yeah thanks that was a bit sloppy of me i also forgot the paaramter T;

 

This is the set of equations:

U := diff(P(t), t) = -7*10^(-8)*t/sqrt(R(t)*t+R(t)), diff(R(t), t) = 7*10^(-8)*t^2/sqrt(R(t)*t+R(t))+600*(X^2-7.8*t^3*T^(3/2)*10^(-23)*exp(-1.15*10^12/T))/(t*sqrt(R(t)*t+R(t))), -4*10^5*(X^2-7.8*t^3*T^(3/2)*10^(-23)*exp(-1.15*10^12/T))/(t^2*sqrt(R(t)*t+R(t)));

 

The initial conditions are when x=xI and as before; 

initial := R(x) = 0, Z(x) = 0, P(x) = y;
R(x) = 0, Z(x) = 0, P(x) = y
> dsolve(U(t), initial);
Error, (in dsolve) Required a specification of the indeterminate function

 

sorry for being a bit sloppy, I am trying to solve these versions of the boltzmann equations to then plot each solution on a graph against x.

yeah thanks that was a bit sloppy of me i also forgot the paaramter T;

 

This is the set of equations:

U := diff(P(t), t) = -7*10^(-8)*t/sqrt(R(t)*t+R(t)), diff(R(t), t) = 7*10^(-8)*t^2/sqrt(R(t)*t+R(t))+600*(X^2-7.8*t^3*T^(3/2)*10^(-23)*exp(-1.15*10^12/T))/(t*sqrt(R(t)*t+R(t))), -4*10^5*(X^2-7.8*t^3*T^(3/2)*10^(-23)*exp(-1.15*10^12/T))/(t^2*sqrt(R(t)*t+R(t)));

 

The initial conditions are when x=xI and as before; 

initial := R(x) = 0, Z(x) = 0, P(x) = y;
R(x) = 0, Z(x) = 0, P(x) = y
> dsolve(U(t), initial);
Error, (in dsolve) Required a specification of the indeterminate function

 

sorry for being a bit sloppy, I am trying to solve these versions of the boltzmann equations to then plot each solution on a graph against x.

Thanks, this has been helpful

Thanks, this has been helpful

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