55 Reputation

4 Badges

9 years, 299 days

MaplePrimes Activity

These are replies submitted by rashmi


Yes you are right,

now I'm trying GrtensorII for it,

I've installed it in maple12 now there in operators is Rayeqn[v],

But I could not understand how these operators will work??

In previous query I wanted to know solution of expansion,shear and rotation in terms of initial values as a function of affine parameters.

@Preben Alsholm 

great, it worked.

thanks a lot

@Carl Love 

I selected some specific value of L and E also initial condition for

but whatever value I am giving I'm not getting other kinds of orbits, such as scattering and bound orbits.

I plotted like this,

> Sol := dsolve({r(0) = .1, diff(r(phi), phi) = sqrt(1/16-(1/16*(1-2/r(phi)-.1*r(phi)))*(16/r(phi)^2+1))}, r(phi), numeric);
> plots:-changecoords(plots:-odeplot(Sol, [r(phi), phi], phi = 0 .. 2*Pi, scaling = constrained, coords = polar, linestyle = 4, color = blue), polar);

@Carl Love 

I want to have different orbits for eq,

but I am getting only plunging orbits, how to set initial conditions, can you help? (α=0.0005)

@Carl Love 

Is it possible to have multiple plots of above kind?


Thank you,

Can you help me further,

How can I plot a polarplot using numeric solution.?

@Mac Dude 

Thanks 4 ur valuable comments,

It will help me for sure,

first I'll look for boundary value problem,


@Mac Dude 

this solution I am getting on solving the deviation equation, which is

diff(eta(tau), tau, tau)+(8*M^2*lambda^2/(4*tau^2*M^2*lambda^2+Q^2)-32*Q^2*M^2*lambda^2/(4*tau^2*M^2*lambda^2+Q^2)^2)*eta(tau) = 0


solution of this equation will tell about deviation vector and tidal forces on neighbouring geodesics, so it should not be complex.

range of parameters is like,


tau= -infty to +infty

M and Q can be taken as any positive numbers in three conditions as

M>Q, M=Q, M<Q

To have eta real should I take C1, C2 complex?

@Carl Love 

I have checked the imaginary part, it is close to zero.

range of tau is from -infty to +infty,

M>0 (can be taken any positive number upto infty),

Q>0 (can be taken any positive number upto infty),


solution eta(tau) is geodesic deviation so it should not be imaginary kind of thing, so I'll have totake C1 C2 accordingly.


@ecterrab yes that's right, I'm doing r(phi) everywhere in calculations,

actually I want to reproduce the orbits related to Schwarzschild Bh where I'm getting this equation,

now how can I proceed with this equation to plot the orbits with different values of E and L.


@Carl Love thanks 4 ur valuable comments,

How can I have more than one odeplots in single frame?

also I want to increase the size of text done by "textplot" in usual plots, how can I do this?


@cosmicstring Thanks a lot


@Kitonum thanks a lot, it worked

1 2 Page 2 of 2