Recent content by jadyliber

Sorry, is there power \frac{1}{2} in the coefficients of the above equations?

Thanks again to bill & jack

I am sorry for it. by the way, is there a Mathematica forum? thanks for advices

I need to NDsolve four differential equations. But I find my code does not work. Who can give me some suggestions? Thanks!

Thanks for Jack'S and Bill's kind help. I can run some basic code mow. While I still have some related problems. Since I have solution near the r-> 0^+, and I still have some symmetry to set A_0=1, chi_0=0 and c_0=1, the only changing initial condition B_0 and q. That is in the following code...

Thanks for Bill's and Jack's comments and sorry for my mistake in nb first. Next I will try and report it later. So waiting for me. Thanks again. By the way, to Bill, all your guesses are absolutely right.

The following is the code, and it does not work. I do not know whether the code itself is ok. Thanks " rstart = 0.001; mysol = NDSolve[{d''[r] + (2/r + x'[r]/2 + c'[r]/c[r]) d'[r] == 0, -(x'[r]/r) + c'[r]/c[r] (g'[r]/g[r] - x'[r]) == ( q^2 (b[r])^2 (a[r])^2)/(r^2 (c[r])^2 g[r])...

May I ask a stupid question? Are d0 and d1 functions of rstart or just a number using rstart=0.001? Thanks!

Thanks a lot. I will try and report it later.

About serval differential equations where A, B, D, g, \chi, c are functions of r \begin{eqnarray} &-\frac{{\chi}'}{r}+\frac{c'}{c}\left(\frac{g'}{g} -{\chi}'\right)=\frac{e^{\chi}(q A B)^2}{r^2 g^2 c^2}& \\ &c c''+c c'\left(\frac{g'}{g}+\frac{2}{r} -\frac{{\chi}'}{2} \right)=-\frac{B'^2}{2...