## differential equation...

i want to solve this equation,

y''(x)=5*exp(-10/y'(x)) on ]0,15[ with y(0)=0,y(15)=2

can any one help me ? thank you

## how do I remove the error "initial Newton iteratio...

Respected member!

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## intial value is not converging...

Dear please check once it showing an error program.mw as intial value is not conververging

## Fourth order problem showing use midpoint method...

Dear sir,

I tried to solve a fourth order problem. But I got the error message as better to use midpoint method. Can I know what is midpoint method and here I uploading the problem please verify it if I did anything mistake?program.mw

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## How do i fix the error"Newton iteration is not con...

Respected member!

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## Error, (in dsolve/numeric/BVPSolve) singularity en...

hi.

how i can dsolve this differential equations?

thanks

## ODE with boundary conditions involving limits...

Respected member!
Please help me to find the solution of attached problem, I am a new user so pleaes forgive any mistakes.

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## how do i solve the boundary conditions...

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I found the solution of P(r) at P(0)=0, but could obtain the result of v(r) at v(1014030)=-0.4283, v(r) may have a graph such that i can goes from -0.4283 to 0.

## how to solve the challenging non linear coupled 1s...

G := 6.6743*10^(-8);

a := 1.9501*10^24;

b := .3306;

c := 2.99792458*10^10;

d := 2.035;

pi := 3.143;

eps := 3.8220*10^35;

g(r) = 1-s(r)/0.06123;

j(r) = e^(-(1/2)*w(r))*(1-2*G*v(r)/(r*c^2))^.5

sys := diff(v(r), r) = 4*pi*r^2*eps/c^2, ics=v(0)=0

diff(u(r), r) = -G*(eps+u(r))*(v(r)+4*Pi*r^3*u(r)/c^2)/(c^2*(r^2-2*G*r*v(r)/c^2)),u(0)=1.3668*10^34

diff(w(r), r) = 1.485232054*10^(-28)*(v(r)+4.450600224*10^(-21)*pi*r^3*u(r))/(r^2-2*G*r*v(r)/c^2), conditions: w(0)=0,iterate it to find w(688240)=-2.05684, it solve must satistfy the both conditions.

diff(r^4*j(r)*(diff(g(r), r)), r)+4*r^3*g(r)*(diff(j(r), r)) = 0, conditions dg(r)/dr =0  at r=0, g(688240) =0.87214

diff(J(r), r) = (8*pi*(1/3))*(eps/c^2+u(r)/c^2)*(g(r)*j(r).(r^4))/(1-2*G*v(r)/(r*c^2)) condition J(0)=0.

## Error in dsolve/numeric/bvp...

Hello every one ;

i have these flowing error :

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any solution ?

thank you

Best regards !

## boundary conditions...

Dear sir in this problem should accept five boundaryconditions but it is not working for five boundary conditions and showing the following error please can you tell why it is like this ??

Error, (in dsolve/numeric/bvp/convertsys) too many boundary conditions: expected 4, got 5
Error, (in plots:-display) expecting plot structures but received: [fplt[1], fplt[2], fplt[3], fplt[4], fplt[5], fplt[6], fplt[7]]
Error, (in plots:-display) expecting plot structures but received: [tplt[1], tplt[2], tplt[3], tplt[4], tplt[5], tplt[6], tplt[7]]

stretching_cylinder_new1.mw

## Error, (in fproc) unable to store 'HFloat(1.043007...

Please anyone, I have been battling with this problem for a while yet the error message keeps coming. Would be happy if responded to.

Thanks

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## Error, (in dsolve/numeric/bvp/convertsys) too few ...

If i have boundary conditions with D(psi), i have no problem. But if i have condition with psi(infinity) (which i need), Maple says "too few boundary conditions". Maybe i make stupid mistakes, but i don't see.

restart;
assume(r, nonnegative);
ic_Re := `&psi;Re`(0) = 0, (D(`&psi;Re`))(0) = 0;
ic_Im := `&psi;Im`(0) = 0, (D(`&psi;Im`))(0) = 0;
V0 := 2.5; ERe := 1.5; EIm := 1.2; `&hbar;` := 6.582; mu := 938.27*(1/2); Q0 := 1.5; Rq := 4.5; Rv := 2.5;
Q := proc (r) options operator, arrow; -Q0*exp(-r/Rq) end proc;
V := proc (r) options operator, arrow; -V0*exp(-r/Rv) end proc;
`Eqn_&psi;Re` := -`&hbar;`^2*(diff(`&psi;Re`(r), r, r)+2*(diff(`&psi;Re`(r), r))/r)/(2*mu)-ERe*`&psi;Re`(r)+V(r)+EIm*`&psi;Re`(r) = Q(r);
`Eqn_&psi;Im` := -`&hbar;`^2*(diff(`&psi;Im`(r), r, r)+2*(diff(`&psi;Im`(r), r))/r)/(2*mu)-EIm*`&psi;Re`(r)-ERe*`&psi;Im`(r) = 0;
F := dsolve({ic_Im, ic_Re, `Eqn_&psi;Im`, `Eqn_&psi;Re`}, numeric);
plots[odeplot](F, [r, `&psi;Re`(r)], r = 0 .. 20, numpoints = 500);

plots[odeplot](F, [r, `&psi;Re`(r)], r = 0 .. 20, numpoints = 500);

restart;
assume(r, nonnegative);
ic_Re := `&psi;Re`(0) = 0, `&psi;Re`(infinity) = 0;
ic_Im := `&psi;Im`(0) = 0, `&psi;Im`(infinity) = 0;
V0 := 2.5; ERe := 1.5; EIm := 1.2; `&hbar;` := 6.582; mu := 938.27*(1/2); Q0 := 1.5; Rq := 4.5; Rv := 2.5;
Q := proc (r) options operator, arrow; -Q0*exp(-r/Rq) end proc;
V := proc (r) options operator, arrow; -V0*exp(-r/Rv) end proc;
`Eqn_&psi;Re` := -`&hbar;`^2*(diff(`&psi;Re`(r), r, r)+2*(diff(`&psi;Re`(r), r))/r)/(2*mu)-ERe*`&psi;Re`(r)+V(r)+EIm*`&psi;Re`(r) = Q(r);
`Eqn_&psi;Im` := -`&hbar;`^2*(diff(`&psi;Im`(r), r, r)+2*(diff(`&psi;Im`(r), r))/r)/(2*mu)-EIm*`&psi;Re`(r)-ERe*`&psi;Im`(r) = 0;
F := dsolve({ic_Im, ic_Re, `Eqn_&psi;Im`, `Eqn_&psi;Re`}, numeric);
Error, (in dsolve/numeric/bvp/convertsys) too few boundary conditions: expected 5, got 4

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