mehdi jafari

Ask a Question

Create a Post

13 Badges

Member for: 12 years, 107 days

Contact mehdi jafari

MaplePrimes Activity

These are questions asked by mehdi jafari

plot an indefinite integral ...

Asked: mehdi jafari 749 Product: Maple

August 14 2017

2 5

hi every one, i want to plot an indefinite integral , it is some what complex and maple can not compute the answer, ( but numeric integration can be computed) , but we want to plot the output, what should we do ? tnx for help in advance

corrected.mw

weighted norm of an expression...

Asked: mehdi jafari 749 Product: Maple

August 14 2017

1 2

how can we compute wighted norm of a matrix or a vector in maple?

a mathematical question about a continuo...

Asked: mehdi jafari 749 Product: Maple

August 10 2017

1 0

on the basis of Fundamental theorem of calculus, the function " f " has Antiderivative F , whichi F is continuous and differentiabe in the range of integration, i have a question ? if function f has an Antiderivative F, should it be also continuous and differentiabe in that range? in the picture below it says "when f is continuous", can f be discontinuous? how it can be ? any examples?

suggestion on faster solving set of nonl...

Asked: mehdi jafari 749 Product: Maple

August 04 2017

1 2

#first_question :how can i solve set of nonlinear ODEs,faster or using any packages ?
#second_question :what can be some boundary conditions for this type of nonlinear ODEs? how many BCs are required for this set of nonlinear ODEs? ( to use numeric solution)

>	restart:with(DEtools):with(DifferentialAlgebra):

>	eq[1]:=diff(N(r),r$2)+2/rdiff(N(r),r)+diff(phi(r),r)/phi(r)diff(N(r),r)-mu^2/(32phi(r))N(r);

diff(diff(N(r), r), r)+2*(diff(N(r), r))/r+(diff(phi(r), r))*(diff(N(r), r))/phi(r)-(1/32)*mu^2*N(r)/phi(r)

(1)

>	eq[2]:=diff(phi(r),r$2)+2/rdiff(phi(r),r)-1/2diff(phi(r),r)^2/phi(r)-8diff(N(r),r)^2/(omega(1-2GM/r))*phi(r);

diff(diff(phi(r), r), r)+2*(diff(phi(r), r))/r-(1/2)*(diff(phi(r), r))^2/phi(r)-8*(diff(N(r), r))^2*phi(r)/(omega*(1-2*G*M/r))

(2)

>	dsolve({eq[1],eq[2]});

Download nonlinear_ODE.mw

problem with an ode...

Asked: mehdi jafari 749 Product: Maple

July 04 2017

1 2

i want to solve an ode , but maple return an integral in result, how can i have an answer?

restart:

>	eq:=1/(xy^(2/3))8.62068965517241510^(-16)(-3.1110^23x^2y^(7/6)-3.9210^19y^(25/6)+2.1454503999999910^29(0.0108exp(-45.07/y)+exp(-19.98/y^(1/3)-0.00935317203476387y^2)))/(x+0.015y^(1.2));

0.8620689655e-15*(-0.3110000000e24*x^2*y^(7/6)-0.3920000000e20*y^(25/6)+0.2317086432e28*exp(-45.07/y)+0.2145450400e30*exp(-19.98/y^(1/3)-0.935317203476387e-2*y^2))/(x*y^(2/3)*(x+0.15e-1*y^1.2))

(1)

>	eq:=subs(y=y(t),eq):

>	ans:=dsolve(diff(y(t),t)=eq);

t+Intat((12500/1724137931)*x*_a^(2/3)*(3*_a^(6/5)+200*x)/(49*_a^(25/6)+388750*x^2*_a^(7/6)-2896358040*exp(-(4507/100)/_a)-268181300000*exp(-(1/100000000000000000)*(935317203476387*_a^(7/3)+1998000000000000000)/_a^(1/3))), _a = y(t))+_C1 = 0