mehran rajabi

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8 years, 61 days

MaplePrimes Activity


These are replies submitted by mehran rajabi

@Kitonum 

tnx my dear friend, this beautiful heart be for you. 

@Kitonum 

thank u, is there a way to express the result in serie(sigma) and if the condition was abs(1-x)>2 what would happen?

@Kitonum 

tnx for your answer. 

@RHERWOLF 

tnx for your answer, can you send me the Maple file here?

@Kitonum 

tnx, can I solve this below equation with this method:

eq := diff(F1(zeta), zeta, zeta)-b^2*F1(zeta)+2*exp(-b*zeta)*G1(zeta)+(exp(2*b*zeta)-2*exp(b*zeta)+1)*exp(-2*b*zeta)*(exp(b*zeta)*exp(-2*b*zeta)/(3*b)-(2*(exp(b*zeta)-1))*exp(-2*b*zeta)/(3*b))/(3*b^3)-(exp(b*zeta)-1)^2*(exp(-2*b*zeta))^2/(9*b^4)+(1/3)*(exp(b*zeta)-1)*exp(-2*b*zeta) = 0, diff(G1(zeta), zeta, zeta)-b^2*G1(zeta)-(exp(2*b*zeta)-2*exp(b*zeta)+1)*exp(-2*b*zeta)*exp(-b*zeta)/(3*b^2)-(2*(exp(b*zeta)-1))*exp(-2*b*zeta)*exp(-b*zeta)/(3*b^2)+b^2*exp(-b*zeta) = 0, 2*F1(zeta)+diff(H1(zeta), zeta) = 0
ics := F1(0) = 0, G1(0) = 0, H1(0) = 0, F1(infinity) = 0, G1(infinity) = 0

@nm 

tnx for the answer, I got this answer but I won't that inform limit, my answers must be:

@tomleslie 

alpha=sqrt((G*A)/(E*MI))

@acer 

thank you for your answer, I answer your questions hereunder:

I want to look for all the solutions and solve the system with the numeric method but when I use the fsolve command don't have all the answers and when using the solve command it takes a long time. is there any code, for example, Newton method code for solving it or I have to use the solve or fsolve commands? if I want to supposed to implement numeric rooting from scratch how can I do it?

with regards...

@Kitonum 

thank you, but is there any other command except solve & fsolve? because when numbers of my equations are increasing the solve command very takes a long time.

tnx...

@tomleslie 

thank you so much, if I want to write t[1],t[2],... instead of the t1,t2,... in your code, how can I do it? 

with regards. 

 

@Carl Love 

thank you for your answer, my unknowns are x[0], x[1], y[0],  y[1] but I want to solve them numerically by Newton’s method in t=0.5 for example.

@Kitonum 

thank you for your answer, I have to use the Gauss–Legendre quadrature rule for EQ after transformation that you did, has the Maple command for this rule? 

@Kitonum 

tnx my friend, I followed this command(unapply). thank you. 

@Carl Love 

tnx for your answer, I know that but can you express f function in terms of zeta only? my goal is to express f function in terms of zeta only and no x in it. 

@Carl Love 

Thank you so much, but this equation has several roots, how can I get the other roots?

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