@sand15 you coding is nice, and also outcome, your coding is like maccdara ? he is expert, is been a while he missing ,

i am try to use your code but this unapply i cant work with it is not do any substitute your did write but with missing , your function eqfcomplex =f(x,y,z,t) i have use this in 2*ln(f)_x/f, your function must not contain any l[1] and l[2] , then from finding x and y when take derivative by t we put that point in that equation by name (eqp)  x=xp-(this take derivate by t from x[0] )*twe find critical point then we obtain the line by this function y=m*(x-x[0])+y[0] where x[0] and y[0] we can get by the critical point when t=0

i got this error this time

Line-1-Done.mw

@dharr i try to solve without making z=0 but at end i have to do z=1,  i got this error this time,

Error, invalid operator parameter name 

after i finish the plot after removing this issue i will send you, then judge me 

Line-1-Done.mw

@dharr is not wrong becuase when i plot 3D i make it t and z be constant so in here i just make z be number, i just don't know how make that D remove and my function run at there

@dharr  in lump plots we have another kinnd of plotting which show that thus lump how move when time,in most paper do that ,i did too to some but in here i got this problem, any news about long wave limit?

i can't fixed how i do eval z=0, in fact is not zero but i will make it zero becuase in this case i can plot it otherwise i don't think i can find the line along with moving lump i did my try but i didn't figure out, how fixed?

 Line-1-Done.mw

@janhardo i want remove tht D in top

@dharr this is novel methods and I am chosen to apply for one of the equation I will work on it by the last ode which work. Thanks a lot 

about long wave limit, I know every structure but is a little bit long It contain two maple file except some extra function which need more maple file I will send you after I compact and write a good explanation, I know every structure and I know they do by two way in first we will start by my last equation is necessary to find out this step my package is missing something with out this .

@dharr it is work but i don't know why is not fast as i want , i dont need all parameter so this must make the procudure faster but i don't know if i have 7 equation so must be easy for finding 7 parameter the main parameter is A[0]-A[2] and B[0]-B[2] and if add one another like w it will be good ,  i think it will be wrong if i find lambda att all becuase in some pace in future steps i have option for lambda like testing ode solution inside radical for example sometime we say lambda[2]>0 or<0 
dear Dr did you see my last question about long wave limit? really i am in bad situation i add some explanation if you watch you will figure out i am sure about that ?

i have to test all of thus

tt1.mw

@janhardo  is not related to bilinear form is so different this is another topic just apply change F2 to eq 14 by that information in pdf

@janhardo  is not even close to our  solution, don't use series like that in begin start with F2 as i give it to you then apply to long wave limit then you have to get eq14 also for F4 you have to get eq20, so you have to use this two function begin  and do  that operation i explained in top as Ai did find each term seperatly  like A[12]=1and some term will be zero  watch the step   i showed in picture in top tell your Ai to get the result by thus explanation if it can

@janhardo  we have a series to construct them i have tht series you constructed last time, but in some Function like F5 and F3 i have to apply this long wave limit if by using F2 i give it to you you reach the eq(14) and by F4 you reach eq(20) then i will give you other Function like i F3 and F5 to apply by long wave limit untill  F5 the long wave limit exist but i need to apply to finded just focus on how change F2 to equation 14 and F4 to equation 20

@janhardo  let me see it  what you did , in this topic just this step remain which i am very intrested to do

@janhardo  download the last update of maple file i replaced the F4 tested you have to get F4 by applying the long wave limit on it F4 in maple file

@janhardo i have to finish the long wave limit then i will explain all structure ...

@janhardo I think in this example is like that I have to check in other example too, is complicate a lot 

@dharr i know each steps, but my idea for solving is not good and not fast i will try to hundle by slow way i will try them one by one it take a lot of my time but i will do that, thanks a lot for you