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Maria2212

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@tomleslie  I see. The order cannot...

Maria2212 25
September 28 2021
0 0

@tomleslie 
I see. The order cannot be controlled. Thank you very much!

Thanks!...

Maria2212 25
April 01 2021
0 0

@acer 
 

Can I go into more detail, please?

assume I put in order to get a solution of the form:

_C1*sin(sqrt(-lambda)*v)+_C2*cos(sqrt(-lambda)*v)

linalg require the university, Digits to change the value to a larger one? % will be removed

Will it work after that?

Thanks!...

Maria2212 25
April 01 2021
0 0

@tomleslie 

Unfortunately, the version is only like this, the university only gives this))

@tomleslie  Could you help some mo...

Maria2212 25
March 15 2021
0 0

@tomleslie 

Could you help some more?
Your program works fine, I just need to substitute the resulting lambda in the equation, but again there is a problem with the loop (the sum is also not considered). What is the problem? Maple doesn't see the lambda?

As soon as I touch the code it stops working))

NULL
> 

restart; with(linalg); t := 2

2

 (1)
> 

S := proc (a, b, z) local L, y, s1, s2, sist, chl, lambda1, q, ef; interface(showassumed = 0); L := diff(y(x), x, x) = lambda*y(x); assume(lambda < 0); dsolve(L, y(x)); y := unapply(rhs(%), x); s1 := y(a) = 0; s2 := y(b) = 0; sist := {s1, s2}; genmatrix(sist, {_C1, _C2}); det(%); chl := combine(%); _EnvAllSolutions := true; solve(chl); sort(%); lambda1 := subs(indets(%, name)[] = k, %); lambda1 := unapply(%, k); lambda1(z); y(x); isolate(s1, _C2); subs(%, lambda = lambda1(z), y(x)); simplify(combine(%)); select(has, %, x); ef := unapply(%, x) end proc
> 

``
> 

``
> 

wl := interface(warnlevel = 0)
> 

sum(S(0, Pi, i), i = 1 .. 3)

3*summand

 (2)
> 

``
> 

wl := interface(warnlevel = 0); S(0, Pi, 3); interface(warnlevel = wl)

proc (x) options operator, arrow; sin((-lambda)^(1/2)*x) end proc

 (3)
> 

wl := interface(warnlevel = 0); S(0, Pi, 3); for i to t do S(0, Pi, i) end do; interface(warnlevel = wl)

proc (x) options operator, arrow; sin((-lambda)^(1/2)*x) end proc

  

proc (x) options operator, arrow; sin((-lambda)^(1/2)*x) end proc

  

proc (x) options operator, arrow; sin((-lambda)^(1/2)*x) end proc

 (4)


 

Download help1.mw
 

@tomleslie  Thank you very much I ...

Maria2212 25
March 15 2021
0 0

@tomleslie 

Thank you very much
I am a student, still studying at the university.
I use linalg, because that's what they taught me at the university
I've been studying Maple recently, so I make stupid mistakes

Thank you again, you are very smart!!))

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