i had 3 nonlinear equations and i want to convert them to the form of multiplications of a MATRIX in a VECTOR, but none of these two methods give me the right answer,what should i do?

#method one#

restart:
with(LinearAlgebra):
eq1:=a[1]+a[2]*a[3]^2*a[1]+a[2]*a[3]-a[1]^2:
eq2:=a[3]+a[1]^3+a[2]*a[3]+a[2]^2-a[1]^2:
eq3:=a[1]^3+a[2]^3+a[1]*a[2]*a[3]+a[1]*a[2]-a[3]:
for i to 3 do
B || i := eq || i ; K || i := Vector[row](3):
for j to 3 do

Hi,

I found the plotted phase portrait strange and i verified it with phaseportrait

With plot :

Dear guys!

I have two expressions in terms of one variable. For example A(t) and B(t). Now, I want to plot A in terms of B. What should I do?

I cannot obtain this relation analytically because both expressions in terms of "t" are very complicated. But I can plot both of them. Now, I need to plot A in terms of B.

Thanks a lot.

hey friends am stuck with some code. My code is correct and am trying to find exact solution but not able to see output. Please kindly check it and let me know exact_solution.mw

> test1r := dsolve((Diff(f(x,y), t, t))*x+(Diff(f(x,y), t))*y = 0, f);

Error, (in dsolve) expected an ordinary differential equation. Received: 0 = 0

another question is

i do not know whether can 

 dsolve((Diff(f(x,y), (x,y), (x,y)))*x+(Diff(f(x,y), (x,y)))*y = 0, f);

Hello,

I want to report a strange behaviour when working with bras and kets from the physics package. Working in a discrete basis, Ket(Phi,m) and Ket(Phi,n) should be orthogonal as long as m neq n. At least this is said so in the Physics-Example document.

However when I enter Bra(Phi,0).Ket(Phi,4) Maple returns 1! Just with 4 - all other integer values n > 1 give zero, as it should be! Maybe I am completely misunderstanding something here or this result is...

I consider a PDE system (?pdsolve,numeric)

PDE := {diff(u(x,t),t)=-1/20*diff(v(x,t),x,x),
diff(v(x,t),t)=diff(u(x,t),x,x)}:

IBC := {u(x,0)=sin(Pi*x), u(0,t)=0, u(1,t)=0,
v(x,0)=1-x, v(0,t)=1, v(1,t)=0}:

pds := pdsolve(PDE, IBC, numeric, spacestep=1/50);

Suppose, I need to use the data diff(u(x,t),x,x)  or diff(v(x,t),x,x) at x=0.

Hi, i wouls lij=ke to see the consequences of damping on coupled oscillators.

I encounter no problem with

restart; m := 1; k1 := 1; k2 := 1; lambda := 0;

eq1 := m*diff(x1(t), `$`(t, 2)) = -k1*x1(t)+k2*(x2(t)-x1(t))-lambda*diff(x1(t), t);

eq2 := m*diff(x2(t), `$`(t, 2)) = -k2*(x2(t)-x1(t)); ICS := x1(0) = 1, x2(0) = 0, (D(x1))(0) = 0, (D(x2))(0) = 0; sol2 := dsolve({ICS, eq1, eq2}, {x1(t), x2(t)});

plot(eval(x2(t), sol2), t = 0 .. 20);

Hi,

Really, can't understand why there's a problem in the line desolve

restart;

eq1 := m*(diff(x1(t), t, t))-f = 0;

f := -k*x1(t)+k*(x2(t)-x1(t))-lambda*(diff(x1(t), t)) ;

g := -k*(x2(t)-x1(t)); eq2 := m*(diff(x2(t), t, t))-g = 0;

fcns := {x1(t), x2(t)};

ICS := {x1(0) = 1, x2(0) = 0, D(x1)(0) = 0, D(x2)(0) = 0};

sys := {eq1, eq2}; m := 1; k := 1; lambda := 1; sysdiff := sys union ICS;

hi dear

i am a student of m.phil in maths.

i am doing my research in numerical solution of fractional derivatives but

i am facing a little problem in writing the code for fractional derivatives by hpm

in mathematica software if you are having any code kindly sent it to me

thanks

Hi

1st, sorry, i did'nt find the "question" forum so i post here

2nd, difficulties in converting the maple code in text here

3rd : my problem of the day

retart :eq1 := m*(diff(x1(t), t, t))-f = 0; f := -k*x1(t)+k2*(x2(t)-x1(t))-lambda*(diff(x1(t), t));

eq2 := m*(diff(x1(t), t, t))-g = 0; g := -k2*(x2(t)-x1(t)); fcns := x1(t), x2(t);

ICS := {x1(0) = 1, x2(0) = 0, (D(x1))(0) = 0, (D(x2))(0) = 0};

sys := {eq1, eq2};...

I want to print     a_n   is  in  S .

Here are what I tried.

So here is what I need to do within Maple.  I have to define a piecewise function and then determine left and right hand derivatives at a certain x value.  Then determine the whole derivative and graph both parts.  I am just pretty new to Maple so it is still fairly confusing and I cannot determine the exact commands that I need.

hi,look at that. I obtain a curve. But when i do it again