## solving a partial differential equation...

Hi,

can anyone help me in solving the following PDE:

restart:

with(PDEtools):

`> PDE := M1(x1, x2)*(diff(M1(x1, x2), x1))+(diff(M1(x1, x2), x2))*M2(x1, x2)*(1+x1^2)-2*x1*M2(x1, x2) = 0;`
` `
`thank you,`
`regards,`
`Mutaz`

## has testeq a bug?...

testeq() gives inconsistent results. See this example:

Equation (1):

computes to

Equation

## boundaries in matrix or rtable, how can i do that...

hey guys , my concern is about boundaries in random matrix or rtable. so, i can garantee that boundaries in  matrices are in 0 and 10, but i can´t impose a restriction  like the sum of row must be equal 10 for example.
help !!

pop:=(10-0)*ArrayTools:-RandomArray(proc(A)
local i
if A::rtable[row] then
seq(A(i),i=1..NumElems(A));
else
args
end if
end proc(10,3))+0;

## plots have black contours in Maple 16...

Hello!

Maple 16 differs from Maple 15  (Linux, 64 bit )  in that the plots (both 2D and 3D) have all lines contoured in black.

How to disable such new behaviour?

## for loop plotting...

`Hello,`
`I need help on plotting in for loop.`
`for M from 1.1 by .2 to 1.7 do for F from -3 to 3 by 0.1 do F2[F]:=dsolve(d1, numeric,output=listprocedure):  end do:for F from -3 to 3 by 0.1 do P2[F]:=subs(F2[F],P1);P3[F]:=evalf(Int(P2[F],0..1)); end do:IQ:=Vector([seq(F,F=-3..3,0.1)]):DT:=Vector([seq(P3[F],F=-3..3,0.1)]):plot(IQ,DT);end do;`
`The above code gives me 4 separate plots, but I want them all in just one plot.`

## How to solve this inequality?...

How to solve this inequality? 6/(2*x+1)>(1+log[2](2+x)/x). I tried

solve(6/(2*x+1)>(1+log[2](2+x)/x),x);

I receive: "Warning, solutions may have been lost."

## Maple no longer computes integrals after Ubuntu Up...

Sorry, I understand that my question sounds crazy, but that's what happened:

I had a working Maple program  and Maple 15 installation on Ubuntu 11.10 64 bit

After I updated to Ubuntu 12.04 ,  Maple 15  starts, but returns almost all (except most primitive)  integrals unevaluated.

My old working worksheets not return all integrals unevaluated.

Same with Maple 14.

I have no idea what could have happened...

## (in expand/bigprod ) object too large...

Hello,

1-I have one calculation and the result is "Error, (in expand/bigprod) object too large"... What can I do with this error?

thamks alot.

## in expand/bigprod &Length of output exceeds limit ...

Hello,

1-I have one calculation and the result is "Length of output exceeds limit of 1000000"... What can I do with this error?

2-I have one calculation and the result is "Error, (in expand/bigprod) object too large"... What can I do with this error?

## Run loop for valid inputs...

`here is my code i want to run the loop for every value if there is invalid input in lhs(ans(1)) the loop should not stop and check for next value`
`> restart;> > f1 := proc (x) options operator, arrow; R*T*(x*ln(x)+(1-x)*ln(1-x))+Omega[l]*x*(1-x) end proc;x -> R T (x ln(x) + (1 - x) ln(1 - x)) + Omega[l] x (1 - x)> > g1 := proc (x) options operator, arrow; (1-x)*SfA*(T-TfA)+x*SfB*(T-TfB)+R*T*(x*ln(x)+(1-x)*ln(1-x))+Omega[s]*x*(1-x) end proc;`

## how can i solve this equation...

hi

thanks for your responding, but i need the analtical solution not numerical . could u solve it again

diff(x1(t),t)+x1(t)+0.03x2(t)+0.01y1(t)+0.02499y2(t)+.009y3(t)=0

diff(x2(t),t)+0.833x1(t)+0.69985x2(t)+0.13745x3(t)+0.02499y1(t)+0.06245y2(t)+.00227159y3(t)=0

diff(x3(t),t)+0.109073x

## Linearize and extract the linear matrix solution...

Hey,

I have linearized the following system and I want to extract the linear matrices (a,b,c,d) form the solution. The program is as follows:

## Extract linear matrices from StateSpace...

Hey,

I am trying to linearize a Statespace and extract the linear matrices from the solution. Using following example, can you explain how to extract the matrices a,b,c,d.

## how do i solve the systems of differential equatio...

hi

would u please to help me in solving this system of this equation.

diff(x1(t),t)+x1(t)+0.03x2(t)+0.01y1(t)+0.02499y2(t)+.009y3(t)=0

diff(x2(t),t)+0.833x1(t)+0.69985x2(t)+0.13745x3(t)+0.02499y1(t)+0.06245y2(t)+.00227159y3(t)=0

diff(x3(t),t)+0.109073x2(t)+0.195455x3(t)+0.00909y

## Maple kaplan-yorke...

Hello,

I am wrting a program to generate the kaplan york map,

i am suppose to ouotput a sequence of x,y points

I have written my program, but am having a hard time getting the map.

In my program i return x[n],y[n].

After i read my program into  maple, what commands do i use to produce the map?

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