When I use PDEtools in Maple10 to get subscript notation of derivatives it works for equations that are assigned to another variable name. It does not work for equations that are referred to only by their Maple10-generated equation numbers. The sample case below shows the problem. It is an edited Maple-text version. I tried uploading the file, but neither Live Worksheet or HTML copy correctly display. Live Worksheet apparently doesn't access PDEtools, and the HTML copy can't handle equation number references. I can supply the test file to any one who wants it.
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Iam a Student in the faculty of engineering Petroleum department.
Iam Studying Oil Reservoir Simulation which havs many models.
Iam Studying the mathematical modeling of those reservoirs.
In this modeling we use PDEs to model that reservoir behaviour for years
we devide the reservoir into grid blocks each of its special dimensions and parameters
so for each grid block there are 3 phases which are oil, water, and gas equation (one for each phase of them)(Matrix Dimension = No. of phases * No. of grid blocks) in addition to the other parameters
there are some elements of the PDEs which is function in more than one parameter

Hello all!
I need to solve multivariate polynomial equations modulo a positive integer 'm', where 'm' is not prime. Which function would be best?
Also, how do I include constraints to the above set of equations? For instance, if I need to solve for 'x' and 'y' such that
f(x,y) = 0 mod m
g(x,y) = 0 mod m
f != g mod m
Any help would be great!!

hi, I have a big problem with my project. I need a help with solving and plotting three differential equations but I can´t do it. The project is about lotka-volterra system with three species, 2 predators and 1 prey with no competition between predators. Thanks for a help.
eqPrey := diff(X(t), t) = alpha1*X(t)*(1-X(t)/K) - beta1*X(t)*Y(t)-gamma*Y(t)*Z(t);
eqPred1 := diff(Y(t), t) = -alpha2*Y(t) + beta2*X(t)*Y(t);
eqPred2 := diff(Z(t), t) = -alpha3*Z(t) + beta3*Z(t)*Y(t);

I got this problem from my proffesor :
*Provide a MAPLE procedure which plots ANY curve C given by a pair
of Cartesian implicit equations { f(x,y)=0 & g(x,y)=0 }, without
plotting as well the two surfaces ( f=0 and respectively g=0 ),
which provide C by their intersection (just the curve C has to
appear as output). Do NOT attempt to parametrize the curve; use
the MAPLE plotting functions for Cartesian plots.
Example: C: { x^2+y^2+z^2-1=0 and z=0 } is a circle in the xOy
plane;
plot the circle, but not the sphere or the plane which provide C.
*

hey :)
i have a set of equations on the form in the example below. i included my attempt at a solution which, as you might suspect, does not give me the answer on the form i want.
what i want is to solve this assuming that the coefficients for each term in the polynomial of u and v sould be equal.
eq1 := a1*u^2 + (a4 + 3 + 2*a6)*u*v + a3*v^2 + (a1 + a2 + a6)*u + a5*v + a6 = 5*u^2 + 7*v;
solve(eq1, {a1,a2,a3,a4,a5,a6});
this example would for example have the solutions:
a1 = 5
a2 = -5
a3 = 0
a4 = -3
a5 = 7
a6 = 0
but if you type the code ive written into maple, youll see thats not what i get at all :)

I wonder if someone could help explain to me how to use Matrix equations. Suppose A is a 3x3 matrix of constants, b a 3 vector of variables (x,y,z) and c a 3 vector of constants. The equation A.b = c is really 3 equations in x y z. Is it possible to extract those equations from the matrix equation A.b = c? I explain my question more clearly in the uploaded worksheet.
Thanks
The link can be found in the

File Manager
Vie

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Hello,
I'm trying to export a worksheet in LaTeX format. It gives me a .tex file which requires a package maplestd2e.sty (not maple2e.sty) which I don't have. I found a file called maple2e.sty at http://www.maplesoft.com/support/downloads/latex_patch.aspx and it works up to a point. Firstly I had to change the output tex file to require package maple2e.sty and more importantly it has equations running off of the edge of the page.
Please help,
Regards,
A. Carmichael

Hello!
I upload my file which has a problem. I am not an expert
on MAPLE v10.05. The file name is "mapleprime-2".
I try to get a solution of four equations with the
symmetric assumption for time variables. Anyone could
change the assumption to get a result. Or, anyone could
add just two more time variables: t[6] with minus sign
amplitude and t[7] with plus sign amplitude.
So, the entire number of time variables are still
odd number which can not be changed. The current code is
following as:
restart:
eq1:=expand(sum((-1)^(i+1)*cos(w*t[i]),i=1..5)=0):
eq2:=expand(sum((-1)^(i+1)*sin(w*t[i]),i=1..5)=0):

I would like to know how to print a matrix using the TextBox command from Maplets, because always print a message "Matrix(3, 3, [ [ 1,1,1],[1,1,1],[1,1,1 ] ], datatype = anything, storage = rectangular, order = Fortran_order, shape = [])", for example.
Another doubt is if it's possible to print text and equations using the MAthMLViewer without erasing the previous print in the Maplets (to each program output a line is added in the MathViewer).
I would be grateful for any hint.
Adriene Pfeifer
restart:with(LinearAlgebra):with( Maplets[Elements] ):
test:=proc()
local M;
M:=Matrix(3,3,1);

hello?
I wrote the following equations to be solved.
restart;
eq1:=expand(sum((-1)^(i+1)*cos(omega*t[i]),i=1..5)=0):
eq2:=expand(sum((-1)^(i+1)*sin(omega*t[i]),i=1..5)=0):
eq3:=expand(sum((-1)^(i+1)*cos(r*omega*t[i]),i=1..5)=0):
eq4:=expand(sum((-1)^(i+1)*sin(r*omega*t[i]),i=1..5)=0):
t[1]=0;t[4]:=2*t[3]-t[2];t[5]:=2*t[3];
_EnvAllSolutions:=true:
_EnvExplicit:=true:
s1:=solve({eq1,eq2,eq3,eq4},{t[2],t[3],r});
Do I have to specify t[3]>t[2], t[2]>0 in the code?
where t[1] to t[5] are time variables starting from t[1]=0
and omega and r are constants.
How can I get the solutions for t[2] and t[3]?

how do i solve a set of coupled differential equations like these
for x(t) and y(t)
eqn1 := (D,2)(x)(t) = -a*sqrt(D(x)(t)^2+D(y)(t)^2)*D(x)(t),
eqn2 := (D,2)(y)(t) = g-a*sqrt(D(x)(t)^2+D(y)(t)^2)*D(y)(t)

i'm trying to solve a set of coupled differential equations and need help
eqn1 := (D,2)(x)(t) = -a*sqrt(D(x)(t)^2+D(y)(t)^2)*D(x)(t),
eqn2 := (D,2)(y)(t) = g-a*sqrt(D(x)(t)^2+D(y)(t)^2)*D(y)(t)