eqn1:= 1.x+1.y+1.z=0

eqn2:= a.x + b.y + c.z=0

eqn3:= b.c.x+c.a.y+a.b.z=1

When I try to solve this system of equations as:

solve( {eq1,eqn2,eqn3},{x,y,z} )

I get the message "Warning, solutions may have been lost"

Can you please help me to solve these equations and express my solutions in "factored form" ?

Dear all,

I would like to solve the following equation (linearized Poisson-Boltzmann in 2D) in Maple:

diff(u(x,y),x,x)+diff(u(x,y),y,y)-k^2*u(x,y)=0;

subject to the boundary condition:

u(x,a*cos(bx))=0 and  u(x,y)|y->infinity=0

(a,b and k are parameters)

I succeed to get the solution with pdsolve, my problem is how to solve the boundary condition problem.

Thanks!

Gurus...

Any idea why I get the "Parts of the expression are ambiguous. Please select one of the suggested meanings." alert on some of this code, but not other parts? I want them all to be "table assignments" not "function definitions" (per my options in the window). I would really like to not have it keep asking me the question on each run, so is there a way for me to be more specific? Thanks in advance!

Fred

deq(i,XMethanol):=M*diff(X[i](t),t)=(L*(X[i-1](t)-X[i](t))+V*(Y[i+1](t)-Y[i](t)));

deq(i,XWater):=XW[i](t)=1-X[i](t);

I have these 3 equations i am trying to rearrange into real and imaginarry parts. This is pretty easy execpt I am unable to rearrange C(k) into real and imaginary parts.

C(k)= H₁(k)/ (H₁(k) + iH₀(k))

Is it possible to solve piecewise equations in maple? All I get is 'warning, solutions may have been lost'.

solve((piecewise(x<0,x,x>=0,x^2)=0));

Thanks.

I want to plot the normal vector of the Mobius strip represented by the parametric equations:
x=(2+u*cos(v/2))*cos(v):

What could be done with a module whose ModuleLoad routine redefined itself?

Could such a routine do some action, and then cover its tracks effectively by overwriting itself?

Would there be any way to use march() to examine the .mla archive member, in which that ModuleLoad routine is stored, without accessing the name of the module? Presumably any invocation of the actual module name would result in its being accessed from the library and hence trigger its ModuleLoad routine.

I am trying to evaluate the hypergeometric function : hypergeom([1],[1.5],-z) where z is in the order of 1e-6. Its taking very long time where as if I use maple through matlab, then its quite fast !!. Evaluation of Gauss-hypergeometric functions for the similar arguments in maple is quite fast.  Is there any trick I can use for the fast computation of the confluent hypergeom in the case above?.

Thanks for any help

Maple's foldl and foldr procedures provide a convenient means to generate an n-ary function from a binary operator. For example, from another thread, one can use foldl to create an n-ary and procedure from Maple's binary `and` function:

Good evening everyone

I am trying to solve this new problem the whole day up till now and as it is getting very late, I thought asking someone smarter than me might help in the end.

What I experience at the moment is that a written program of mine, as given below, works pretty well, when I set Digits to 10 or less. 100000 loops are not a problem. Yet, as soon as I start increasing Digits to values greater that about 15, my program crashes after about 100 loops. I can see what is happening: The RAM (2GB), is full.

I was wondering how you would convert a number to a Mayan number using Maple11.

I have the expression

(r(r+(1/2)*s))(sin(t)/(r+(1/2)*s)+(diff(y(x), x))/(r^2+(1/2)*rs))

and I want to obtain

r*sin(t)+diff(y(x),x)

I tried expand,collect,combine without success.

Hopefully I missed something and there is a simple solution.

Thanks in advance.

                                       Sandor

I have been reaading previous posts on plotting Dirac functions; in particular: Plotting the Dirac Function and How do I plot Cos(w*t) in frequency domain?

I'm doing a series expansion of complicated expressions using Maple. How can I limit the number of terms, and not the order of the series? To be more precise, I need the series up to x^2, but when I ask for series(expr,x,3) I get terms of x^(2.5) which I don't need. How can I get rid of them without dropping the x^2 terms? series(expr,x,2) truncates them.

Thanks a lot to whomever can help!

Hello Maple experts,