The problem I'm having is that I have a large system of linear equations, the solution to which I know must be integers between 1 and 9. I have tried applying bounds etc., but the problem is that when I use solve, it said 'evaluating' for around half an hour, and still came out with nothing. Does anyone have any ideas as to how to make this faster, because I suspect that it's trying to find all solutions, and then eliminating the ones of the wrong form, rather than only looking for solutions where each variable is an integer between 1 and 9.

Hello Maple experts,

I'm currently trying to get more familiar with semidefinite programs (SDP), i.e. I want to minimize/maximize a linear objective matrix function over linear equality/inequality constraints with a positive semidefinite matrix condition.

It seems that there are a number of Matlab packages available but so far I couldn't really see how I could do this with Maple (which I would prefer to Matlab if there is a reasonable solution...)

I am in a mode with a red arrow on the left.

How do I define f to be an algebraic function of x over C, the complex numbers, such as

f(x)=x+7+I

I want to be able to plug in complex numbers for x and have a complex number

returned, say

f(9-5*I)=16-4*I

Is there a way to change the background color of a plot viewing area different from the white?

Thanks!

Hey,

I am trying to animate this code, I have a loop that makes a matrix of random numbers
 

with(RandomTools):for i from 1 to 20 do
>   for j from 1 to 2 do
>   p[i, j] := i+Generate(float, 0..1);
>   od;
> od;   
 

and if I try to plot the following this works such as

points:= {seq([p[T,1], p[T, 2], T],T=1..20)};
pointplot3d(points, symbol=box);

This gives me all 20 points on the plot

Hello,

I am trying to do some basic plots with maple, but when I plot them they look strange and do not look like they should, what am I doing wrong?

The plot I tried to do is:

plot(cos(20*Pi*t), t = -5 .. 5)

I am having this problem with most of the plots I try to do, they do not come out symmetrical and have strange anomalies in them.

Thanks,

Hi all,

I have the following function:

phiS := (C,q) -> w*(int(a*f*g(x), x=0..a*f) + int(x*g(x), x=a*f..((w+pi2)*q-pi2*C)/w) + int(q*g(x), x=((w+pi2)*q-pi2*C)/w..infinity)) - s*q - pi1*(f-C) - pi2*int((C-q)*g(x), x=((w+pi2)*q-pi2*C)/w..infinity);

when I type the command:

simplify(diff(phiS(C,q),C));

I get the correct output (I've differentiated phiS on paper): pi1- pi2*int(g(x), x=((w+pi2)*q-pi2*C)/w..infinity);

***************

Is it possible to write questions of MapleTA just from maple 11?

I mean, I know is possible to write questions and export them to Maple T.A. but every "execution group" will be a diferent query for the maple and setences like

RandomTools[Generate](integer(range=0..4));

will return always the same number, an i cannot use sentence like parse(time) because parse is restricted.

Thanks.

When I solve the equation like so;

fsolve(x^3-6x^2-7x+58=0) I get an answer in real numbers

and when I solve the equation like this;

solve(x^3-6x^2-7x+58=0) I get an answer in complex numbers.

How is it possible that when solving the same equation I get two different answers one with real numbers and the other with complex?

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 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