How I can say that an object,say k, is a constant(it may be positive or negative) inside assume()?

assume(k::??should I say)

pls also tell me what kind of help pages I should see for this kind of "type inside assume()" problems. 

Thanks.

I'm working on a mecanic's problem and I need to solve a differential equation:

I want to determine x(t) and plot it... 

This is the way I do it: 

with(Physics):with(combinat):
comn := choose([u, v, mu, nu], 2):

def := seq(seq(seq(Physics[`.`](Dagger(Ket(aa, k)), Ket(bb, m)) = Physics[`.`](Ket(bb, m), Dagger(Ket(aa, k))), `in`(aa, comn[i][1])), `in`(bb, comn[i][2])), i = 1 .. nops(comn)), seq(seq(seq(Dagger(Physics[`.`](Dagger(Ket(aa, k)), Ket(bb, m)) = Physics[`.`](Ket(bb, m), Dagger(Ket(aa, k)))), `in`(aa, comn[i][1])), `in`(bb, comn[i][2])), i = 1 .. nops(comn));
Setup(def):

d1 := Physics[`.`...

I was recently browsing the Wolfram website, in particular the Online Integrator, and was very impressed that they are exposing a part of their product for free public use. I also noticed that they offer the option of submitting previously unknown anti-derivatives to them:

(From the FAQ page, http://integrals.wolfram.com/about/faq/#8)
“If you think you have a...

I have three different matrices, say A(3x6),B(3x6) and C(3x12) with the size of each matrix mentioned within parenthesis. I want to define a fourth matrix D (6x12) so that D=[A,B;C] (in Matlab notation). Can anyone please tell me how to define this D in Maple? Maple help seems not that helpful at least for beginners like me. Thank you in advance.

what is the command to change transfer matrix to state space?

When I enter the Greek Capital letter "Xi" (looking like three uneven horizontal lines) it comes up fine on screen but in print preview there is a space?  Lower case "xi" is fine.  Same thing happens in both Maple 14 and 15.

Hi everyone,

Is there a way that Maple can return a list of variables in a function? For example, if I have something like:
f:=(x,y)->x^2+y^2;
I would like Maple to return:
{x,y}

I found the indets command, but it does not seem to work for functions. For example:
f:=x^2+y^2; indets(f);  returns {x,y} but     f:=(x,y)->x^2+y^2; indets(f);    returns {f}

Any help would be appreciated.

I am looking for an way to do clifford and geometric algebra calculations with Maple.

Robert Israel helped me to plot  F2 vs k 

http://www.mapleprimes.com/questions/120380-Explicate-Plotting

I tried to modify his code to get reults for F2 vs S from equation A1, but i am still facing problems with it

The maple code is

restart:with(MultiSeries):with(plots):

parvalues:={C=2.02,H_liq=8.74,R=22.11,R1=0.0006};...

Hi,

I encountered the following problem in Maple 14

expr1:=sqrt(a)

assume(a>0)

expr2:=sqrt(a)

additionally(a>1)

subs(a=2,expr1) #gives correct answer of sqrt(2)

subs(a=2,expr2) #does not substitute a=2 in expr2

It seems the last statement with expr2 does not work as expected, I wondered why this behaviour is so, because it does work with expr1. The added assumption does not invalidate the first...

Hi guys,

I am a first time user of Maple. I have a very easy question to ask you people since I am not that great in programming.

Below is a system that I want to evaluate. I just want to know how can I find out expressions of w1 and w2 in terms of u1 and u2 only i.e. w1=f(u1,u2) and w2=f(u1,u2). I don't want other variables like delta or E in expressions of w.

Thank you.

Hi,

where can I look up, how Maple calculate the function MathieuExponent. By how I mean, which algorithm is used by Maple and how is it implemented,

Thanks

restart:with(MultiSeries):with(plots):

parvalues:={C=2.02,H_liq=8.74,R=22.11,R1=0.0006};

G:=R3*k*(1-R1)/(C*Pec_i);

F1:=1/(R*S+1-S);

F:=F1*(1-R*G*S);

F2:=Pec_i*F;

A1:=Theta0/C=(exp(F2*(1-S))-1)*(H_liq+1/(1-exp(-C/k*F2*(S))));

R3values:= [0,-1,-3,-4]; colours:= [red,blue,green,black]; display([seq(plottools[transform]( unapply([k, subs(parvalues, Pec_i = -20, R3=R3values[i], F2)], (k,S))) (implicitplot(subs(parvalues,Theta0=4,R3=R3values[i...

Hi,

I need to solve the following system of equations:

eq1 := (vi-vg)/Z0 - (vg-vs)/Z1-(vg-vd)/Z2;

eq2 := vs - [(vg-vs)/Z1 + gm*(vg-vs) + (vd-vs)/r0]*Z3;

eq3 := (vg-vd)/Z2 - gm*(vg-vs) - (vd-vs)/r0 -vd/Z4;

I am expecting the solutions for vg, vs, vd, so the following command was used:

solve({eq1,eq2,eq3},{vg,vs,vd});

but it kept giving me the warning message of: