MaplePrimes - Questions and Posts tagged with equations

eliminating noise

farazhedayati — Sat, 19 May 2012 08:11:16 Z

I have 10 equations and the summation of them will give me the answer but each of them have small numeric noises and the sumation of them makes the final result inaccurate. For example the first equation is

over defined problem

farazhedayati — Wed, 16 May 2012 20:02:29 Z

Have to solve and ODE in the domain of [-infnity +infinity ] via specific analytical method but due to some restrictions it could not be solved. In order to solve it, I have separated the domain into [-infinity 0 ] and [0 infinity]. So, I have to add some boundary values at x=0 to the problem. Assuming the solution of the mentioned ODE in [-infinity 0 ] is g(x) and in [0 infinity] is f(x), I added the boundary values of f(0)=g(0)=a and f ' (0)=b and obtained f(x...

Blank Equation Extraction of Op Amps in MapleSim

Onnimikki — Fri, 11 May 2012 09:56:10 Z

I am trying to extract the underlying equation for a simple operational amplifier circuit in MapleSim 5. The same process that I had used earlier for a simple resistor circuit (without opamp) worked fine and yielded equations. However, when I try to do the same thing with an opamp (configured to do a simple amplification of an input voltage) I get a blank "View Core Equations" box in the Equation Extraction attachment.

Thanks!

How to make Maple understand a parameter which can assume only the values -1 and +1?

rickrsv — Thu, 10 May 2012 01:34:07 Z

Hi,

I am working with equations on Maple which depends on a parameter (epsilon), which can assume only the values +1 and -1 (I intent to replace this value only in the end of calculation). When, however, Maple computes the expressions, the result contains severals powers of epsilon, for instance epsilon^7 or epsilon^4. Since actually we have that epsilon^7=epsilon and epsilon^4=1, respectively, it would be very usefull to me if Maple

Has Maple failed to solve my system of equations?

naffal — Tue, 01 May 2012 18:07:58 Z

Hey Guys,

I'm trying to solve a system of 5 linear equations to get 5 unknowns:

Solve the system of equations

toandhsp — Tue, 01 May 2012 14:21:30 Z

I can not solve the system of equations

restart;

eq1:= x^4+2*(3*y+1)*x^2+(5*y^2+4*y+11)*x -y^2+10*y +2=0;

eq2:=y^3+(x-2)*y+x^2+x+2=0;

solve([eq1=0,eq2=0],[x,y]);

Please help me. Thank you.

how to solve these pdes numerically

faisalnoufaey — Tue, 24 Apr 2012 03:07:37 Z

Hi every one, plz can anyone solve these equations numericallly by maple:

Equation substitution problem

Ronan — Mon, 16 Apr 2012 22:22:58 Z

I have a set of test equations. I am substituting the coefficients of the variables A₁ ..A₄ and the constants in the equations. Most of this I have made work fine. There are 2 coefficients I cand make be substituted. In eq₁ k*d the coefficient of A₃ and eq₅ 3.1d² also the coeff of A₃ .Have tried subs and algsubs but can't make it work. The reason I want to do this is in reality I have 15 equations...

Error, (in D/procedure) index out of range: function takes only 1 arguments.

adgoodies — Sun, 15 Apr 2012 08:15:07 Z

aim: To solve the van der pool DE assuming pertubation expansion

How do I determine the general solution of the system of differential equations

Helbo — Sat, 07 Apr 2012 13:26:17 Z

I need to determine the general solution of the system of differential equations.

System of equations:

dx/dt = 2x-2z

dy/dt = 2y+2z

dz/dt = -2x+2y+4z

Thanks for the help!

How do I solve the following system of differential equations?

docoi — Thu, 05 Apr 2012 20:52:33 Z

Hey there i try to solve this system of equations. It is required that the left side of the equation only take positive values. Has someone an idea to fix this solution or has maybe another idea to help me.

> m[1] := 30; c[1] := 48000; c[0] := 20000; d[1] := 21; d[0] := 70;

> DGL1 := m[1]*(D(D(x)))(t)+d[0]*(D(x))(t)+d[1]*(D(x))(t)+c[0]*x(t)+c[1]*x(t)+50000 = -(1/1000)*c[1]*S-(1/1000)*d[1]*DS*((1/60)*(2*Pi*250))-(1/1000)*m[1]*DDS*((1/60)*(2*Pi*250))^2;

Plotting non-linear differential equation

snehalele — Tue, 03 Apr 2012 23:49:45 Z

Hello,

I'm new to Maple and am using it to solve linear and non-linear differential equations.

I can solve and plot linear DEs using a couple of methods. Im trying to solve a non-linear DE and i could find the series solution using dsolve. But given certain initial conditions, is there any way to plot or see the nature of the behaviour of the DE? I just want to see how the DE will look like maybe for certain points up to a certain level of accuracy. Is there any way to do that?

forming a matrix multi-variable names in nonlinear equations

Ronan — Thu, 22 Mar 2012 17:26:28 Z

I have a set of multi variate polynomial equations. I need to setup a matrix [G][x]=[Θ] Θ is a function of c₁ and c₂ up to 4th order terms

My problem x=[c₁⁵, c₁⁴c_{2 ,}c₁³c₂², c₁²c₂³ , c₁c₂⁴ , c₂⁵] these 6 5th order terms...

How do I solve the following system of equations?

KateXX — Wed, 21 Mar 2012 12:01:03 Z

Hello,

Could you please help me with the following system of equations:

> restart; with(student);
> Z[0] = 377;
> solve({Z = 1/(j*w*C[1]+1/(j*w*L[1])+1/R)+1/(j*w*C[2]+1/(j*w*L[2])), C[1] = w[c]*(w[0]^2-w[c]^2)*(w[2]^2-w[1]^2)/(2*Z[0]*(w[1]^2-w[c]^2)*(w[0]^2-w[1]^2)), C[2] = w[c]*(w[0]^2-w[c]^2)*(w[2]^2-w[1]^2)/(2*Z[0]*(w[1]^2-w[c]^2)*(w[2]^2-w[c]^2)*(w[2]^2-w[0]^2)), L[1] = 1/(w[1]^2*C[1]), L[2] = 1/(w[2]^2*C[2]), R[1] = subs(w = w[1], 2*Z[0]*(1-S[21...

Equate the coefficients

Ronan — Thu, 15 Mar 2012 21:09:50 Z

I have 2 equations for example

A xyz+B xy^2z^2 +C x^2yz^2+D xyz^2 +E z+ F = G xy+H xy^2+M x^2y+P

I need to equate the coefficients.. Now by inspection equating like powers of x and y

G=Az+Dz^2

H=Bz^2

M=Cz^2

P=Ez+F

How can I get Maple to do this?