Items tagged with equations equations Tagged Items Feed

Suppose I have a system of three coupled equations as:

eqn[1] := a*x+b*x^2+c*x^3

eqn[2] := a1*x+b*x^3

eqn[3] := a2*x^2+b2*x^3 = a*x^2

If I simply write

eqs :=( eqn[1], eqn[2], eqn[3])

the equations get coupled.

1. Can I do it using loop structure?

2. Secondly, after coupling suppose I want to collect coefficoent of x, x^2 and x^3 from three equations ang get the equation in form

eq[0]:=a=0,a1=0

Hi everyone.

I have a doubt:

On the example at "kinematic exports help", the position constrain equations are not the same as the one made by hand. In fact, they should be as:

l1·cos(theta)+l2·sin(beta)-s = 0

l1·sin(theta)-l2·cos(beta) = 0

I know that a bit difference might be due to de sector of the angle beta. However, what I cannot undestand is why the term "s" appears multiplying to "cos(theta)" in the example.

Can anybody please help me?

Regards.

Hello, everybody! I can`t solve these equations. Please, help me! Thanks...

x=a*sin(k*z)±W/2;

k=2π/λ, λ=10000, a=3000, W=500;

and

x=z*tan(θ)-d*cos(θ);

θ=π/6, d=0..100;

Hi and thank you for looking.

I have recently begun advanced maths and need help with maple. Is it possible to input an algebra equation and have maple rearrange it to make it a different subject?

I am new to maple and maths again so any help much appreciated. 

Also can maple for example if I input 6 equations could it or is there a way to get maple to pick two like equations out of them.

Thanks again, Danny 

Hello .

I need your help please .

how can i solve this kind of equations like : 61*a^2+1=b^2

Hi, i'm fairly new to maple and i'm trying to create a list of equations to solve but I can't see where I'm going wrong.

I am trying to solve a system of nonlinear 36 differential-algebraic equations numerically in Maple. The last line of my code is the dsolve(.) command which is used to solve the DAE system. My problem is that it takes forever to evaluate the dsove(.) command. Maple does not give me any errors/warning, however, it keeps evaluating, and evaluating...nothing happens...

I have used stiff solvers as well hoping to make the process faster but that dowsn't work either.

Hi,

Im trying to evaluate a Transfer function from a block diagram.

i have written all the equations but i cant find the command to find the symbolic solution

of theta_l/Theta_d in terms of A,B,C,s,Kp,Kv

attched is the maple file.

i use maple 13.

• prepratory_1_seonc.mw

Hello there,

When I was trying to solve a differential equation with dsolve, I've got such a error report:

> dsolve({Q(0) = F[Az], diff(Q(x), x) = q[2](x)});

Error, (in dsolve) found the following equations not depending on the unknowns
of the input system: {Q(0) = -(1/4)*l^2*q[0]-(1/4)*l^2*q[0]*exp(2)+F}

But if I only write:

> dsolve(diff(Q(x),x)=q[2](x));

then there is no problem. 

Dear all,

I'm currently facing the following problem. I am trying to solve an expression for 4 variables: Fe11, Fe12, Fe21, Fe22. Actually these variables come from a 'deformation gradient tensor' Fe that is used in continuum mechanics.  This tensor actually appears in two equations in tensor-form. Since these tensorial equations contains 'inverse' and 'transpose' operators, the only thing I could think of to solve for a particular tensor (Fe), is to do this component-wise....

> eqns := {(x[1]+1)^2+y[1]^2 = (x[2]-1)^2+y[2]^2, (x[1]-c[1])^2+(y[1]-c[2])^2 = (x[3]-1)^2+y[3]^2, (x[2]-c[1])^2+(y[2]-c[2])^2 = (x[3]+1)^2+y[3]^2, y[1](x[3]+1) = y[3](x[1]+1), y[2](x[3]-1) = y[3](x[2]-1), (x[2]-c[1])(y[1]-c[2]) = (x[1]-c[1])(y[2]-c[2])};
print(`output redirected...`); # input placeholder
 /          2       2            ...

Hello,

I am very new to maple. I am trying to determine x, y, z and the intersection the following tori:

((x * cosθ _j+ y * sinθ_j -r)² + (x * sinθ_j - y * cosθ_j -r)² + z² + a² - b² )² - 4 * a² * ((x * cosθ _j+ y * sinθ_j -r)² + z²) <= 0

for j = 1,2,3.

Hello,

I set up 8 equations systems with 8 variables (multivariate polynomial equations, which are product of maximization problem with budget constraint). The equations are set as eq1, eq2, etc as attached in the file. However, the  "fsolve" function can't give me any solution. Can someone recommend me a way that will solve the equations.

 model_4_countries_03.mw

I'm looking for a simple way, e.g. a function, to convert a system of symbolic equations in its matrix form.

Like

(a+1)x - by + cz = j

2x  + (sqrt(d)+e)y - fz = k

(g-h²+1)x - iy - 4z = l

shall be transferred to matrix / vector form

A . x = b

where A i the matrix of the coefficients, x i the vector of the variables (x,y,z), and b is the right-hand-side vector (j,k,l).

The number of equations...

Hello,

I am trying to solve a system of six equations with the command solve. Unfortunately I only get the message "Warning, solution may have been lost". If i try to solve only five equations, i get an answer, that could be right.

My questins is: Is there a mistake in the syntax of solve? Or, is my equations system wrong?

Thank you!!!

Maple code:

> restart;
> FZ := 0 = FLZ+F11Z+F12Z+F21Z+F22Z+F31Z+F32Z;