Hi Guys i need some Help. 

I created a work sheet where i am calculatin the polynominial coefficient of an equation. The Problem is that if i take these coefficient and then calculate the root with Matlab and compare it with the symbolic toolbox  i get wrong roots. My question now is did i something wrong by creating the coefficient ? 

Polynom_Calculation.mw 

These are the values for the parameters : 

b1=0
b2=0
v1=0
v2=0
s1=0
s2=0.175
j2=0.28
tau =20
th1 = 0
th3 = 0
 

i added  my Maple skript. i hope that sb can help me.

Hi Guys :)

I need some Help with solving a nonlinear system. 

I have 3 equations.

These 3 equations have 7 unknown variables in it. But 5 of them are constants which I don't want to solve. I just want to solve three of them.

I tried it with fsolve but I always get the error :

fsolve({eq1, eq3, eq5}, {a, b, c});
%;
Error, (in fsolve) {eq1, eq3, eq5} are in the equation, and are not solved for

i tried to define the variables as Parameters but then i get this error: 

Parameters(t1, t2, t3, t4, t5, t6, t7, b1, t, v1, v2, s1, s2, j, a, b, c);

fsolve({eq1, eq3, eq5}, {ca, cb, cc});
%;
Error, (in fsolve) {b1, eq3, eq5, j, t, t1, t2, t3, t4, t5, t6, t7} are in the equation, and are not solved for

Here is the script : Non-Linear_system.mw

 has sb an Idea?