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Hey Guys,

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

well first of all this site was very useful for doing my homework, but there is still something I didnt find on it and im sure other people may find it useful.

I have a system of 5 ode's and 6 initial conditions that ive solved successfully and plotted the graphs i need:  Position VS Time

          Speed VS Time

The only thing I initially know is the final position, which i can read on the first graph and...

Good Morning.

I have a problem

i have two functions

> xcir(t):=0.3 + 0.15*sin(t):
> ycir(t):= -0.3-0.15*cos(t):

and i suppose that i have a problem in the following equation

> qd2 := ((arctan(-ycir(t)/xcir(t))-arctan(.45*sin(qd3(t))/(.45+.45*cos(qd3(t)))))*180)/(3.1416);
> qd3 := 180*arccos((xcir(t)*xcir(t)+ycir(t)*ycir(t)-.45*(2*.45))/(.45*(2*.45)))/(3.1416);

Good Morning.

I have problem when i want to graph my equations. I received this error: 

Error, (in plots/odeplot) curve is not fully specified in terms of the ODE solution, found additional unknowns {t}

I would like to know how i can solve it

Thanks in advance 
 

I have just tried to solve for 2 equations in 2 unknowns. The 2 equations are very non-linear. I know for a fact that there are 2 solutions as I can draw the curve, but for some reason and for some parameter specifications Maple will only give me 1 out of the 2 solutions. I use the following:

Solve( [eq1,eq2] , [x,y])

Thanks in advance,

Christian

Hi,

I need to find the eigenvectors of this matrix and get the following error:

> eigenvects(A);
 linalg:-eigenvects called with arguments: [[200, -96, 5, -4.4, 4.7, -12.6, -6.2], [-96, 320, 33.1, 6.8, 4.5, 7.4, -.3], [5, 33.1, z, -51.1, .8, -8.4, 7.6], [-4.4, 6.8, -51.1, 110, -76.6, -14.2, -67], [4.7, 4.5, .8, -76.6, 270, 78.3, -.1], [-12.6, 7.4, -8.4, -14.2, 78.3, 420, 38.3], [-6.2, -.3, 7.6, -67, -.1, 38.3, 230]]
 #(linalg:-eigenvects,7...

as you know the number of solutions for order 3 to 5 magic squares is as follow : 
(not counting rotations and reflections)

order 3: 1 solution

order 4: 880 solutions

order 5: 275305224 solutions

higher order: unknown ...

in the first look at 880 , simply appeared it can constructed by
2x5x8x11 (every factor increased by 3)