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I'm trying to do this project but I keep getting an error message...does anyone have any ideas???


I find it much easier to enter equations in the Text mode (red bold text). In the past I found a UI setting that allowed me to stay in this mode, but now I can't remember where to find the every time after I input a command, the next command is back in Math mode by default. How can I make it stay in Text entry mode all the time?


March 12 2009 Deadstar 192

Hello, I have a function that produces different phase portraits as you change the variable x in the original equation. Im trying to find out at what values of x this change occurs...

So far I have determined the eigenvalues with regards to x and have run loops to find out roughly when this happens but i would like to be able to do this with either a procedure of perhaps dsolve or solve maybe?


So, given the eigenvalues, how would i go about doing this?

For a matrix W, the command limit(W^t,t=infinity) does not work.  Is there a way to evaluate this limit in maple ??

I knew that fsolve can solve equations by given an interval or a starting point. Like these

fsolve({x-y = 1, x+y = 1}, {x = 0 .. 1, y = 0 .. 1})

fsolve({x-y = 1, x+y = 1}, {x = 0, y = 1})

But what if I knew the interval for only one of the the variable?  After I run this code

subset of s...

March 12 2009 sansar 72

S={v1=[-4 v2=[7 v3=[-3 v4=[-6 v5=[1 }
           -2       1        3        -6       3
           -1      -2        0        -1       4

Is there a way to check a function for positive definiteness or local
positive definiteness?

Eg:  v(x1, x2, t) = (x1^2 + x2^2)*exp(-t)


please help me here:

we have the following series:

1/2-Pi/(4*sqrt(3)) = sum(1/((6*n)^2-1), n = 1 .. Infinity)


(5-Pi)*(1/4) = sum((-1)^(n+1)/(2*n+1), n = 1 .. Infinity) {***}


-1/5+(1/6)*Pi-(1/12)*sqrt(3)*log((2+sqrt(3))/(2-sqrt(3))) = sum((-1)^n/(6*n+5), n = 1 .. Infinity)


  Dears,  I'm using Maple 11.   In math mode, I want to input  a notation with a line or tilde above it. But I don't know how to do it. And I need some help.

integration with maple...

March 11 2009 Lonely 390

please help me here:

i have :


how do i find:


i think its value is pi^2/4

suppose if we also have

g(x):=arctan(cos(2 *x))+Pi/(4):

how do we find:

int(g(x)-h(x), x = 0 .. Pi)




I have got the following problem:

my data is stored in 3-dimensional arrays but I need my data as Vectors in order to call the function FourierTransform.

Right now I transform it by hand like this (my data is stored in the 3-dimensional array fArray):



March 11 2009 kristide 32

I'm using Bodeplot comando:


This gives three grafs in the plot.

Do anybody know how I can get Maple to add up the grafs into one graf?



I'm a Maple newbie and I am struggling to figure out how to compute the following:

1) Jacobian of a time dependent function:

For example I have a vector Phi = (x1(t),x2(t))
and I wish to compute the Jacobian of this vector with respect to x1(t) and x2(t) and I want to maintain the explicit reference to these entries as time dependent components.

What I can do:

I'm using fsolve to solve a system of two equations with two unknown variables. Like this,

fsolve({u(b) = z(b-a), u(a) = Zeta1(a-b)}, {a = -.2, b = .2}).

As we know, the solution shows like this:

{b = .2189682330, a = -.1937146254}

I am trying to solve the following function for 'r' and 'theta' at various values of 'a' and 'zeta' in order to detemine the saddle points (r,theta). I have tried the following and it works fine! However, the process takes quite a long time. I was wondering if there is another method...say Newtons Method or otherwise to go about solving the two simultaneous equations (eq1,eq2) for (r,theta)?



a:=1: zeta:=1:

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