I will really appreciate some help with assigning solutions of the solve command to names. For example, when I enter the command...

solve( [3x + 9y=10,8x-7y=20],[x,y])

I get the following output:

[[x=250/93, y=20/93]]

How can I extract the solutions and assign them to x and y which I want to use in subsequent calculations such as ...

sin(x) + sqrt (y)

Hi all,

I am solving a system of ODEs numerically, and then plotting the results over time. I would really like Maple to show me the equation behind the plotted graphs. Through my searches I have not been able to find the code for that. Any help would be greatly appreciated. For example, how do I see the equation for W(t)?

sol1a := dsolve([Eq1a, Eq2a, Eq3a, H(0) = 4879, W(0) = 105000, R(0) = 0], numeric, method = rosenbrock, output = listprocedure)

plots[odeplot](sol1a, [t, W(t)], t = 0 .. 40, color = blue, style = point);

Hi!

I have a system of equations like this:

and I wrote this equations into maple in this way:

eqns := [diff(x(t), t) = -x(t)-y(t), diff(y(t), t) = x(t)+.25*y(t)+r(t), diff(z(t), t) = 3+x(t)*z(t), diff(r(t), t) = .5*z(t)+0.5e-1*r]

using DEplot3d I tried to drawing attractor diagram:

This is my problem:
i've an nonlinear system of six equations and i find the
solution with Runge-Kutta:
for every t>0 i've
x[1](t), x[2](t), x[3](t), xc[1](t), xc[2](t), xc[3](t).
I write this solution in the vector "solution"
> solution:=dsolve(...
Yet i've also another equation ("EQ7") of the type:
EQ7 = f(xc[1](t),xc[2](t),xc[3]) with xc[1],xc[2],xc[3] presents in &q

Hi, all,

I checked all the information of Groebner Basis in maple, and I cannot find how to compute Groeber Basis over Galois Field, for example how to computer Groebner Basis over GF(2^4)?

Thank you.

I'm running OS X 15.5 and have just installed Maple 12. I cannot figure out how to get this thing to launch. If I attempt to launch Maple from the surface in the applications folder, the Maple icon bounces once on my desktop and then -poof-, it disappears.

I have also tried running it from the command line thus and received a permissions error:

dhcp0918:~ emcdowell$ /Library/Frameworks/Maple.framework/Versions/12/bin/maple

-bash: /Library/Frameworks/Maple.framework/Versions/12/bin/maple: Permission denied

and have also tried this:

I use Maple 12 on a Macintosh platform. When I press command+ t I switch to text mode. How do I switch back to 2D math input using the keyboard? Thanks in advance !!

January 22 2009
sbh 72
Hello everyone,

In plotting a function with discontinuities such as y = tan(x), I know that using the plot options "discont=true, scaling=constrained" allows for normal plotting with vertical asymptotes. But how do I do with with plotting a curve given by parametric equations? My curve has a skewed symptote and I can't get my plot to show this. It just "blows up" and the scaling goes to infinity.

Thank you, anyone, for your help.

David

January 21 2009
sbh 72
Hello All,
I read some other posts on "stack limits" and they were not too helpful. In a particular case there seemed to be a bug, as stated by a Maple kernel developer, but I can't imagine that being the problem here. I have a MacBook Pro (Intel) using Maple 11.02 with 2GB of RAM. The following code displays the stacklimit eror causing a failure with the kernel connection whenever I try to simplify the last line. Does anyone have any ideas? Thanks much, Steve.
P.S. Here is the worksheet lines:
restart
one := 1/((x*Dd-x^2*Dcj)*sqrt(x^2-1))

I have two column matrices that I have imported into Maple from Excel (an 'x' and 'y' matrix). The algorithm I am using (that attempts to fit a circle to the data) requires the points to be in an array of the following format:

pts:=[[x1,y1],[x2,y2]...];

How can I run a loop, or other application, to pair the respective pointsto each other in an array such as the one above?

Thanks for any help.

I am looking for some practical advice on how the cool kids split a Maple worksheet across multiple files. I have been reading through the help sections on procedures and modules, but most of the information is for self-contained sections of code in one file. I have come across some info in the help sections on using multiple files, but I am hoping to find out if there is a standard, recommended way of doing this.

How I can write a procedure to explore boolean matrix??

Hi, have a problem with expressions of the following type:
```
-s^3*t^2+t^2*s+t*(1-s*t-s+s^2*t)^(2/5)*(-1+s*t)^(3/5)*(-1+s)^(3/5)*s+s*t+s-1-t+(1-s*t-s+s^2*t)^(2/5)*(-1+s*t)^(3/5)*(-1+s)^(3/5)*t+(1-s*t-s+s^2*t)^(2/5)*(-1+s*t)^(3/5)*(-1+s)^(3/5);
```

Using simplify does not work. However, when I manually collect all terms with fractional powers so that the expression becomes
```
-s^3*t^2+t^2*s+t*((1-s*t-s+s^2*t)^(2)*(-1+s*t)^(3)*(-1+s)^(3))^(1/5)*s+s*t+s-1-t+((1-s*t-s+s^2*t)^(2)*(-1+s*t)^(3)*(-1+s)^(3))^(1/5)*t+((1-s*t-s+s^2*t)^(2)*(-1+s*t)^(3)*(-1+s)^(3))^(1/5);
```

I am trying to extract numerical data from the following plot?
> data := plot({H85, H95, H97, H99}, t = 0 .. 25)
H99 for example is a function like this:
H99 := (0.8375209380e-2*exp(0.9949999999e-1*t)+19.99162479)*exp(-0.9949999999e-1*t)
Could someone please help me out... thanks