November 28 2007
hakon 28
Hi,
I'm trying to solve a set of simultaneous equations, and the solutions I get are expressions of _Z. I'd be most grateful if anyone could explain what this means.

How would i go around solving these equations?
1.) **5(7y+3)=39**
2.) **20(21r+40)=100**

(I think this was posted in the wrong section of mapleprimes.)
Hi,
I have read the manual on saving to a file many times but it never works for me.
I am using Maple 10 on a Mac running MacOS 10.4.10.
I have copied the example from the manual and run that and it does work so I am quite confused.
Here is what I would like to do: I have a worksheet with lots of definitions,equations, lists, etc. and I would like to have these available on another worksheet. I have tried
> save nx; # nx is the name of my worksheet
then
> read nx;
Error, unable to read `nx`
I have the same problem with trying to save names e.g.

Hello.
I'm having a problem graphing the following parametric equations in 3d , together:
x=1-2*t
y=-t
z=3+t
and
x= 5+3*s-4*t
y=7-5*s-5*t
z=-2-s+6*t
Thanks, excuse-me my English, I’m foreigner

November 15 2007
pippo 24
hello to everyone! I have a problem with the maple toolbox for matlab: i can't use the command setmaple to move my equations from matlab to maple. An example: i create two symbolic variables in matlab
>>syms x y;
then i set:
>>cos(x+y)
ans =
cos(x+y)
and now i try to move the equation to maple:
>>setmaple ('h',ans)
??? Undefined function or method 'setmaple' for input arguments of type 'sym'.
i'm using maple 11.01 and matlab 7.4.0. I tried updating toolbox for matlab but it didn't work. Some suggestions? Thanks...

Show that an n x n unitary matrix has n^2 - 1 independent parameters. {Hint: Each element may be complex, doubling the number of possible parameters. Some of the constraint equations are likewise complex and count as two coordinates.}
Next Question:
The special linear group SL(2) consists of all 2 x 2 matrices (with complex elements) having a determinant of +1. Show that such matrices form a group.
{Note: The SL(2) group can be related to the full Lorentz group in Section 4.4, much as the SU(2) group is related to SO(3).
Taken from "Mathematical Methods For Physicists", Arfken and Weber.

hi
i know a little bit about maple, i am able to input commands for it to solve non-power series equations
but i do not know how to input commands for solving equations involving the Sine Integral fucntion, Si (x)
thanks in advance

I am trying to gain some experience in maple coding, frankly I'm terrible so a tutor has kindly set me some tasks. He wants me to write a procedure for solving any tridiagonal system of equations. Here is his brief:
Write a procedure to solve a given tridiagonal system of equations. Use lists to input the coefficients and do NOT use matrices and/or Maple arrays. The procedure can then be called at every time step. This will also be more involved.
After a bit of research I know this is the starting matrix:
b1x1 + c1x2 = d1
a2x1 + b2x2 + c2x3 = d2

The following system of equations can be solved by Maple 9.5 and Maple 10, but either takes a long time in Maple 11 or else simply won't solve. Is anyone else experiencing problems with the solve command? Earlier I noticed that Maple 11 was returning duplicates in solutions, but this is more serious. We tried this system on Maple 9.5 and Maple 10, and it solves easily, but on two computers with Maple 11, in classic worksheet mode, minutes went by with no solution.
{2*a[2,6]*a[2,9]-2*a[2,8]*a[2,9], 2*a[1,5]*a[3,1]+2*a[1,7]*a[3,1], 2*a[2,6]*a[3,4]-2*a[2,8]*a[3,4], 2*a[1,5]*a[2,1]+2*a[1,7]*

Several weeks ago I submitted a request titled "Plot This! - Elliptic Integrals", which Dr. Robert Israel responded to with the following code which successfully plots the relationship of two variables, beta and k, over the range of interest.
> with(plots); Digits := 15;
> implicitplot(2*EllipticE(sin(beta), k)-EllipticF(sin(beta), k) = tan(beta)*sqrt(1-k^2*sin(beta)^2), k = 0 .. .99, beta = 3.5 .. 5.5, view = [0 .. 1, 3.5 .. 5.5]);
However, the plot indicates that for the range of k=0..0.99, beta is approximately equal to 4.77 radians (273 degrees), whereas the paper that I am researching indicates a value of beta equal to 257 degrees 28 minutes. I have attached worksheet that includes the commands provided by Dr. Israel for information.

Hi everyone.
Does anyone know how to derivate such function:

piecewise(t
and avoid in result: Float(undefined) in points where function is not continuous. You can see what I'm writing about in file

trajectory I appended.
The problem is that I have a big simulation of constrained robot and I need to derivate my equations which are not continuous and I cannot change it.
Thanks for any help.
Piotr
P.S. I forgot to write I use MAPLE version 8

Hi all,
My question is:
**WHY** is underscore (_) used to represent subscripts of parameters in equations? This is what i observe in most of the maple documents/worksheets from the application center.
Why isn't the math form (Shift + _) used? The subscript can also be represented as, for example, k[1] in the text form.
Any particular reasons?
AKS.

I am just starting to work with Maple 11, and having problems plotting two (single variable) functions in the same set of equations. I had **thought** that the way to do this was to plot a function, create a second expresssion in Math mode, and then simply drag the expression into the plot area. What happens is that the expression disappears, and nothing happens to the plot.
when I use plot**({expression1,expression2}) **, the plots appear just fine.
Are there any tips for me? I'm trying to write an "introduction to Maple" for beginning Calc I students, so I want to be able to give them the simplest instructions possible.

Hello,
I am using dsolve to solve a set of coupled differential equations. After they are solved I do some further manipulations on them. Every time I restart maple and execute the document, maple solves the equations but puts them in a different order and has the constants mixed up. Thus I have to keep hitting the (!!!) button until I happen to get the solution I had when I did the further manipulations. Is there a way to proscribe maple's output to a certain order? Here is an example:
One time the solution will look like:
{F(x) = f(x)*_C1 + g(x)*_C2, G(x) = m(x)*_C3 + v(x)*_C4}

Hey everyone, I have a system of equations that is kind of complex, and would like to create a generic solution for it, but I am not sure if this is possible. I have 6 equations, and only 4 unknowns. These equations are describing a physical system, so there is a solution to the problem, and will always be a solution given the imputs from the physical system. All of the equations are of the form:
A+B*Sin(theta1)+C*Sin(theta2)+D*Cos(theta1)+E*Cos(theta2)+F*Sin(theta1)*Sin(theta2)+G*Cos(theta1)*Cos(theta2)+H*Sin(theta1)*Cos(theta2)+I*Cos(theta1)*Sin(theta2)=J+K*Sin(theta3)+L*Sin(theta4)+M*Cos(theta3)+N*Cos(theta4)+O*Sin(theta3)*Sin(theta4)+P*Cos(theta3)*Cos(theta4)+Q*Sin(theta3)*Cos(theta4)+R*Cos(theta3)*Sin(theta4)