## Solve(eqn, a) only provides one solution........

Hi all,

Im trying to use the solve command to solve the eqn:= 40 = x arccosh(56/x) for x. The command solve(eqn, x) only provides the left solution(for low values of x) while I know there must be a solution as well for higher values of x. How can I get Maple to look at the other solution?

## I dont get the solution with RootOf(_Z)...

Hi everyone, Im trying to solve a catenary problem. x is defined in terms of y1, y2, and a. But in my case a is the only unknown. I try to express a in terms of x, y1 and y2 by the following script:

`> x := a*arccosh((y1+a)/a)+a*arccosh((y2+a)/a);                      /y1 + a\                 /y2 + a\       a arccosh|----------| + a arccosh|--------|                      \  a   /                    \  a   /> solve(x, a);      ...`

## Animate..Display...

I want to animate the display of a polygon. It's the platform of a stewart gough rig. Have 200 poses stored as Platformi i i=2..200. the Base is static( obiviously). Haven't been able to figure out how to get    animate(display .....) to work. The work sheet just contains copy/pasted commands. The time period for the animated display is about 10 seconds but real time is not that important. How do I get this to work?

## Error in BooleanSimplify( )...

Hello everyone,

I have been trying to use MAPLE 16 for Boolean algebra computations. BooleanSimplify( ) command in Logic-Mathematics is giving me incorrect results, in the following code:

with(Logic):

f:=(not(x1)and not(x2) and not(x3)) or (x1 and x2 and x4);   #Create a 4 variable function f

g:=((x1 and x2) or (x2 and x3)) or (x3 and x4);    #Create another 4 variable function g

f2:=f &or g;

f3:=Canonicalize(f2,{x1,x2,x3,x4},form=DNF...

## Why CTRL+Insert and SHIFT+Insert don't work in Map...

Hi:

For many reasons, until recently, I have been always using Classic interface under Maple through Maple 16. When trying Maple 16 with Java interface I have noticed several quirks which were not present under the Classic interface of earlier versions through (at least) Maple 13. One of them is this:

The shortcut keys such as CTRL+Insert and SHIFT+Insert do not work and I am forced to use a mouse and copy/paste icons in Maple. This really slows down my keyboard...

## solve two coupled equation...

Hi

I want to solve the equation of

F'''(x)+F(x)*F''(x)=0

with the following  boundary conditions

F(-5)=F'(-5)=0

F'(5)=0.14

for solving it numerically in the computational domain of [-5...5]. I have seprated the domain into two parts and the governing equation and boundary condition in each domain is assumed as follows

g'''(x)+g(x)*g''(x)=0
g(0)=alpha
g(-5)=0
g'(-5)=0

## PNG export using "plotsetup(png,...)" has an...

by: Maple 16

When using "plotsetup(png,...)" the third rotational angle is ignored.  Attached are a worksheet and the corresponding three plots that demonstrate this bug.

## Obtaining power of a function x+y...

Dear everyone,

Hello,

I have a question about how to get the power 'n' in an expression "(x+y)^n". For instance, I have a Maple code

******

eq1:=4*x^n*y^m+(x+y)^n+x^3;

f1:=map(t -> `if`(match(t = c*y^d, y, 's'), subs(s,d), NULL),
convert(eq1, list));
f2:=map(t -> `if`(match(t = c*x^d, x, 's'), subs(s,d), NULL),
convert(eq1, list));

## Bug in PolynomialIdeals

by: Maple 16

Hello,

I am experiencing wrong results using the PolynomialIdeals package in Maple 16 (see radical_error.mw). Creating the same ideal with different generators, the radicals computed differ which of course is wrong:

with(PolynomialIdeals);
J := <t*(a+A), A*(b+B+t), b*(a+A), B*a-A*(b+t), (variables = {A, B, a, b, t})>:
J2 := <t*(a+A), A*(b+B+t), b*(a+A), B*(a+A...

## readdata from a file with word and data...

Hello everyone,

I have a file, e.g.'helloworld.txt'. It cotains

hello 3 5 7
world 1 2 6

If I use

print(L1);

I just got a "[]"

How can I get the data from the file which has many word?

Thank you very much in advance

## Importing a MATLAB mat file...

When I use ImportMatrix to import a MATLAB mat file, I get a list of names and values. Should I write a "for" loop to assign them in Maple or there is an easier way to do it?

## Plotting trajectories (orbits) upon bi matrix data...

I have got the following instructions of computing the required trajectories (orbits). They have been done with Maple V3. I cannot get them going with Maple 16. I have just started with Maple and cannot see the mistake in the instruction. Can anybody help me? Thanks!

> with(LinearAlgebra);
> "A, B = Payoff matrices for players";
> A := matrix(2, 2, [4, 2, 1, 3]); B := matrix(2, 2, [1, 4, 3, 2]);
> "T defines the time interval [0,T], s is the step length";

I have written a (rather extensive) module, which I can load without problems if I run it in the following way:

`restart: libname:="C:\\PathToLib",libname; with(NameOfLib);`

Note that the above is all in one line and executed at once. If, however, I load the library like above, but line by line, the loading fails, giving the error "Error, Did not recognize this structure's syntax".

How can there be a difference...

## solve simultaneous eq...

Hi, I would like to solve for i and c in this system. But whenever I try to solve it, it give a warning message "the solution may have been lost"

eq:={rho*(psi*i+psi*epsilon*c)*(1-i-phi*((`&vartheta;`+mu)*(mu+delta)*(1-i-c)-beta*c*(`&vartheta;`+mu)-xi*i*(mu+delta))/((`&vartheta;`+mu)*(mu+delta)*(phi+omega+`&epsilon;`*psi*i+`&epsilon;`*epsilon*psi*c+mu))-c-(tau*`&vartheta;`*xi*i+beta*c*`&vartheta;`+beta*c*mu)/((`&vartheta;`+mu...

## solution of ode with zero boundary condition...

hi

consider the following ode

eq1:=diff(f(x),x\$3)+f(x)*diff(f(x),x\$2)+diff(f(x),x\$1)^2;

subject to thease boundary condition

f(a)=0,D(f)(b)=0,D(D(f))(0)=0

where

b= infinity (in computational domain b=10 is acceptable )

the exact solution of ode is

f(x)=tanh(x/2)

but when i want to solve it with Dsolve, maple get the zero. how can i use this ode in maple

thanks

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