Math Forum / Math Software / Maple / August 2004

Hi, all, when I make a color contour plot, such as
plot3d(f(x,y,z),shading=zhue), how could I add a color bar to this pic?
Thanks!
Regards,

I have often had a system of equations with some number of unkowns.
When I tell maple
  r:= solve(equations, unkowns);
where equations is a set of equations and unknowns is a set of unkowns,

according to the following example ":=" or/and "assume" work dependent
on the number of cycle. Is it OK?
restart;
interface(showassumed=0);

i am new to Maple and i could not find any references explaining how
to solve the following problems with maple.
Find an element r that belongs to the finite field F_3^{3*n}, where n
in my case is 97, that solves the equation: r^3+2*r+2 = 0

In Maple (I have tried versions 7 and 9, which are the only ones readily
available to me, but a friend tells me this is also the case in 9.5), I
get the following result:

I am using maple with environment variable
               Digits 30
Does anybody knows if this accuracy carries to the calculation of the
"elementary functions" e.g exp(x) (ie when I calculate exp(x) do I

I need a table over two variables n and k
that shows values of
The varibles are connected in a sum with
an auxiliary condition as shown in this link:

Immediately after starting Maple 9.03, type:
evalf[14](arctan(387.00000001642));
and get: 1.5682123532178
The correct 19 digit value is: 1.5682123532178(50715)

With a plots[contourplot3d] plot, I can use the mouse to add contour
lines and to patch the surface.  However, reexecuting the command
means I have to use the mouse again---a nuisance.  What is the proper
option to add to the command

Maple 9.01 (linux i386) cannot compute the rank of some zero matrices. Is
there a fix available? Do the 9.02,9.03 updates also change the math or
only the interface part? (I'm not root, so I cannot try myself).
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Has anyone had experience (good or bad) with Maple after installing
the new Windows XP Service Pack 2?  One hears rumors of possible
incompatibility with various software.
Robert Israel                                israel@math.ubc.ca

Here is something I would like to understand:
The simple system
    {a1*a2 = r1, a2*a3 = r2, a3*a4 = r3, a4*a5 = r4, a5*a1 = r5}
in the variables

i have posted a bug in the new overload feature of Maple 9.5 a few weeks
ago. (btw thanks to Helmut Kahovec for his idea for a workaround) Now i
discovered two (or one, i don't know if they have the same origin)
further bugs concerning this feature - which make the workaround ...

How do I solve the following equation for g in maple?

When I try

Does anybody know what (in Maple 9.5) may cause the following
message: "Error, (in Optimization:-LSSolve) could not transform
problem to floating-point Matrix form" ?
Before applying a 'change of coordinates' it worked (but gives