We have an automated grading system and sometimes students assign values to variables that are useful in grading their assignments. In order to get around this I've been tinkering with the anames() command (specifically, anames(user)), but I cannot seem to get a usable list of "in use" variable names: Every time I try to get Maple to use the list that anames(user) returns, I get the evaluated variable and not the variable name.
Example:
>a:=4;
>anames(user)[1];
4
Does anyone know how I can get a usable list of variable names that have been assigned values?

Hello Maple insiders, I'm still learning to get along with Maple (version 10.01). Currently, I would like to have a small procedure which creates a random matrix of arbitrary dimension with complex floats. However, the generated matix, say A, has to fulfill the following conditions (because it should be a valid physical density operator): 1.) A is hermitian 2.) A is positive semidefinite, together with 1.) this should mean that A has only real and nonnegative eigenvalues 3.) A should have trace equal 1 With the randomly generated matrices I would like to cover (reasonably uniformly) the set of all possible matrices with the above constraints.

Hi,
I would like to be able to plot a 3d surface of one variable, with another variable in colour on that surface. This plot should have a legend for the colour variable.
At a stretch, I would also like to have all of this in polar co-ordinates, with polar axes and without having to write a transform myself.
Is all this possible!
cheers

Hi,
I am using the global optimization toolbox to minimize a matlab function as follows:
restart;
> (Matlab:-evalM)("cd 'C:/Documents and Settings/user/Maple'");
> mat2map1 := proc(a, b)
local Res,res;
Matlab:-setvar(\"a\",a);
Matlab:-setvar(\"b\",b);
Matlab:-evalM(\"result = mat2map1(a,b)\");
Res:=Matlab:-getvar(\"result\");
res:=convert(Res,float);
return res;
end proc;
> with(GlobalOptimization):
> infolevel[GlobalOptimization] := 3:
> GlobalSolve(mat2map1, a = 0 .. 5, b = 0 .. 5);
When I run this I get the following error message:

Hi! I am trying to convert an entire Maple worksheet into Fortran code. At the moment, I have managed to convert a specific program using with(codegen): f:=proc(x) function end proc fortran(f) But this method can only convert one function at a time. Can someone please help me to convert an entire worksheet into Fortran or other languages? I have text and math in my worksheet, and I'm using 2D math in Maple 10. Thanks :)

Is there a way to track a thread without responding to it?

I have two small questions: 1. Given a list L: L:=[false, false, true, true, FAIL,false]; and I want to get the positions of "FAIL" (in this case 5) and false (1,2,6). HOW could I get that? 2. Now, given another list Z with the same number of elements: Z:=[z1,z2,z3,z4,z5,z6]; I would like to replace the values of FAIL by 0 (zero). (in the way that Z became: Z:=[z1,z2,z3,z4,0,z6];) It is possible to do that without using "for do" commands? Thanks in advance, JJacques

Does anyone know if it's possible to discover the largest known prime number just using Maple 10 on a stand alone machine (PC)? Or does Maple 10 and or all of it's current additions / upgrades lack the computing power required to attempt this possible recreational task ? v/r, Dan

Hi dear Maple's gurus.
I have the lists a and b:
a:=[A, B, C]
b:= [[K1,L1][K2,L2][K3,L3]]
I want to add the each term of "a" in the intervals given in "b":
sum(A from L1 to K1)+ ..+sum(C from L3 to K3).
I tried with this procedure:
> sums:= proc(a,b)
local j,tot;
tot:=0;
for j from 1 to nops(a) do
tot:=tot+sum(a[j], k=b[j,2]..b[j,1]);
end do:
end proc:
>sums([a1,a2,a3],[[ku1,kl1],[ku2,kl2],[ku3,kl3]]);
1. Is there some more efficient way to do the same?
2. I would like also that the sums on a[j] under the following 2 join conditions:
2.1. assuming that a[j] is real and positive, and

Hi there! Assuming that I have the following fraction: fr1:= (x+1)/(x-1); I have the following 2 questions: 1. with which command could I take only the numerator "(x+1)"? (and for the denominator?) 2. Is it normal that whattype(fr1); returns a star * Thanks in advance for your answers, Jean Jacques

Simple question: I can't seem to use a negative number as a minimum value for a slider control (in Maplet Builder)...
Is this not possible?
Thanks!
Bryan

Hello, I am relatively new to Maple and using version 9.5. Does anyone out there know of a way for symbolic characters such as Pi to appear in a plot title? This is the input I am working with. f:=x->piecewise(x < Pi/3,4*sin(x),Pi/3 <= x,x^3-x+1); plot (f(x),x=-Pi..Pi,discont=true,title="f(x) [-Pi, Pi]",titlefont=[TIMES,BOLD,16]); Any help would be greatly appreciated. Thanks

i got the solution of a ODE system (dsn), the results are time dependent variable theta[i](t),and its deriavtives diff(theta[i](t),t). and i have one set of expressions, which are explicit form of theta[i](t),and diff(theta[i](t),t), such as ss[1]:=fx[1]=sin(theta[1](t))*3+cos(theta[1](t))*diff(theta[2](t),t). I want to put the solution i got into the explicit expression of fx[i], and then polt them, how can I do it? i use eval(ss[1],dsn)but it does not work. here is the code:
> restart:
interface(warnlevel=0):
with(SolveTools):with( plots ): with( plottools ):
with( DEtools ): with( PDEtools ):
g:=9.81:
x[0][2]:=0:
y[0][2]:=0:
#initialization function of each beam,in this function, we should give 3 variables, n=the number of this #beam, la=the length of this beam, ma=the mass of this beam
beams:=proc(n,la,ma)
global l,m,x,y:
l[n]:=la: #length of beam n
m[n]:=ma: #mass of beam n
#initialize the positions of each beam
x[n][2]:=0: #the x position of the end point of each beam
y[n][2]:=0: #the x position of the end point of each beam
x[n][1]:=0: #the y position of the center point of each beam
y[n][1]:=0: #the y position of the center point of each beam
end proc;
#define the forces that applied on the end of beam n
Force:=proc(n,fm,fn)
global fx,fy:
fx[n]:=fm:
fy[n]:=fn:
end proc:

when i do this loop for i from 0 to 10 do f(i) mod 11; end do; it only outputs the last value, ie f(10) mod 11 i want it to output all of them, what is going on here?

Hello, contourplot can be given a list of contours levels or a integer specifying the number of evenly spaced contour levels it should plot. In the second case, or even in the default case, is there a way to know what these contour levels are? The legend only shows Curve1, Curve2, ... but to which contour levels do these curves correspond? -- Thanks in advance, Franky.