One of the items missing in the "combinat" package is that there exists no procedure to produce one combination at a time from C(n,k). The only possibility is to generate a list of all possible subsets of C(n,k) in a single go.

I am looking for a function/library to generate sequences of combination C(n,k), which would generate the next (successor) sequence, given a sequence. ie next:=some_proc(n,k,prev) should return the next sequence after the sequence "prev". Is this available anywhere ?

I have problems with assume integer. Here is a worksheet yielding a wrong solution.
Is there something other than assume(integer)?
> restart:
> assume(k,integer);
> is(k,integer);
> is(l,integer);
> t1:=int(sin(x)*sin(k*x),x=0..Pi);
> t2:=int(sin(x)*sin(l*x),x=0..Pi);
> limit(t2,l=1);

I want to create a list and apply sin(x) to it. Is there something that can help me do the following....
Apply sin(x) to a list as in...
sin[2, Pi, Pi/3]
Please let me know.

In a new PC with a nVidia graphics card under Win XP Pro I have found that

plots, using the Classic interface (Maple 8 included), show a cyan background

by default, instead of white. Default means PlotBGColor=default or 255 255 255

in maple10.ini.

Clicking with the mouse on the plot turns the background white, both for

inline and window output, but e.g. using the window output, and pressing the right

arrow turns the background cyan again.

On the other hand, plot background in Standard interface shows white.

I have not realized of any other application showing this problem.

Any idea on its origin?

New here and not sure if this is where the bugs go. Assuming it is...
Using Maple10, build 190196 and Linux; entering the following
>map(Im,Matrix(1,1,shape=identity)):
gives back 1x1 identity matrix (that is, [1]). Fixed by
>map(Im,1.*Matrix(1,1,shape=identity)):
which returns [0.], as it should.
Cheers

I am trying to solve the following system in (L,N) with Maple
eq1 := 449.7102399/(L-115.6885356*N^.98*L^1.019)^.1*
(1-117.8866178*N^.98*L^.19e-1)+15-5894.330889*N^.98*
L^.19e-1-411.72/(48-L)^.6e-1-985.8471121*
exp(-3.638-.174*N)/L^.326 = 0
eq2 := -50985.79270/(L-115.6885356*N^.98*L^1.019)^.1/N^.2e-1*
L^1.019-5668.738244/N^.2e-1*L^1.019+254.5065245*exp(-3.638-.174*N)*
l2^.674 = 0
I have tryed with solve(),PolynomialSystem() but without any result. I have also tryed with implicitplot() to have an approximate solution.
I would be v grateful for any help.
Cheers,
g

Hello,

when using the graphical version of Maple 10 on Mac OS X, I frequently get problems when entering content or changing it. I start by entering content, and all works fine. Then I execute the worksheet, save the worksheet, and all is still fine.

Then I restart Maple and open the worksheet again. Now I want to change some content. But when I press shift-enter to insert a line, it does nothing the first time, and only works from the second time on... when browsing with the arrow keys, it seems like there is some sort of hidden character inserted, as I need to press the left key twice to go over it.

I'm converting an expression to optimized Matlab code, and some key parentheses were left out of the final expression. Is this a known bug? I'll include the offending code below:

W1 := (-5+6*b*c*d^2+5*a*b^3*c*d+5*a*b*c^3*d+a*b*c*d+a*b^3*c^3*d-2*a*b*c*d^3-4*a*b^2*c^2*d-b^4+6*b^2+6*c^2-c^4+4*d^2-2*b^2*c^2*d^2-3*b^2*c^2+3*b^4*c^2+3*b*c+3*b^2*c^4-5*b*c^3-5*b^3*c-b^3*c^3-4*d^2*b^2-4*d^2*c^2+8*a*d-8*a*d*b^2-8*a*d*c^2)/(-2*a*b*c*d+2*b*c+2*a*d-c^2-b^2+d^2)^(7/2)/(-d+2*a);

with(CodeGeneration);

Matlab(W1,optimize);

I get a final expression of

t72 = t32 + t57 / t65 / t63 / t62 / -d + 2 * a;

Could somebody send me a Maplet to solve
systems of equations of any range ( linear,exponential , logarithm
My e-mail is :
javi36@ono.com

I am trying to calculate deflections of a beam (under their own weight) on multiple supports with a (nonsymmetric) overhang on either end.
I've done the calculations by hand but would really like to write something in Maple to do it as I have alot of configurations to calculate. Can anyone help or give me some suggests?
The way I have calculated the deflections involves calculating the reaction forces on the beam. Then calculating at general points along the beam. Integrating to give the bending moment M. Setting boundary conditions (such as M=0 at ends,M=M at supports etc). Then the deflection of the beam is given by y=(W/IE)*int(int(M)) subject to boundary conditions (y=0 at supports y'=y' at supports) where W=Load per unit mass, I=second moment of area E=Young's Modulus.

I would like to know how to tell Maple not to assume that two things commute, that is, AB != BA. I would like to be able to have maple expand expressions such as

(A+B)^2 = A^2 + AB + BA + B^2

instead of having it collect terms and ignore the multiplication order as it does when I use the "expand()" function.

Need to solve the following equation for real roots:

x^4 + 5*x^3 + 4*x = sin(x), with Digits:=6

it is giving me only one real root, but during the plot it shows two intersections suggesting two real roots. How can i overcome this problem?

What is the latest version of Maple 10 available? ( as in 10.x)

i am trying to solve:
L_fire_7 := 0.5*trans_7 * p *((2 * h * c^2 / (lambda_7)^5) * (1 / (exp(h*c/(k*lambda_7*T)) -1))) = L7;
L_fire_21 := 0.83*trans_21 * p *((2 * h * c^2 / (lambda_21)^5) * (1 / (exp(h*c/(k*lambda_21*T)) -1))) = L21;
for T and p using PolynomialSystem. the result contains _X. i have no idea what that symbol means and can't find anything in the manual nor on the web.
any help is highly appreciated! (also in regard to how to solve this better than using PolynomialSystem).
-florian

I have written a relatively large simulation in Maple10 and it is literally taking forever to run for any decent size and time. I have been trying to convert to C to run in C, which became a serious problem, then I tried to use "compile" which again was very problematic.
They seem to work only when the code is written in a C-like format anyway, in other words to use of lists and very fussy with arrays and procedures within procedures seems to create problems.
I just wanted to ask if there is something clever I can do, to convert my procedure (there are about 20 of them) and if there is certain rigorous formatting I can do without having to literary re-write my whole code, as that is the way it seems now.