## Problem collect with distributed ...

Hello,
the following command

`collect(c4*dnub*kpbr*ksr*nur*nurdel + c4*dnur*kpbr*ksr*nub*nurdel, [nur, nub, dnur, dnub, nurdel, nubdel, dnurdel, dnubdel, c4], distributed)`

returns

`c4*dnub*kpbr*ksr*nur*nurdel + c4*dnur*kpbr*ksr*nub*nurdel`

However, I am expecting it to return

`c4*kpbr*ksr*(dnub*nur*nurdel+dnur*nub*nurdel)`

Where is the error?

## Coefficients of expressions...

Hello,

Lets say I have an expression

f:=(a+b)*x1+(a^2+b^2)*(x1+x2^2)+c*(x2-x3)*a*b

and I have a list

p:=[a+b,a^2+b^2,c*b*a].

How can I get the coefficients of the element from p in f, ie,

cof=[x1,x1+x2^2, x2-x3].

such that cof[i] corresponds to p[i]?

## How do I remove these unwanted trailing zeros from...

How do I remove these unwanted trailing zeros from my plot ? I have tried setting striptrailing=true from the Tyesetting package but no difference. Thanks

## extract solution for each to excel file...

how can i extract solution for each GB to excel file

 (1)

 (2)

 (3)

 (4)

## How to use the Liebniz notation in a complex expre...

Hi

I would like to use  the Liebniz notation that someone from the technical support posted here
Writing Derivatives at a Point Using Leibniz Notation
to display a formula that is not just a partial derivative but a more complex expression invoking partial derivatives.
Typically an expression like this one:

2*(Diff(f(mu__1, mu__2), mu__1))^2*lambda__1^2-(Diff(f(mu__1, mu__2), mu__1))^2*mu__1^2+2*(Diff(f(mu__1, mu__2), mu__2))^2*lambda__2^2-(Diff(f(mu__1, mu__2), mu__2))^2*mu__2^2+2*(Diff(f(mu__1, mu__2), mu__1))*(Diff(f(mu__1, mu__2), mu__2))*lambda__1*lambda__2-2*(Diff(f(mu__1, mu__2), mu__1))*mu__1*(Diff(f(mu__1, mu__2), mu__2))*mu__2

Could anyone help me to do this?

(PS: I'm still using Maple 2015.2)

## Interfacing maple with gnuplot...

Can I get to know how to interface maple with gnu plot. Thank you.

## comment écrire les composantes d'un vecteur contra...

Bonjour,

Comment écrire les composantes d'un vecteur contravariant avec des indices numériques ? Ce vecteur n'est pas un spacetimevector.

Par exemple : <x^1, x^2,x^3> avec cette écriture maple interprète ces indices comme des nombres et non comme des symboles

Merci pour vore retour

## A problem with integration...

I do a calculation o a simple integral

int(cosh(cos(2*t)), t = 0 .. 2*Pi)

and get the answer 0 (zero), which I know is incorrect. The cosh function of a real argument is always positive.

If I represent the cosh function as a sum of two exponentials

(1/2)*(int(cosh(cos(2*t)), t = 0 .. 2*Pi) + int(cosh(-cos(2*t)), t = 0 .. 2*Pi))

I get

2*Pi*BesselI(0, 1)

which looks much better.

What's the matter? Why Maple yields two different results? Victor.

## Match parameter name of a function...

I'm trying to create an iterator function

Iter := proc(ff, n)
local i,f;
if n = 0 then return (x->x); end;
f := x->ff:
f := apply(unapply(ff))(x);
for i from 1 to n-1 do
f := ff(f);
end;
return unapply(f,x);
end:

This seems to work except that it converts the independent variable to x, which can cause problems.

That is, if I pass something like n->sin(n) then it will output something like x->sin(sin(x))...

Of course, I do explicitly use x but it is because I don't know how to get the input's independent variable.

Ideally I'd like to be able to work on multiple arguments and iterate over the first, by default.

e.g., f#2(x,y,z) = f(f(x,y,z),y,z)

Ultimately the proc above doesn't work well as I want to be able to use it in all contexts(I could pass the value to Iter but I'd rather use function notation.

## How to model a very simple phonetic voice generato...

This must be so complicated process to describe the exact mechanism in human or animals ... and there are many reserchs on web for this subject ! Not expected Large answer !

By this way i am just curious to know by support of signal processing methods available in maple we can model a very basic vibrator as larynx and variable duct (what kind of filter we can call ?) or cavity that play the role of tongue or lips for changing of main stream to made various phonemes or frequencies

Here is a movie that show the section of human vocal system :

Anatomy

## results of minimization iteration ...

is it possible to get all the iteration values for a minimization problem

## How to animate linear transformation of multiple p...

Hey,

I want to animate action of linear transformation on multiple polygons, in the end, it should be a grid of multiple parallel lines that will get morphed. The transformation is defined by a matrix A.

So far I got this code to work:

with(plots):
with(plottools):
setoptions(style=patch,view=[-5..5,-5..5], scaling=constrained):
basis_i:=polygon([[0,0],[1,0]],color=red):

N:=20:
F:=(x,y) -> (1-k/N)*<x,y> + k/N*(A.<x,y>):
L := transform((x,y)->convert(F(x,y),list)):
A:=<<2,1>|<-1,1>>;

frames:=seq(L(basis_i),k=0..N):

display(frames, insequence=true);

It animates the basis vector nicely, but I can't seem to figure out, how to animate multiple lines, multiple polygons.

Anyone knows how to do this?

Any help will be much appreciated.

## Filling Array with Procedure...

I try to fill an Array with a procedure to have pointpairs for a plot. Here is my problem. It doesn't work I wont it to.

Can someone help my please? The first procedure works, I tested it with some numbers, but the second one is the Problem.

## a problem with integration...

Hi dear maple team. i have a question on integration and i need a "real" and "finite" solution with any assumption or options. thanks for the help.

 > restart
 > f := ((1 - a)^2 + a^2*((1 - exp(-y))*(1 - exp(-x)) - 2 + exp(-x) + exp(-y)) + a*(2 - exp(-x) - exp(-y) + (1 - exp(-y))*(1 - exp(-x))))/(1 - a*exp(-x)*exp(-y))^3;
 (1)
 > a := 0.3;f
 (2)
 > s := 2*evalf(int((int(f*exp(-x)*exp(-y), x = 0 .. y + t,AllSolutions)), y = 0 .. infinity,AllSolutions)) assuming real ;
 >
 >

## simple random number construction...

Hello, Probably there is a way to do this easily but I do not quickly find it within the help.

I want

rand(0..1)

to give a true! random number and not always the same number; otherwise it should be called

predefinedlist()

Seed is deprecated, not sure it would help though. So how do I go abouts?

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