## polynomial from list of coefficients...

is there any way of creating a polynomial in maple from a list of coefficients (i could write my own function, but this is annoying, no?). specifically i would want an inverse to the PolynomialTools:-CoefficientList function, f([1, 2, 3]) would yield me 1 + 2*x + 3*x^2. i cant understand the apparent lack of such an elementary function, i must be missing someting? thanks

## Two plotting queries...

Hiya,

I have two questions...
Firstly when plotting a graph in Maple using plots[display]({A1,A2,A3}), is there anyway to switch the horizontal and vertical axes such that f(z) is on the horizontal axis and z along the vertical?

Secondly, I'm trying to plot a sum at various times t,

c(z,t)
:= Sum(A[n]*Phi[n](z)*exp(-lambda[n]*t), n = 1 .. 10)

## Fitting Imported data to a Gaussian distribution...

I several peaks from emission spectra which I am trying to fit wit a Gaussian distribution.

y = y_0 + A*exp[-{(x-x_0)/(width)}^2

The problem I am running into is I am getting fits which are wrong.  Maple returns:

fit_658 := 1.+1.*exp(.50000000000000*(z-1.)^2)

The correct answer is:

-7e05+2.7e06*exp(((z-656.1)/9)^2)

Also, I am interested in finding the deviation in the parameters which are found.

## How to translate from Maple to Maple TA?...

I know how to solve a problem in Maple, but can't translate into Maple TA. I'm teaching elementary statistics, and want students to estimate a median using a cumulative frequency distribution.

In Maple, I randomly generate some intervals and frequencies. Then I define the CFD by giving the end points and the cumulative frequency, like;
(1) XY:= Array([[x0,cf0],[x1,cf1],[x2,cf2],[x3,cf3],[x4,cf4]]);

## Symbolic Vector Manipulation...

I would like to do something like a derivative with respect to a vector or really anything involving a vector (not of a known length or known values) going in and a vector coming out:

diff( Transpose(x) * A * x, x)

Is this possible?

It's just that it is very different if you do x*(x+1) if x is a vector or if x is a scalar.  Does this make sense?

Any tips would be great!

Thanks,

Dave

## A random boolean that has a chance = p of being tr...

Hello,

I have another question. I would like to construct a code, demonstrating the loss of information when sending codewords.  Usually, one assumes that each entry of the codeword has a chance equal to p  (like p=0.17) of being incorrectly sent.  How can I have such a random element in my code?

Thank you,

fredbel6

## Goldstein Classical Mechanics "Special Relativity"...

The question is,

A particle in hyperbolic motion starts from the origin at t = 0.  Find the time t[0] such that if a photon is emitted from the origin after t[0], it will never catch up with the particle.

Anyone familiar with this text, or who has gone through it formally please help.

Starting to get  really agitated, and don't know where else to turn to.

Thanks,

very respectfully,

(forgive the ranting).

## Fonts in plots...

I have a 2D and a 3D plot which are close together and I would like them to have a similar look. However, when I set the caption with:

caption=["whatever text I want here", font=[HELVETICA,BOLD,12]]

I get what appears to be different fonts on the two plots.

Any suggestions as to whether I am doing something wrong please?

(And does Maple not allow me to use any font I want?)

Many thanks

Karina

## Trying To Install A User Defined Package...

I downloaded John Fredsted's Gravitation code from the Maple application center, and now I'm trying to get it to be a package.

However, I'm having trouble doing this.

Can anyone help me get to the point where I can access this application as any other manufacturer produced package using the with command ?

v/r,

## easy way to do it?...

Hey

I was discusing Maple and Matlab with one of my friend.

He said that in Matlab he can do

a:=1:12

b:=sin(a)

plot(a,b)

that's easy in matlab to do so

i use

> ptlist:=NULL:
> for n to 12 do
> ptlist:=ptlist,[n,sin(n)]:
> od:
> plot([ptlist]);

do to so

is there any easy way to do that in maple?

like creat a sequence from 1 to 12? ( besides seq(n,n=1..12))

thanks

## how will maple response to non-unique solutions??...

dsolve( {diff(x(t),t)=sqrt(x(t)), x(0)=0}, x(t));

use the theorem to test the ODE ,the solutions are unique

however maple gives me a unique solution?

## Multiple answers in Matrix type questions...

Hi

I'm currently trying to write a matrix question. My problem is that the answer can take to forms. I can use a maple graded question to exect both answers but am having trouble when it comes to using a 'matrix; type question. It there a way to get the matrix question to accep the both answers or has it got to be done with a maple graded question.

Regards

Jim

ps below is the text file it needs to saved and then uploaded.

qu.env.validTest=

false