hi....how i can extract Coefficients  (i.e. {f1[2],f2[2],f2[3],f3[2],.....f3[6]}) from every algebric equations and create matrix A ,in form AX=0, (X are f1[2],f2[2],f2[3],f3[2],.....f3[6] ) then the determinant of the matrix of coefficients (A) set to zero for obtaining unknown parameter omega.?

Note that  if m=3 then 6 equations is appeare and if m=4 then 9 equations is appeare.thus i need a procedure that works for every arbitary value of ''m''.

in attached file below m=4 thus we have 9 equations, i.e. 3 for eq1[k_] and 3 for eq2[k_] and so on...

also we should use boundary conditions for some amount of fi[j] (i=1,2,3 and j=2,3,...,7)

be extacting above Coefficients for example from first equation ,

''**:= (1/128)*f1[2]*omega^2-(1/4)*f2[2]-(1/2)*f2[3]+(1/4)*f2[4]+(1/4)*f3[2]-(1/2)*f3[3]+(1/4)*f3[4]+140*f1[2]-80*f1[3]+20*f1[4]'''

must compute

coeff(**, f1[2]); coeff(**, f2[2]) and so on...

fdm-maple.mw

Download fdm-maple.mw

Good morning, I'm a student and I installed Maple 18 on my PC, as a "Single User Profile". Unfortunately, I had to buy another computer, so now I'm trying to install the program on my new one. Even if I enter my Purchase Code and my details, Maple says that no more activations are left in my account, even if the expiration date is on March 2020. Is it possible to activate again the program? 

Thank you,

Laura

Hi everybody,

I would like to understand why the instruction

seq(X__k, k=1..2)

returns

X_k, X_k

and not X₁, X₂ ?

Is it possible to force the evaluation of X__k each time k changes in the "seq" loop ?

Thank you for your explanations

It seems as if arrays can only be displayed in 2-D form when the array dimensions start at 1.

Sometimes I want to construct arrays where an index starts from 0 (or other values). This is purely for my convenience in some problems. However such arrays do not display in 2-D form. Consider the displayed form of

Array(1..4,1..5,(i,j)->i+j);

Array(1..4,0..4,(i,j)->i+j);

Why doesn't the latter 'display' in 2-D form?

Hello people in Mapleprimes,

I want to factor

g^((2*(-sigma+k+1))/(-1+sigma))-tau^2

as

(g^((-sigma+k+1)/(-1+sigma)) -tau)*(g^((-sigma+k+1)/(-1+sigma))+tau);

I know that the following code works:

subs(g^((2*(-sigma+k+1))/(-1+sigma))=(g^((-sigma+k+1)/(-1+sigma)))^2,g^((2*(-sigma+k+1))/(-1+sigma))-tau^2);

factor(%);

Isn't there another better way than this?

I will be very glad if you teach me about this.

Thanks in advance.

taro

Dear Colleagues,

I am not sure if there exist a simple way to handle the issues I am facing. I am trying to obtain numeric roots for a polynomial f(x,a). I know for sure that there can be many roots depending on the value of parameter a. However, I cannot say for sure how many roots are possible for each value of parameter a. Some of these roots are complex numbers. Also, I need to choose only those roots that have following properties:

1. They are real.

2. f(x*,a) i.e., function value at a root is positive. 

How do I solve f(x,a)=0 to store all roots in a set? Furthermore, how do I select and print roots that have the properties mentioned above? Is there a way to do filtering of a set specifying properties of the members of the set? Please suggest. Your help is highly appreciated.

Regards,

Omkar

Please help me.I don't know how to achieve the following iteration relation by maple code.

I am a beginer in Maple, and even more beginner with differential geometry on maple. I am trying two dayes now to define the following Lie group on Maple by reading the help guid of DifferentialGeometry and some documents on the web, but I failed. Now I am seeking for your assistance, Plese help me and thanks for being as xplicite as you can.

The group I want to introduce is the real lie group

$ \mathbb R \times \mathbb C $ () equipped with the group law
$$ (x_0,x) \cdot (y_0,y) = (x_0+y_0+\frac{1}{2}Im(x\bar{y}), x+y) $$

(I didn't figure out how to use something other than LaTeX code)

For illustration purpose I am sticking with the above simple example, but I want next to move to higher dimensions analog.
I want also an explication about how Maple distinguishes between a real and complex coordinate.

I want next to compute  the left multiplication pushforward of a tangent vector of the identity.
Then compute the structure constants of the Lie algebra associated. I think Maple can do this kind of manipulation without problem, am I wrong?

hi .may every one help me for pdsolve this differential equations?

all initial boundary condition are zero

thanks...

pdeSol_(1).mw

Download pdeSol_(1).mw

Hello everybody, I'm an engineer student and I'm having quite some troubles with Maple. See my teacher told us to program a homework using Maple, problem is I've never used Maple in my life and it's not that hard, but I'm having some trouble with my homework.

My homework is about a 4-bar mechanism (grashof's condition) which will define the type of movement my mechanism will have depending on the data I input:

we define 4 variables expressed lenght measurments:

L= (largest link in the mechanism) 
S= (smallest link in the mechanism)

P and Q= other 2 links in the 4 bar mechanism

also 

L0: the link of the mechanism which is FIXED (frame)

L1: the link of the mechanism which is moves (driver)

L2: coupler link

L3: follower link

here 1 will be the fram, 2 the driver, 3 the coupler and 4 the follower

grashofs condition consist on the following:

1. IF L + S < P + Q

and S is the frame, then the program should print that the mechanism presents a rotatory-rotatory movement

or L+S < P+Q and the FRAME is the opposite link of the shortest link, then the program should print that the mechanism presents oscilatory-oscilatory movement

or L+S<P+Q and S is the driver and the frame is adyacent to the driver, then the program should print that the mechanism presents two rotatory movement.

2. IF   L + S > P + Q

the program should print that the mechanism doesn't follow grashof condition and the movement is roker-rocker (doesnt matter what link is the driver and what link is the frame)

3. IF L+S=P+Q

the program should print that the mechanism doesn't follow grashof condition and the mechanism will have deadpoints.

I'm sorry, im a mechanical engineer student and I have very few experience programming (I only learned python like 2 years ago) and I'm having trouble with maple's language (which i know is very simple)

If someone could help me or guide me I would really appreciate it

Thanks alot 

PD. excuse my english

I am working on an iterative code where I need to save a matrix in an intermediate step. My code is long and it uses a separate data file. So, I am trying to state my problem taking a simple example.

At first, I define a column matrix A0. Using A0, I do some calculations and test some conditions. 
In the next step, I want  to do similar calculations and test some conditions but this time by changing the first element of A0. For the purpose of later use, I need to save the matrix A0 in its original form. I am trying to use the following method but both A0 and A1 (modified A0) turn out to be same.

> restart;
> n := 3;
> A0 := Matrix(n, 1, 1);
> #Do some calculation with A0
> A1 := A0;
> A1[1, 1] := A1[1, 1]+.1*A1[1, 1];
> A1;
> print(A0, A1);

This might be because I set A1:=A0 in the third line. But how do I save A0 in its original form?

hello evrey one , 

my question is how can i solve numerical equation using loop 

for each beta => deolve and export via excel
thank you

Download fo_wth_dsolve.mw

i want parametrix answer for z in terms of w, what should i do ? please help

Download solve.mw

In a Maple Primes reply by Joel Riel on Sept. 14, 2011 he included the following command referring to warnings issued from a dsolve, numeric command having events containing a halt action:

_Env_in_maplet := true:  # incantation to suppress integrator warnings

Where can if find explanatory help for his command and any others of a similar nature? 

I want to apologize if this being neither necessarily a minimal working example for one question nor just one question is uncomfortable. The "MWE" was created on and is designed for Linux machines including ImageMagick. The problem itself should be obvious to all users though, as the subfolder and creation of the gif are just conveniences. I have three sections concerning the different problems occuring in my attempts.

^{(which I was told is not doable in maple ... hence the gif)}

link

The goal was to create an animation that zooms in on a function. As maple just wouldn't allow scaling of axis in animations I decided to export single frames and then convert those with ImageMagick. Maple offers ssystem(„...“) which allows for command line usage.

The problem (may as well be a bug) occurs when I try to export images in a for loop with exportplot(...). If the path as well as previously exported images exist, it won't output an error but still not export the desired images. Exporting frames separately works just fine, as well as doing the very same operation in a separate for loop.

(see the first red comment and export section)

After using the workaround in a second for loop. I couldn't figure out how to import the images and then create an animation from them. The main obstacle is the fact that the imported pictures are put into plot-functions.

(see the second red comment)

Download bug_report_maybe.mw

I would be grateful for any suggestions. Moreover I have run accross

?DocumentTools:-Components:-VideoPlayer

which I could not figure out how to use by the help pages (I tried to create an avi and import that). If someone has informations on that, please share!