%piecewise(``, x+y-2*z = 1, ``, 2*x+y-3*z = 5, ``, -x+y+z = 1); What does % here do?

I can find no help page to explain the functionality of the percent sign in this command and removing it produces an error. Please explain this.

Hi

How  can we draw diagrams in tripartite coordinate system?

Hello,

How to Factorize the coefficients of this matrix :

> A:=Matrix([[x^3+x-2,x^2+x],[x,x+1]]);

factor(A) does not work !

Thank you,

Gérard.

Hello,

I have the following list made with dsolve:

num_n := dsolve({c_i1, c_i2, Ecuacion_1, Ecuacion_2}, numeric, method = classical[rk4], {u(x), v(x)}, stepsize = .1);
proc(x_classical) ... end;
for i by .1 to 2 do num_n(i) end do;
[x = 1., u(x) = 1., diff(u(x), x) = 0., v(x) = 0., diff(v(x), x) = 1.]

...

But when i do :

u(1);

u(1)

Should be u(1)=1 and not u(1)=u(1).

Regards.

Carmelo.

I would like to ask your assistance in understanding the following Maple interaction which speaks for itself.

> sum(product(k+4-m, m=0..k-1)*z^k ,k=0..j);                                         
                    /    j                 \                                         
                    | --------'            |
                    |'  |  |               |  (j + 1)
                    |   |  |    (j + 5 - m)| z
                    |   |  |               |
                    |   |  |               |
                    \  m = 0               /               1
                    --------------------------------- - -------
                                 4 z - 1                4 z - 1

> series(simplify(subs(j=6, %)), z=0, 16);   
              2       3        4         5         6            7            8
1 + 4 z + 16 z  + 64 z  + 256 z  + 1024 z  + 4096 z  - 1646816 z  - 6587264 z  -

              9              10              11               12               13
    26349056 z  - 105396224 z   - 421584896 z   - 1686339584 z   - 6745358336 z

                    14                 15      16
     - 26981433344 z   - 107925733376 z   + O(z  )

> sum(product(k+4-m, m=0..k-1)*z^k ,k=0..6);
                     6          5         4        3       2
             151200 z  + 15120 z  + 1680 z  + 210 z  + 30 z  + 5 z + 1

> sum((k+4)!/4!*z^k ,k=0..6);
                     6          5         4        3       2
             151200 z  + 15120 z  + 1680 z  + 210 z  + 30 z  + 5 z + 1

This was with Maple 18 (X86 64 LINUX).

Best regards, Marko Riedel

H := 1/(2*m)*diff(f(q,P,t), q)^2 = -diff(f(q,P,t),t);
assume f = f1(q) + f2(t);
H := 1/(2*m)*diff(f1(q), q)^2 = -diff(f2(t),t);
dsolve(H);

set each side of equation be a constant E which is anticipated integration constant
how to solve to S = q*sqrt(2*m*E) - E*t

and

p = diff(S,q) = sqrt(2*m*E);
Q = diff(S,E) = q*m/sqrt(2*m*E) - t;

There is a desire to explore the process of filtration combustion. To do this, you must solve a system of differential equations in partial derivatives.
I write down all the equations.
Boundary conditions in Maple 2015.0 interpreted incorrectly.
I need to write like that:

given that:

It turns out so:

ie somewhere lost derivatives

,....

As in Maple record boundary conditions correct?

Thanking you in advance.

can maple 18 install in mobile phone Lumia 950?

Hello everyone. 

I can not calculate it here

Probably, the problem with the calculation of surface integrals. I would be grateful for any help.

Download 1.mw

Hi, 

The question: 

Create a table of the droplet´s range as a funstion of the initial velcity for v0=0.2..4 m/s in steps of 0.2 m/s, each with starting angle of 36 degree. What range of Reynolds numbers does this correspond to? Plot the result.   

I get the result for one of the v values, but struggling to get values for all the v-values. 

F_D:=proc(v::list) #force/mass
local k,vx,vy;
vx:=v[1];
vy:=v[2];
k:=-evalf(3*Pi*mu*d/m);        #common constant, calculated only one time
[k*vx,k*vy];                           #returns a vektor
end proc;

 
Euler:=proc(vo::list,h)             #using the Euler method to solve the equations
local vx,vy, F;
F:=F_D(vo);
vx:=vo[1]+h*F[1];
vy:=vo[2]+h*(F[2]-g);
[vx,vy];
end proc;

Hi all,

I want to know how we can have the result which is made in Maple in Latex in a good style... I must prepare a report of it today, but when I copy the result from Maple to Latex, there're a lot of things to edit, also the results that are obtained from Maple are a lot, so it's very difficult for me to type it in Latex...

Please help me

I have the solution to a heat PDE, v and the error esitmate u + cos(x+t) = v

I want to plot log v(1,t) as function of log u(1,t) in maple, but I seem to get an error:

Error, (in plot) unexpected option: ln(u(1, t))

I am attaching my code below.

How to fix this problem?

Thanks in advance.

PDE+cos.mw

Hello to all

I am Jorge Gracia an exchange student working on my Thesis.

I started working with maple recently, and I am having some problems to achieve the results that I am looking for.

My work consist in the next Steps.

Using maple and taking some fatigue tests data, create a wav file with the some of the following formats:

Supported data formats are wave type 1 (PCM integer Data 8 Bit unsigned, 16 Bit signed or 32 Bit

signed) and wave type 3 (PCM float data (32 Bit IEEE float).

In the same way, if I already have a wav file, read the values of every point of the wave in order to understand and study the results.

If I have a normal plot, convert it into a wav file plot with the formats from above

With all the results, I will be able to work with this wav files in a fatigue test machine achieving more realistic results than with the standard waves.

All the information about this will be welcome.

Thank you for all.

Hello,

Thanks to the function Exports, it is possible to see the differents functions and modules which are in a module.

For example, I find in the module GetMultibody a module called GetLGM which permits to conduct some linear graph analysis. I'm interested by this module.

However, to my knowledge, I didn't see any help on this module.

How can I do so as to understand the inputs to give to the functions of this module in order to use the functions of this module ? In other words, how it is possible to use functions from a module when you don't have any help at your disposal ? 

Thanks a lot for your help.

Dear all;

I need you help for solving this problem, and thanks in advantage for your help.

I have a polynom like  P =x^6-4*x^3+x-2;  and i would like to find an approximate value of the roots in some interval [a,b] =[-2,2] using sturm sequence.

The method is based on:

1) first construct the sturm sequence:

For given polynom P =x^6-4*x^3+x-2;

Let S0=P;

S1=diff(p,x);

let   s:=quo(S0,S1,x);
       S2:=-rem(S0,S1,x);

.... S[k+1-rem(S[k-1],S[k]);

S[k] is the sturm sequence.

2) let f(a)= number of change of sign in the sturm sequence and f(b) the same . so f(b)-f(a) give the number of roots in the interval [a,b].

3) If f(b)-f(a) =0 so there are no roots

and if f(a)-f(b)=1 one can find the root

4) if f(a) -f(b) >2  :

given toterance tol=0.001; for example

if the abs(a-b)<2*epsilon we display a message that there are k roots at (b+a)/2

with our error tolerance

5) otherwise if c=(b+a)/2 is not a root of P_k(x)  for any k, ( where p_k is an element of the sturm sequence ) 

we divide the interval into equal halves [a,c] and [x,b] and we run step 2 on each interval

else if c is a root of one of these p_k(x) add any time account to c so that c lies close the middle of [a,b] and not a root

6) Give all the roots ( approximate the rrots with small error epsilon).

I kindly  appreciate your help