please a need help

i try to organize the matrix by indice , i.e 

B := Vector[row]([1, 4, 13]);
 ind:=indices(B);

A := Matrix(3, 3, [1, 3, 4, 2, 4, 1, 2, 3, 2]);
#i try to do that

A:=B(ind,..); # and didn´t work  

#this is what i wont,

A := [1, 1], [1, 2], [1, 3], [3, 1], [3, 2], [3, 3], [2, 1], [2, 2], [2, 3]

help

What are all the maths that are on this program?

Hello All ,

I have attached my workseet for reference.

I find it strange that the solutions calculated in optimization shows a value "X" but when i try a value greater than "X" , there is still a solution available which is very irregular.Since the optimization finds the value beyond which the solution for a6 is zero/negative.

I am not sure what is causing this problem or is it just the problem with the optimization.

Hi all!

I have declared two vector valued functions

G1:=(x,y,u)->(x/(1-a*y) , y/(1-a*y) , u/(1-a*y));

G2:=(x,y,u)->(x/(1-b*x) , y/(1-b*x) , u/(1-b*x));

And composed them, so far so good

G1G2 := G1@G2;

But now I would like to simplify G1G2, how can I do this? With simplify(G1G2) I get an error.

Any idea how I can fix this?

Thanks in advance,

Arta

Hi everyone, Im trying to solve a catenary problem. x is defined in terms of y1, y2, and a. But in my case a is the only unknown. I try to express a in terms of x, y1 and y2 by the following script:

> x := a*arccosh((y1+a)/a)+a*arccosh((y2+a)/a);

                      /y1 + a\                 /y2 + a\
       a arccosh|----------| + a arccosh|--------|
                      \  a   /                    \  a   /

> solve(x, a);

      ...

Using Maple for Functions of a Random Variable

How to make a query is made to F (t) at each iteration of the dsolve command?...

restart;
de:=m*diff(x(t),t$2)+b(t)*diff(x(t),t)+k*x(t)=F(t);                 
a random force :
nd := Statistics:-Sample(Uniform(-100, 100)):
F:=proc(t) ;   
if not type(evalf(t),'numeric') then      

Hello,

  Excuse me, I have a code

****

for i from 1 to 5 do
  f[i]:=i*2;
print(i,f[i]);
end do:

****

  In windows, the output is

**

                              1, 2
    ...

I am a programmer (not a real mathematician, scientist or engineer) who wishes to insert just dx into an expression and have Maple recognise this as an infinitesimal difference in x rather than just a symbol named dx with no relation to x.

Is this possible in Maple?

I ask as I want to include dx as a normalising term in a derivation and hope that it will 'drop out' at a later stage.

Regards,

Will Furnass

Hi,

I want to solve this differential inequation in maple please help me.

diff(N(t),t)-mu*N(t)<=Pi;

How do i find coordinates of the vertices of a square in Maple which coordinates of the vertices are integer numbers? Please help me. Thank you.

I want to animate the display of a polygon. It's the platform of a stewart gough rig. Have 200 poses stored as Platform_i i i=2..200. the Base is static( obiviously). Haven't been able to figure out how to get    animate(display .....) to work. The work sheet just contains copy/pasted commands. The time period for the animated display is about 10 seconds but real time is not that important. How do I get this to work?

Hi, I have variables and would like to assign different values to them and later on combine them for the final calculation. How do i do it? For example:

I have 5 variables in each file. (a,b,c,d,e).

It contributes to my Force, Amplitude, MatrixAA and MatrixBB

How do i put it in a way where i can have 3cases?

Case1:= a=1,b=2,c=3,d=1.5,e=6 ; And It shall give me Force1, Amplitude1, MatrixAA1, MatrixBB1
Case2:= a=3,b=3,c=1,d=3,e=8 ; And It shall...

Suppose I have a matrix M, with rational entries. I need to go row by row and scale each individually by the smallest possible integer such that the entries in each row are integer-valued - anyone have an easy way to do this? It's a large matrix.

i do have two equations containg two pararmeters, i need to exclude one parameter, then substitute it in the second equation and then differentiating the first equation which contains now one parameter, then solve it for that parameter.

i actually did it, but fsolve function does not work with me , can you help me please

Hi, whenever i save the worksheet, all my previous calculated solutions are missing and I need to execute it all over again. Is there a way to keep the previously run data because it is a long worksheet and takes quite sometime to run it. Please advice. Thanks.