In recent days, I have studied ExcelTools[Export]. Unfortunately, I still can not apply it.

oh, how??

Dear, can you provide an example?

Thanks!

I have to generate F(x) of a function with a degree of 5 who has zeros of x=2,x=1+3i,x=2-4i

After i put it into maple i use the command expand to give me the total function but afterwards i get this 144*i^4*x-25*i^2*x^3+x^5-288*i^4+118*i^2*x^2-8*x^4-188*i^2*x+25*x^3+104*i^2-38*x^2+28*x-8

i need to know what command can i use to get it to converts i^4 to 1 and i^2 to-1 that way i can truly simplify it. 

Dear everyone,

  I have a question about the memory requirement of generalized eigenvalue solver in Maple 10 and further versions.

Suppose I have a code like

***

with(LinearAlgebra):
Digits:=34;
n:=30;
A:=Matrix(n,n);
B:=Matrix(n,n);

for i from 1 to n do
  for j from 1 to n do
     if i=j then
       A[i,j]:=i*j;
       B[i,j]:=1;...

I want to create a simple executable bat fil.

1) When I click on it maple should launch in the background (I dont want to see maple open)
2) Then Maple should open a txt file located on the desktop (containing a 1), read the file
and save  a new txt file on the desktop containing the number in the previous fil +1.

How can this be done?

i study a simple differential equations as follow and get the solution,but i faced two warning which puzzle me:

> restart;
> eq2 := diff(x(t), t) = x(t), diff(y(t), t) = x(t)^2+y(t)^2-1;
   ans1 := dsolve({eq2, x(0) = 1, y(0) = -1}, numeric, [x(t), y(t)], range = -10 .. 10)       ;

Warning, cannot evaluate the solution further left of -1.1646698, probably a singularity

Hi everyone,

I have this differential equations:

gamma1:=1;gamma2:=1;

l:=t->sqrt((x1(t)-x2(t))**2+(y1(t)-y2(t))**2);
2 2
l := t -> sqrt((x1(t) - x2(t)) + (y1(t) - y2(t)) )

DE:=[diff(x1(t),t)=(-1/(2*Pi))*gamma2*(y1(t)-y2(t))/l(t),diff(y1(t),t)=(-1/(2*Pi))*gamma1*(x1(t)-x2(t))/l(t),diff(x2(t),t)=(-1/(2*Pi))*gamma2*(y2(t)-y1(t))/l(t),diff(y2(t),t)=(-1/(2*Pi))*gamma1*(x2(t)-x1(t))/l(t)]:

I want to draw the phase portraits (x1(t...

I'm using the BoxPlot function and am trying to change the colour of two dates in the title="string" part, so they correspond with the colours of the two related box plots. Is there a way to do this?

Hi,

I have tf=0.04s but the probe plot only 0.02s at one simulation, 0.03s for another simulation ! How to oblige the probe to plot from 0s to 0.04s ?

Thanks

I have two parametric equations, one for x(t), one for y(t).  Both are ODEs of order 1.  Both are implicit.  There is no way to solve explicitly for dx/dt or dy/dt.  How can I get Maple to do a plot of the solution?  I tried DEplot but apparently it demands an explicit presentation of dx/dt and dy/dt.   I have Maple12 on a Mac, but could use Maple15 on a server.

Dear everyone,

  Hi,

  I have a simple problem of writting data into a file:

  For something like

***********

for i from 1 to 3 do
  L[i]:=i;
end do;
writedata(`d:\test.txt`,L);

***********

I got
                       ...

Hello,

Just a small question: what's the difference between writing

product( (2*i-1) mod 3 + 1, i=1..10 )

which incorrectly gives 105411381075, and writing

mul( (2*i-1) mod 3 + 1, i=1..10 )

which correctly gives 432...

And what's the reasoning behind this?

-- Regards,

Franky

Hi everyone,

While I am getting more and more comfortable with the document mode, I have some questions regarding the document block feature:

- What is a document block good for anyway?
- Why not have the whole document in one block?
- Can one join two document blocks?
- when do I "remove the document block"
- How can I make sure that say an informational 2-D math expression inside a document block never gets executed?
-- Can I still...

I have a problem related to solving the complex equation of dispersion relation.

In the plots some modes are missed. I dont know whay?

Is possible to help me? (m0^2<0).

restart;
 with(plots):
 rrr:=proc()
 local ce,c0,ve,va,cte,ct,me,m0,DT,n,EQ,i;
 ce:=6.2;c0:=0.25;ve:=5.25;ck:=1.06;ct:=0.243; cte:=2.515;
 me:=sqrt(((ce^2-v^2)*(ve^2-v^2)/((ce^2+ve^2)*(cte^2-v^2))));
 m0:=sqrt((c0^2-v^2)*(1-v^2)/((c0^2+1)*(ct^2-v^2)));