Hi,

I am trying to plot in Maple 16 (just installed) and I am getting text output. Maple 15 worked just fine.

Anyone have ideas?

Regards.

> plot3d(x^2-y^2, x = -2 .. 2, y = -2 .. 2);
%;

                                  ...

Hi all, I am a teacher of middle/high school math. I have found that when I use the solve function on:

I get 5.674999999

In fact, as I was typing the above equation just now using Maple Math, I noticed it returns:

The Export function in ExcelTools completely overwrites Excel 2010 ".xlsx" files with no errors or messages.  The same command works properly for Excel 2003 ".xls" files.  It looks like a bug to me.

i have a procedure like this

> palindrome:=proc(n)

   option cache;

   uses ST = StringTools;

   if length(n) :: even or odd

   and modp(n,11) <> 0 then

   return false;

   else

   return ST :- IsPalindrome(convert(n,'string'));

   end if;

   end proc;

> palindrome("mom");

   error, (in palindrome...

Hi, 
I'm trying to visualize a 3-Dimensional function, the color being the 4th dimension. All the examples that I have found of the so called plot3d function only involve 2D functions, the third dimension really being the return value of the function. I need more: I have a 3D function which takes in (x,y,z) if you like, and outputs one number. I'd like to visualize this function in maple. 

Thanks, 
~Austen 

Hi,

See the code mli.mws

What is the mistake in this command ?

chfonc:=cat('piecewise(' , seq(cat(convert(t<lf[k],string) , ' , 1 , ' ,convert(t<lf[k],string), ' , 1 , ' ) , k=1..p) , '1) ') :

I am trying to solve three non-linear coupled initial value problems. The equations are a bit complicated. The MAPLE code is 

restart

with*plots

eq[1] := (1/6)*Ra*v(x)^3*((2*v(x)*w(x)^2*(v(x)^2/w(x)^2-3)*(diff(w(x), x))-6*w(x)^3*(1-v(x)/w(x))^2*(diff(v(x), x)))*A+v(x)^2*w(x)^2*(2*v(x)/w(x)-3)*(diff(w(x), x))-3*w(x)^4*(1-v(x)/w(x))^2*(diff(v(x), x)))/(w(x)^2*(w(x)+2*A)^2*(2*v(x)+3*B))+u(x)

eq[2] := (1/105)*(diff(u(x)^2*(v(x)^2+11*B*v(x)+39*B^2...

The following simple code

myproc1:=proc({parlist::list:=[]})
return parlist[1];
end proc:

myproc2:=proc(parlist::list)
return myproc1('parlist'=parlist);
end proc:

myproc2([1,2]);

fails with


Error, (in myproc1) invalid subscript selector

The reason is that myproc1 has the optional argument parlist, which has the same name as myproc2. myproc2 seems to make...

Hi all,

I want to compare two signals where intersections between the two signals represent the instant of command (like boolean pulse) of a thyristor. The two signals are volatges and command of thyristor is boolean. A conversion of voltage to boolean signal should also done, I think ?

Thanks in advance

See image below.

First of, thank you commenters, you have helped me so much in the past!

I am doing a matrix inversion with random numbers and I would like to loop the process, and have each inverstion go into a matrix, such that the matrix will be a bunch of rows ( i number of rows) and three columns (the matrix inversion yeieds three values)

> for i to 2 do;
> 
> a1h := Generate(float(range = 0.1316881e-2 .. 0.1359706e-2)); a1f := Generate(float(range = .317149811 .. .327463626...

I'm am new to maple and am not very familiar with it.

I have a state space represnetaiton (Xdot = AX+Bu  y+CX+Du)of a 3rd order non linear system.

X=[X1; X2; X3]

Xdot=[X1dot; X2dot; X3dot]

A=[0 -1 -1; 1 0.2 0; X3 0 -2.4]

B=[0; 0; 2]

C=[1 0 0]

D=0

With initial conditons:

X1(0)=X2(0)=x3(0)=An arbitrary concept of my choice.

I need to plot x1(t) Vs time.

I also need to plot the state trajectories...

Hi,

I am really stuck in one more bit thats the least square problem.  leastsquare1.mw 

Hope someone can help me to solve this bit and get me out of this problem :(.

Least square method is successfuly implemented in MATLAB code (WRITTEN IN THIS MESSAGE AT THE END), but I couldn't do it in Maple.  I am having problem in the for loop section,  I am attaching Matlab code and  maple code ...

I have a differential that I'm solving using rk4 on maple and I want to plot the resaulting points in an interval. How do I do that?

here is what I've already done:

> f := {y(0) = 0, diff(y(x), x) = cos(5*y(x))-x};

> p := dsolve(f, y(x), numeric, method = classical[rk4], stepsize = .1);
proc(x_classical)  ...  end;

> for i from 0 by .1 to 3 do p(i) end do;
           ...

scatter2d  quantile2 scatter1d is removed?

with(stats): with(statplots): with(transform):
with(random): with(describe): with(plots):
datax:=[normald[5,1](100)]:
datay:=[normald[7,3](100)]:
scatter2d(datax,datay);
quantile2(datax,datay);
scatter1d(datax);
scatter1d[jittered](datax);

who(things) replace it?

i have a systems of differential equation:

J[n]=2*A[n]

S[n+1]=J[n]

A[n+1]=S[n] + 0.5*A[n]

with initial condition A[0]=10, J[0]=30, S[0]=5

i have a had time writing a procedure for this systems. help please

do i need a for command for this procedure