Hi All,

I am trying to solve set of equations after applying boundary conditions.  There are 4 coefficients which I have to find by solving following 4 equations;

I tried to solve using the command solve({A, B,C,D},[E,F,G,H]), but it just returns [],  does anyone know which command to use for backward substitution of coefficients.  Also if I try to solve it separately, it says "recursive error"

Your help will be appreciated

Thanks

How to get n th term of an equation and total number of terms in equation?

for example if f := 2*x+3*y+2

any function can extract term from equation such as second term is 3*y

total number of terms is 3

I opened one of my worksheets this morning and started executing it using the ! tool. When it came to the first plot command, it replaced the previous plotted output by the following:

1 ************                                                                
  +          **********                                                       
  +                   ******                                                  
  +                         *****A...

I tried to solve the system of odinary differential equations. But system was not able to solve it. As a result i've obtained a error message displayed on the last line of my program. Give me advise please how to overcome this problem.

restart; unprotect(gamma); 
gamma := 1.322; 
m0 := 0.759e-22*0.1e-2; 
d[1] := 0.1e-2; d[2] := 0.2e-1; 
A[1] := (1/4)*Pi*d[1]^2; A[2] := (1/4)*Pi*d[2]^2; 
k[B] := 0.138e-22; 
T[res] := 300; 
kp := 0.1e6*(1/760); 

Hello everybody

I need to simplify (or even approximate ) a huge expression which is a two-variable function of x and t,

including  SinCos and Exp. ( it's length is like 10 pages ! )

I tried everything but nothing worked.

Please HELP !

it starts like this:

Q(x,t):=

Hello, 

I am just starting to learn about maple.

I have a graph of two functions and would like to find the range that they agree within

 a certain percentage using fsolve() and format the interval as a list. 

The part that is throwing me off is the within a certain value part.  Thanks in advance!

testerror := proc(b)
if b > 3 then
    return;
end if;
b = b+1;
proc(b);
return;
end proc;

where is wrong?

illegal use of a formal parameter

evolf := proc(z, f, terminal_counter)
h1 := z + f;
h2 := z - f;
h3 := z*f;
h4 := z+diff(f,x);
h5 := z-diff(f,x);
h6 := z*diff(f,x);
h7 := subs(x=z, f);
N := 7;
test := [h1, h2, h3, h4, h5, h6, h7];
print(test);
fitness := [0, 0, 0, 0, 0, 0, 0];

if terminal_counter > 5 then
    return fitness;
end if;

total_fitness := 0;
for i from 1 to N do

How to find the index of a number in an array?

if a := [11 12 13 14 15];

which function output  number 12's index is 2

when write

indexarray := proc(f, target)

N = 7;

for i from 1 to N do

    if f[i] = target then

           return i;

    end if

od;

end proc;

error final...

I've been using LagrangeMultipliers to solve a problem. Solutions returned involve RootOf.

What I want to do is extract the expression within RootOf() so that I can do fsolve() on that.

The expr from RootOf is a 6th order polynomial in _Z.

I've tried convert(RootOf(...), radical), but it doesn't work very well on polyhnomials of order greater than or equal 5.

Any suggestion(s) for this extraction that I want ?

A := C/H/k*Q/R1/R2/(-1+R1)*(Q*R2*R1-R1*R2+1)-2*C*Q*(R1*R2+1)/H/k/(-1+R1)/R1/R2;

plot14:= plot(subs({Q=6,R2=8.75,k=4,C=1.96,H=7},A),R1=0..1,color=blue):

display(plot14,view=-15..10);

points:=op([1,1],plot14):

writedata("c:/khan/plotdata.txt",points,float);

Error, (in writedata) Bad data found undefined

Any one there?

Is there a reverse of:

Hi all,

I've just downloaded and installed the Maple 13.02 update, and when I go into the Maple Portal, I am finding that it sometimes locks up when I click on a hyperlink. When I say "locks up", I mean it simply stops responding.

It is 64-bit Maple running in a 64-bit Win 7 environment.

The only thing that I can think of is that the issue is related to Java somehow (which is what Maple is based on, correct ?)

thanks,
Andrew J Fortune,

I'm working on a 3D program that plots stars, star clusters and other objects of interest against a model of the Milky Way. The guts of this program create a few hundred points (< 2000) that represent stars, and move them a little bit in random directions to create a cloud effect. Then the animate procedure rotates them about the center of the galaxy. I would like to add more stars and do more things with them, but I am encountering a very sluggish editor, suggesting that Maple is imposing a memory limit. The Activity Monitor says that Maple is using 140 MB, so gigabytes of RAM remain available. Furthermore, if I save the plot as an animated gif, I can run half a dozen copies simultaneously in separate browser windows without encountering noticeable slowdown. But I can't elaborate the program without better performance from the editor.

The program is written in the Document interface. I tried saving it to the classic interface, but that didn't seem to help, and I found it difficult to edit.

Ideas sought.

The problem has been discussed in mapleprimes before, but I have not come across a neat solution. Perhaps there is one. What is the state of the art for exporting 3D graphics (plot3d, etc.) with Maple 15?

What I think I know is this: standard GUI has a completely new way of treating 2D graphics but has an outdated way of rendering 3D, while the classic GUI, though no longer developed, for some reason typically renders better 3D graphics.

I used to export graphics...