dy/dx=(y²-1)/(x²-1),  y(2)=2

Hi there,

            Basically i performed some calculations on maple and obtained a set A with about 8000 integer outcomes.

Im trying to create a loop that counts how many times there is an outcome of the integer 70 out of the 8000.

So far I have created the following:

A:=[10,20,..........]

s:=0

if A=70 then do s=s+1 end;

But this is not working

Any help will be appreciated

countries.zip

I thought I'd create a partial map of the middle east using a procedure with Maple.  Let me say it's not the quickest thing to do when the data format is not particularly favourable. 

I downloaded data from Coastline Extractor from ngdc.noaa.gov/mgg/coast.  This gives you point data sets.  You can then use maple to pointplot...

Hi. I am very new to Maple and there is something I can't find an answer on.

I would like to perform symbolic manipulation to help me simplify some equations. I was trying to define E to be a generic function operator, (expectation in statistics)

I have a equation y = a + b + c*d + e*f +..... something really long

I am to say R(y) = E(p*y)

How do I go about teaching Maple that my function is commutative and there are sets of rules which can be used? e.g.:

how is possible to draw each line separately?

n1 := 1; n2 := 1.45; n3 := 3.5;

z0 := 120*Pi; d1 := 1; d2 := 1; d3 := 1;a := 1;

k0 := 2*Pi/lambda;

ub := sqrt(n1^2-`βb`^2); vb := sqrt(n2^2-`βb`^2); wb := sqrt(n3^2-`βb`^2);

Ub := k0*ub*d1; Vb := k0*vb*d2; Wb := k0*wb*d3;

z1 := z0/ub; z1b := z1/z0;

a0 := -tan(Vb)/(wb*ub)-tan(Ub)/(vb*wb)-tan(Wb)/(vb*ub)+tan(Ub)*tan(Vb)*tan(Wb)/wb^2;

b0 := tan(Ub...

Dear all,

how to convert a maple graphic  created from a symbolic expression to spreadsheet?
Por example, after the command:

plot(2*x+1, x=0..4);

I vould like to get the data points calculated by Maple to generate this graph. If possible, inside a spreadsheet in order to redraw these data with Excell to get a better figure aspect...

Thank you.

AHOY! when I compute the cube root of -8 using maple  14.  It gives me the output -8^(1/3)

my input was........

f:=x->

f(-8)

I would like maple to give me the answer of -2 How do I change that? Note I need to define the cube root as a function.

Thanks

Dear all, I try to use threads in Maple 13 with Thread:-Create() and Thread:-Wait(). The worksheet works if I use no or just a single thread. One of the subroutines contains an fsolve command to find the zeros of some Function which involves special functions (LambertW). When I create two threads I get error messages such as `fsolve/StorePoint`, "invalid point dimension" and `fsolve/StorePoint`, "numeric exception: division by zero". Is the fsolve function not thread save? I tested, using stopwhen(...

Hello,

Sorry if the question is too naïve: I'm new to Maple.

I want to find the solutions, both in the real line and in the complex plane, of the following transcendental equation:

x+s*exp(x * sigma)-mu-s=0

mu is positive (say mu=6) and I am interested in the case in which s is both positive and negative (say, s=1 and s=-1).
By plotting s*exp(x * sigma) vs. mu+s-x (x real), and also using fsolve, I can see that there are two solutions when s=1 ...

Hi maplers

I am using maple 14 on windows 7 and every time maple have to evaluate anything a progressbar pops up. It frezes at about 60%. I have read other post that suggest to turn off my firewall, but without any luck.

Then i tried to manually upgrade to the newest verion(14.01). I then get a "Invalid Purchase Code" msg. with the argument: "system clock has been set back". i then re-activate and maple pulls the same stunt after a restart(it askes for a restart after activasion).

 of the equation x-(floor(sqrt(x)))^2-2011 = 0  with Maple? This is a problem from Lviv School Mathematical Olimpiad of the current year.

i follow

http://www.maplesoft.com/applications/view.aspx?SID=4706

and edit existing code to solve a equation and got some questions and error, How to solve pde with finite difference in maple?

r := 0.03;
K := 20;
Smax := 20;
T := 1;
ex1 := diff(y(x,t), t) + r*x*diff(y(x,t), x) + 1/2*sigma^2*x^2*diff(y(x,t), x$2) + x*diff(y(x,t), x)*diff(y(x,t), t) = r*y(x,t);

bc1 := y(0,0)=K*exp(-r), y(Smax,0)=0;
a := 0;
b := 1;
N := 10;

Does anyone know how to control the placement of the directional arrows for a digraph?

Here's an example:

with(GraphTheory):

G := Digraph(Trail(4,2,1,3,4,5),Trail(6,8,9,7,6,5));

SetVertexPositions(G,[[0,1],[1,1],[0,0],[1,0],[2,0],[3,0],[4,0],[3,1],[4,1]]);

DrawGraph(G);

produces:

The...

 Hello,

I am trying to use a worksheet developed by Professor Batista [ritz06.mws] for calculating plate vibration frequencies using the Ritz method, which is available from the Applications directory - Mechanical Engineering folder.  The worksheet was developed using Maple 12 and I am using Maple 11; a careful reading of the file didn't show any commands that were incompatible across the two versions and yet I am not able to solve the worksheet using the default inputs provided in the worksheet.  I have attached a PDF output of the file with the error message.  Any assistance that could be offered would be greatly appreciated.

Please send your response to wayne.bell@fpl.com.

Kind regards,

Symbolic_integral.mw

Thanks in advance