Hi,

> assume(y::prime)

> about(y);
Originally y, renamed y~:
  is assumed to be: prime

I don't understand this answer:

> is(>0)

      FAIL

Just to clarify, so if an issue is brought up here in mapleprimes there is a possibility that it will go un-noticed by maplesoft?

I realize some issues brought up by people are sometimes solved within, but there is an occassional request for input from maplesoft on these forums that go un-answered.  Just recently a question only maplesoft could answer here and there has been no reply http://www.mapleprimes.com/posts/123111-Maple-1501

I am going to guess...

I want to solve a set of ODE equations numerically,there is 5 equations with certain boundary conditions,please help me,what kind of dsolve order could i use? when i use dsolve({sys,bcs}type=numeric) i get an error that say me:system must be entered as a set of equations! how can i solve it?

Hello everyone

I'm trying to do a fit for some points using a model function. However, I don't want to use the full range of the independent variable in the model function because I know there will be no fit then. How to assign a range for the fitting variable?

In the case my writing is not clear, here is what I mean:

xdata:=points

ydata:=points

modelfunction:=f(x,parameters)

Fit(f(x,parameters),xdata,ydata,x,rangeofx=r);
I...

Interesting behavior!!

> restart
> N := 150; L := LinearAlgebra[RandomVector](N);

                              150

> st := time(); for j to 10^4 do ArrayTools[SearchArray](`~`[`=`](L, max(L))) end do; time()-st;

             ...

Hi, i wrote my script file some time ago, and found that I wrote `:=` in one of the equations. when I remove the ``, just let it be :=, it does not work and is spending a long time to evaluate. May I know what does `:=` means please?

Thanks.

Hi everyone, 

In my research project, I needed to evaluate a multi-variable integration. I'm trying to do this in Maple, and seems no matter I use Int or int, it failed to evaluate the integration. 

Here's my code:

I'm integrating a joint probability density function which is basically a multiplication of four PDFs of four Gaussian distributions:

> mu := 0:                                                    ...

I have problems with the time delay the procedure for computing the Hough transform of the image that Annex. Delay 5534.875 seconds. How to improve, optimize the procedure, to be more efficient at runtime?

Hough.mw 

Hi,

I have a system consisting of a multi-body system and various modelica/maple custom components. The problem is whenever I re-run the simulation even though all the simulation settings are same, the simulation results are inconsistent. There should be no difference between each simulation as all the parameters/settings are same. I am attaching two pictures which are both obtained from two successive simulations

Hello everybody! I have a question that how to show the number of roots of Eqs automatically. Followings are part of my program: 

>U:=solve({-2/phi^3*u[0]^2*diff(phi,x)-4/phi^3*w[0]*diff(phi,x)-2*u[0]/phi^3*diff(phi,x)^2, -6/phi^4*u[0]*diff(phi,x)*v[0]+12*v[0]/phi^4*diff(phi,x)^2, -2/phi^3*v[0]*diff(phi,x)+2/phi^3*w[0]*diff(phi,y)},{u[0],v[0],w[0]});

I can obtain three items roots. My question is how can I obtain the number of roots automatically by using the program!

Hello!

I have a strange issue:   I have a procedure with signum, square roots, I and float numbers. First I optimize it and then compile.  (or just run compile with option optimize=true).  As a result I get a error:

Error, (in TargetLanguageTools:-GetExprType) Analysis is not a command in the _EnvCGEngine package

Trying to understand, what is happening, I manually copy-paste the optimised procedure to the argument of compile. Then it works!!!

I have a compiled function and want to integrate it numerically.  The integration procedure first tries to evaluate the integrand with symbolic values and return a error, since the compiled function accepts only real values.  So I have to write a STUPID workaround  for manual typechecking:

integrand2 := proc (kF1, kF2, m, k, omega, q) if type(kF1, numeric) and type(q, numeric) and type(kF2, numeric) and type(omega, numeric) and type(m, numeric) and type(k, numeric...

Hello,

How can I use assign(...) inside in proc in order to affect the local variables and not the globals.

Thanks

Consider the following:

with(Physics);

Setup(noncommutativeprefix = z);

(z1*z2)*z1;

gives z1 z2 z1 as it should but

z1*z2*z1*z1;

gives z1^3 z2. Thus noncommutativity has not been respected?

What can I do?

I have an indefinite sum, for instance:

> E := Sum(f@g@@k, k=0..n);

If I use D(E), I just get: D(Sum(f@g@@k),k = 0 .. n)

> D(f@g@@k) gives the expected result: D(f)@g@@k * D(g@@k)

Doing this works:

> F := Sum(D(op(E)[1]), op(E)[2]);

   F := Sum(D(f)@g@@k * D(g@@k), k=0..n)

However I want to apply it to complex expressions containing Sums and Products. And I can't check if E is of type indefinite sum. The hasfun(E, Sum...