I am doing some lengthy computation using the externally developed (and published in academic journals) package 'Janet' to compute the compatibility conditions of an overdetermined set of linear PDEs.

At some point in the process (for a set of equations rather, but not SO, complicated) the procedure gives the error

in (PDEtools/NumerDenom) too many level of recursion

I have contacted the developer of the packages and he told me that he never directly calls PDEtools functions, so he deems that that call is made by some more standard maple command (such as simplify).

I could not find any documentation of NumerDenom function, to try and understand what might be the problem (my set of equations has some extremely 'bad' fractions, but I hope this is not that naive)

How does NumerDenom works, and where is it called by 'standard' maple command?

Thank you all.

Hello, Everyone!

I have a big TXT-file (~ 40 Mb). There are 970001 strings in this file. In each string there are 5 float numbers. I use command: readdata to obtain information from my file.

The problem consist in time, which Maple spends to read data.

My question is: how can I accelerate file reading?

My code: "Test read.mw"

My file in zip-archive: "Imp34462 14.zip"

Hello,

After solving ode I am looking only for the values >=1.5. For example at t=1, y(t)=3.8940.

How can I extract the values >= 1.5 from the solution to use it as data (t,y(t)) and save it ?

restart;
with(DEtools); with(plots);
eqn := diff(y(t), t) = -.25*y(t);

 init := y(0) = 5;

sol := dsolve({eqn, init}, {y(t)}, numeric, output = array([seq(i, i = 0 .. 50)]));
p[1] := plot(1.5, t = 0 .. 50, colour = black);

p[2] := odeplot(sol, [t, y(t)], t = 0 .. .50, colour = red);

display(p[1], p[2]);

Thanks

I have been trying to fit a function to experimental data. To do this i was using

.

The data is of the type

.

When I use initialvalues, I get a result, that fits the data well, but is clearly not the desired minimum. Maple delivers g always bigger than 10000 which is nowhere near -7, where it has to be for physical reasons. When using parameterranges I get the error

Warning, no iterations performed as initial point satisfies first-order conditions.

He stopps computing and simply prints out my initialvalues or the first value that is in the parameterrange with a huge RSS.

How can I use initialvalues and parameterranges together for my data?

I have been puzzled by a matlab toolbox problem for a long time. How can I get Maple notation in matlab output?

Both "Input display" and "Output display" in Tools-->Options-->Display was changed from "2-D Math notation" into "Maple notation". And the output in Maple is indeed Maple notation like this:

But the output in matlab is also 2-D notation like this:

when copy it to Matlab or Maple as input, it become the wrong issues like this:

How can I output Maple notation in matlab? The version is Maple 18 and Matlab 2014b, respectively.

My task is to develop a mathematical model of time-variant temperature
distribution in a bar with Maple. 
The bar is made of aluminum. The length is 202 mm and the diameter
is 8mm.
Heat is supplied from the kitchen lighter where the flame burns on butane.
The height of the flame is about 4 mm.
Your model should be able to answer how long the time it takes to reach
a certain value of temperature at the distance of 10 cm from the heat source.

anyone can help to answer this? im totally new to maple.. hopefully some1 can help me to answer this..

Hi EveryOne!

I have polynomial: p(x) = x^4 + 27x^3 + x^2 + 16x +1 over finite field F=GF(2^8)/f(x)=x^8 + x^4 +x^3 +1

The factors of this polynomial are: (x + 37)(x + 217)(x^2 + 213x +30) (in maple)

Hence there two roots of p(x): x = 37 and x = 217 in GF(2^8). The factor x^2 + 231x +30 is of degree 2. There are not roots in F. But in extension field GF((2^8)^2) of F, also there are two roots of factor x^2 + 213x + 30 (for example: x = 256 and x = 256^256 = 487).

How to find these roots of p(x) in extension field GF((2^8)^2) by maple? Please help me! Thanks a lot.

So I've been trying to plot a parametric equation with the command:

But I keep recieving the error: Error, (in plot) incorrect first argument [cos(2*t)+sin(2*t), -2*sin(2*t)+2*cos(2*t), t = 0 .. 6.29]

Do any of you have an idea of what I'm doing wrong?

I have written the code below, and received the error message in the bottom. Can any body help me?

> with(plots);

> u := 100*sin((1/2)*pi*x)*((1-cosh(pi))*sinh((1/2)*pi*y)+sinh(pi)*cosh((1/2)*pi*y))/sin(pi);

> implicitplot({u = 10, u = 20, u = 30, u = 40, u = 50, u = 60, u = 70, u = 80, u = 90}, x = 0 .. 2, y = 0 .. 2, grid = [100, 100]);

Error, (in plots/implicitplot) invalid input: the following extra unknowns were found in the input expression: {pi}
>

Hey

As a lot of people before me I'm severely dissappointed my Maple's ability to export a .mw file to .tex.

The output looks horrible and even disappears off the side of the page in some places.

I've searched far and wide on the internet but it's difficult for me to understand the few, outdated, results I've dug up.

Is it completely impossible to get my hands on a good (or just working) Maple 18 to LaTex exporter? It's not possible for me to begin coding my own.

So I paid for Maple 2015 and accidentaly mistyped my email address.  I was wondering if there is anyway that I can resend the same download to the correct email address.  If anyone can help this would be greatly appreciated.

Hi all,

The following command:

limit(CDF(cos(RandomVariable(Normal(0,1))),x),x=infinity);

returns erf(Pi/sqrt(2)) instead of 1, as expected for a CDF.

Does someone has an explanation for this strange behaviour?

Best regards,

Régis

Hello,

I'm trying to define a matrix that will have all the possible game results in a 9 team competition in one round. The results are a column in the form [game 1 home team, game 1 away team, game 2 home team, ... , game 9 away team]

This should give me a matrix with 18 rows, and 512 columns, where each column is a possible game result.

In essense, to continue the pattern of this matrix on for all 512 columns.

I've fiddled with for statements, but it ends up getting very messy given the number of nests that are required.

Thoughts? Any help would be much appreciated,

Thanks, Alex, Australia.

Hi Maple People,

I got stuck trying to write a procedue for my project today.  My topic is Prime Constellations.

If you want to help me, please read my primer on constellations

https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxwcmltZWNvbnN0ZWxsYXRpb25zfGd4OjNmOWZlNWQxZDY2ODY4YmQ

The procedure should refine an offset Vector and increase a multiplier scalar.

I want to delay putting the broken procedure until I can simplify it and try again.

Thanks,

Matt Anderson

hi friends

I encountered a problem and I can not draw the plot of this code

> sol := fsolve({diff(S, x) = 0, diff(S, y) = 0}, {x, y});

> with(VectorCalculus);
> with(linalg);
> s1 := evalf(subs(sol, linalg[grad](S, [x, y])));

> with(VectorCalculus);
> with(LinearAlgebra);
> s2 := evalf(subs(sol, linalg[hessian](S, [x, y]))); pmp0 := [x-subs(sol, x), y-subs(sol, y)]; sapprox := s0+evalm(`&*`(`&*`(transpose(pmp0), s2), pmp0));
> with(Statistics);
>
> with(stats); statevalf[icdf, chisquare[4]](.95);

> with(VectorCalculus);
> with(plottools);
> with(plots);
> with(linalg); ellips := {seq(stats*([statevalf[icdf, chisquare[4]]])(c) = sapprox, c = [.5, .95, .999])};
> plots(ellips(x, y), x = 950 .. 1000, y = 700 .. 750, grid = [50, 50], view = [950 .. 1000, 700 .. 750]);

can you helpe me?Thank you