454 Reputation

19 years, 108 days

Parameter exports of Grid[Launch] comman...

Maple

If you look at Maple help on Grid[Launch] command there is an example of checking the prime numbers.

I do not understand why the timingData variable is empty after specifying it in exports parameter.

When I do not specify it in the exports parameter, the timingData variable has the same value as it had before calling Launch command.

3D PDE (numeric) solver....

Maple

I have been investigating Predator-Prey spatial models, e.g.

Solving DE with a piecewise function....

Maple

Hi everyone,

I have a differential equation

diff(N(t), t) = r*N(t)*(1-N(t)/K) - p(N(t)),    N(0) = N0

where

p(x):=piecewise(0, x<0, S/(N_crit)*x, 0<= x<N_crit, S)

This equation represents the population growth model where the predator is present.

Plot - labels....

Maple

Hello,

can you tell me, please, how I can create labels when plot command (and its labels option) doesn't work?

Try these examples:

Ex1:  plot(1/(3+exp(x)), x = 0 .. 10, labels = ["x", "y"]);

Ex2:  plot(1/(3+exp(-x)), x = 0 .. 10, labels = ["x", "y"]);

In first case everything is OK, in second "y" label doesn't appear and I can't manage to put it into plot.

Thank you.

PS: I'm using Maple 13.

Eigenvalues precision....

Hello.

Does anybody know how precise the eigenvalues (or the eigenvectors) of some Matrix are (when I use Eigenvalues(Matrix))?

Let's assume Digits=15. Can I have any certainty that the computed eigenvalues are precise to some (15??) digits?

I don't know how Maple computes them but if I suppose several (many) arithmetic operations then the error can move "upward".

Am I wrong? Thank you for all your suggestions.

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