question1:

DEtools[phaseportrait]

([diff(y(x),x)=-y(x)],y(x),x=-2.2,[[y(-2)=2],[y(-2)=1],[y(-2)=-2]],dirgrid=[17,17],arrows=LINE,axes=NORMAL);

This is the version in Maple 7?

After accessing to the help file,maybe it should be

with(DEtools):

phaseportrait(diff(y(x),x)=-y(x),y(x),x=-2.2,[[y(-2)=2],[y(-2)=1,[y(-2)=-2]],dirgrid=[17,17],arrows=LINE,axes=NORMAL);

but can't generate the resuls.

dirgrid seems not exist in the help.

question2:

http://en.wikipedia.org/wiki/Simplex

for what value(s) of m the function is increasing (Xderivative > 0)/decreasing (Xderivative < 0):

m * log(x) / 2^m + (1-x^m) / (1+x)^m

Hi,

I got some Matrix problems to ask:

First,

A:=Matrix(3,4,[[1,2,3],[4,5,6]]);

it will fill with '0's

A:=Matrix(3,4,[[1,2,3],[4,5,6]],fill=8);

it will fill with '8's

B:=Matrix(3,4,[1,2,3,4,5,6]);

it will fill with '0's

B:=Matrix(3,4,[1,2,3,4,5,6],fill=8);

it does not fill

what's the proper way to do it?

Second,

A:=Matrix(3,4,[1,2,3,4,5,6]);

convert(A,listlist);

[[1, 2, 3, 4], [5, 6, 0, 0], [0, 0, 0, 0]]

what if I want to have ONE single list as

I have Maple 12, and not MapleSim.  Has anyone stumbled across something that "runs on top" of Maple that is similar to COMSOL Multiphysics that runs on top of MATLab?  I'd like to figure out (without writing the Maple code myself...) how to import some simple 3D geometries and run some (possibly symbolic, probably numeric) simulations of electromagnetic and heat flow phenomena.  COMSOL uses FEM.  Is this something MapleSim could do?  I don't need anything that'll do "real world" geometries (i.e.

BIFURCATION DIAGRAM PROCEDURE
restart:
with(plots):
*xexpr is the logistic function to be iterated (we always start off at x=1/2, which will eventually attract).
*[ra,rb] is the range of the parameter.
*acc is the number of points sampled in [ra,rb]
Bifurcation := proc(initialpoint,xexpr,ra,rb,acc)
   local p1,hr,A,L1,i,j,phi:
   global r,L2:
   hr := unapply(xexpr,x);
   A := Vector(600):
   L1 := Vector(acc*500):

Hi,

I am trying to generate a non-singular Matrix.

> KeyMatrix:=Mod(127,RandomMatrix(n),integer);
> if Determinant(127,KeyMatrix)=0 then
> Return(KeyMatrix);
> fi;

Basically, it asks Maple to return to
KeyMatrix:=Mod(127,RandomMatrix(n),integer);
again if the current one if not invertible.

however, i have confused myself with RETURN and return

which is should i use?

thanks

casper
 

What is the pattern in the following polynom: (how to generate them) 

1:     12 n^2 + 12 n + 1

2:    300 n^3 + 450 n^2 + 160 n + 5

3:   840 n^4+1680 n^3+1030 n^2+190 n+3

4:  1260 n^5+3150 n^4+2730 n^3+945 n^2+107 n+1

5:  27720 n^6+83160 n^5+93030 n^4+47460 n^3+10689 n^2+819 n+5