MaplePrimes - Newest Questions

How to restart Maple AI

C_R — Mon, 01 Jun 2026 15:48:01 Z

I asked Maple AI what a glyph is. Then I prompted this

A kernel lost message was returned and the AI pannel became irresponsive.

Maple is still running well in exsisting and new tabs.

Can the AI service be restarted from the user interface?

(Is that crash reproducible?)

Lattice Points and Lattice Polygon

Alfred_F — Mon, 01 Jun 2026 07:46:51 Z

For exercises involving Pick's Theorem, I need grid points within a Cartesian coordinate system. How can "all" grid points - at least within the first quadrant - be generated without the tedious manual entry of integer coordinates? Is it possible to draw grid polygons as closed polylines simply by clicking on the grid points? (BTW: At the moment, this works well in the good old "Cabri.")
My search within the "Help" section (using terms such as plot, grid, mesh, lattice, etc.) proved unsuccessful.

HTML entities in 2D Input mode

C_R — Sun, 31 May 2026 10:48:32 Z

The HTML characters in the attached document cause problems here on MaplePrimes. You have to open the worksheet

Download HTML_characters_in_math_mode.mw

Maple 9.5 example, in later version

Ali Guzel — Sat, 30 May 2026 16:52:17 Z

05-2-2.mws

Can you help me with this code?

>	restart: with(VectorCalculus):

>	assume(g>0,Omega>0,V0>0,theta>0,alpha>0,alpha<=Pi/2):

>	alias(omega=w,Omega=W,alpha=a):

>	w:=<-Wcos(a),0,Wsin(a)>;

(1)

>	r:=<x(t),y(t),z(t)>; v:=diff(r,t);

(2)

>	F[gravity]:=<0,0,-g>;

(3)

>	F[Coriolis]:=-2*w &x v;

(4)

>	F[centrifugal]:=-w &x (w &x r);

(5)

>	F[resultant]:=F[gravity]+F[Coriolis]+F[centrifugal];

(6)

>	eq:=(u,i)->simplify(diff(u(t),t,t)=F[resultant][i]):

>	xeq:=eq(x,1); yeq:=eq(y,2); zeq:=eq(z,3);

(7)

>	ic:=x(0)=0,y(0)=0,z(0)=0,D(x)(0)=0,D(y)(0)=V0cos(theta),D(z)(0)=V0sin(theta);

(8)

>	sol:=dsolve({xeq,yeq,zeq,ic},{x(t),y(t),z(t)},method=laplace):

>	assign(sol):

>	f:=u->simplify(expand(u(t))): X:=f(x); Y:=f(y); Z:=f(z);

(9)

>	P:=(u,n)->convert(taylor(u,W=0,n),polynom):

>	Xexp:=P(X,4); Yexp:=P(Y,4); Zexp:=P(Z,4);

Error, (in series/sum) unable to compute series

>	tt:=solve(Zexp=0,t);

(10)

>	T1:=P(tt[2],1); d[x]:=eval(Xexp,t=T1);

Error, invalid subscript selector

>	T2:=P(tt[2],2); d[y]:=P(eval(Yexp,t=T2),2);

Error, invalid subscript selector

>	d[y]:=collect(d[y],[cos(a),1/g^2,V0^3,W]);

(11)

>	parameters:={a=Pi/4,theta=Pi/3,V0=500,W=7.27*10^(-5),g=9.8}:

>	d[x]:=eval(d[x],evalf(parameters));

(12)

>	d[y]:=eval(d[y],evalf(parameters));

(13)

Download 05-2-2.mws

Maple conference 2026

Fri, 29 May 2026 22:30:18 Z

Can anyone share additional information about the Maple conference to be held in 2026? I want to submit a talk and then submit a paper to the Maple Transactions journal based on the same.

Cannot plot numerical ode

Ali Guzel — Fri, 29 May 2026 19:03:07 Z

Can anyone help me?

>	restart: with(plots):

>	h:=0.01: n:=6000: Digits:=18:

>	t[0]:=0: x[0]:=0.2: y[0]:=0.1: epsilon:=20:

>	F:=(x,y)->epsilon(1-x^2)y-x:

>	begin:=time():

>	for k from 0 to n do

>	t[k+1]:=t[k]+h;

>	x[k+1]:=x[k]+h*y[k];

>	y[k+1]:=y[k]+h*F(x[k],y[k]);

>	pt[k]:=[t[k],x[k],y[k]]:

end do:

>	cpu_time:=time()-begin;

>	pointplot3d([seq(pt[j],j=0..n)],axes=normal,symbol=cross,symbolsize=8,color=red,labels=["t","x","y"],orientation=[-90,0]);

>	sys:=diff(X(t),t)=Y(t),diff(Y(t),t)=F(X(t),Y(t));

>	vars:={X(t),Y(t)}: ic:=X(0)=0.2,Y(0)=0.1:

>	sol:=dsolve({sys,ic},vars,numeric,stepsize=h,method=classical[foreuler],output=listprocedure):

>	odeplot(sol,[t,X(t)],0..h*n,axes=normal,style=line,numpoints=n,labels=["t","x"]);

>	XX:=eval(X(t),sol): x1:=XX(1); pt[100];

Download 09-1-1.mws